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0001 0002 0003 Notes: hydrazine and vanadium 0004 0005 0006 ============================================================ 0007 FN ISI Export Format 0008 VR 1.0 0009 PT J 0010 AU Sarkar, A 0011 Pal, S 0012 AF Sarkar, Anindita 0013 Pal, Samudranil 0014 TI Some ternary complexes of oxovanadium(IV) with acetylacetone and 0015 N-(2-pyridyl)-N '-(salicylidene)hydrazine and its derivatives 0016 SO POLYHEDRON 0017 LA English 0018 DT Article 0019 DE oxovanadium(IV); ternary complexes; EPR spectra; crystal structures; 0020 self-assembly 0021 ID SCHIFF-BASE LIGAND; VANADIUM COMPLEXES; COORDINATION CHEMISTRY; VO2+ 0022 COMPLEXES; REDOX 0023 AB The reactions of one equivalent each of [VO(acac)(2)] and 0024 N-(2-pyridyl)-N'-(5-R-salicylidene)hydrazines (HphsalR) (derived front 0025 2-hydrazinopyridine and 5-substituted salicylaldehydes) in boiling 0026 acetonitrile under aerobic conditions provide ternary complexes of 0027 oxovanadium(IV) having the general formula [VO(phsalR)(acac)]. The 0028 complexes have been characterized by analytical, magnetic and 0029 spectroscopic measurements. The structures of two representative 0030 complexes have been determined by X-ray crystallography. In each 0031 structure, the metal centre is in a distorted octahedral N2O4 0032 coordination sphere. The tridentate phsalR(-) coordinates the metal ion 0033 via the pyridine-N, the imine-N and the phenolate-O atoms in a 0034 meridional fashion. The remaining three coordinations sites are 0035 occupied by the bidentate O,O-donor acetylacetonate (acac(-)) and the 0036 oxo group. In the crystal lattice, the molecules of each of the two 0037 complexes assemble to form one-dimensional supramolecular structure via 0038 intermolecular N-H center dot center dot center dot O=V hydrogen bond 0039 interaction. Electronic spectra collected using dimethylsulfoxide 0040 solutions of the complexes display a weak absorption within 643-720 nm 0041 due to d-d transition and some strong absorptions in the range 510-262 0042 nm due to ligand-to-metal charge transfer and ligand centred 0043 transitions. The room temperature (298 K) effective magnetic moments of 0044 the complexes in the solid state are consistent with an S = 1/2 ground 0045 state of the metal ion in each complex. All the complexes display axial 0046 EPR spectra with well-resolved V-51 hyperfine structure characteristic 0047 of an axially compressed octahedral coordination geometry around the 0048 metal centre. (C) 2005 Elsevier Ltd. All rights reserved. 0049 C1 Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh, India. 0050 RP Pal, S, Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh, 0051 India. 0052 EM spsc@uohyd.ernet.in 0053 NR 26 0054 TC 0 0055 PU PERGAMON-ELSEVIER SCIENCE LTD 0056 PI OXFORD 0057 PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND 0058 SN 0277-5387 0059 J9 POLYHEDRON 0060 JI Polyhedron 0061 PD MAY 8 0062 PY 2006 0063 VL 25 0064 IS 7 0065 BP 1689 0066 EP 1694 0067 PG 6 0068 SC Chemistry, Inorganic & Nuclear; Crystallography 0069 GA 045XJ 0070 UT ISI:000237775700028 0071 ER 0072 0073 0074 PT J 0075 AU Chu, WC 0076 Wu, CC 0077 Hsu, HF 0078 TI Catalytic reduction of hydrazine to ammonia by a vanadium thiolate 0079 complex 0080 SO INORGANIC CHEMISTRY 0081 LA English 0082 DT Article 0083 ID BIOLOGICAL NITROGEN-FIXATION; N-N BOND; DINITROGEN FIXATION; DIRECT 0084 INVOLVEMENT; POSSIBLE RELEVANCE; DIVALENT VANADIUM; LIGAND; CLEAVAGE; 0085 DISPROPORTIONATION; INTERMEDIATE 0086 AB Vanadium(III) thiolate complexes, [V(PS3")(Cl)]- [1a; PS3" = 0087 P(C6H3-3-(MeSi)-Si-3-2-S)(3)(3-)] and [V(PS3')(Cl)]- [1b; PS3' = 0088 P(C6H3-5-Me-2-S)3(3-)], were synthesized and characterized. Complex la 0089 serves as a precursor for the catalytic reduction of hydrazine to 0090 ammonia. The spectroscopic and electrochemical studies indicate that 0091 hydrazine is bound and activated in a V-II state. 0092 C1 Natl Cheng Kung Univ, Dept Chem, Tainan 701, Taiwan. 0093 RP Hsu, HF, Natl Cheng Kung Univ, Dept Chem, Tainan 701, Taiwan. 0094 EM konopka@mail.ncku.edu.tw 0095 NR 29 0096 TC 0 0097 PU AMER CHEMICAL SOC 0098 PI WASHINGTON 0099 PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 0100 SN 0020-1669 0101 J9 INORG CHEM 0102 JI Inorg. Chem. 0103 PD APR 17 0104 PY 2006 0105 VL 45 0106 IS 8 0107 BP 3164 0108 EP 3166 0109 PG 3 0110 SC Chemistry, Inorganic & Nuclear 0111 GA 034WJ 0112 UT ISI:000236961000009 0113 ER 0114 0115 0116 PT J 0117 AU Baunemann, A 0118 Kim, Y 0119 Winter, M 0120 Fischer, RA 0121 TI Mixed hydrazido amido/imido complexes of tantalum, hafnium and 0122 zirconium: potential precursors for metal nitride MOCVD 0123 SO DALTON TRANSACTIONS 0124 LA English 0125 DT Article 0126 ID CHEMICAL-VAPOR-DEPOSITION; SINGLE-SOURCE PRECURSORS; THIN-FILMS; 0127 ORGANOIMIDO COMPLEXES; GATE-ELECTRODE; NIOBIUM; TITANIUM; BEHAVIOR; 0128 VANADIUM; CRYSTAL 0129 AB The coordination chemistry of the hydrazine derivatives 0130 dimethylhydrazine (Hdmh) and N-trimethylsilyl-N'N'-dimethylhydrazine 0131 (Htdmh) at Ta, Zr and Hf was investigated aiming at volatile mixed 0132 ligand all-nitrogen coordinated compounds. The hydrazido ligands were 0133 introduced either by salt metathesis employing the Li salts of the 0134 hydrazines and the tetrachlorides MCl4 (M = Zr, Hf) or by amine 0135 substitution using M(NR2)(4) (R = Me, Et) and [(t-BuN)Ta(NR2)(3)]. The 0136 new complexes were fully characterised including H-1/C-13 NMR, mass 0137 spectrometry and a study of their thermal behaviour. The crystal 0138 structures of [ZrCl(tdmh)(3)] and the all-nitrogen coordinated complex 0139 [Ta(N-t-Bu)(NMe2)(2)-(tdmh)] are discussed as well as the structure of 0140 the by-product [Li(tdmh)(py)](2). Preliminary MOCVD experiments of the 0141 liquid compound [Ta(NEt2)(2)(N-t-Bu)(tdmh)] were performed and the 0142 deposited TaN(Si) films were analysed by RBS and SEM. 0143 C1 Ruhr Univ Bochum, Lehrstuhl Anorgan Chem Organomet & Mat Chem 2, D-4630 Bochum, Germany. 0144 RP Fischer, RA, Ruhr Univ Bochum, Lehrstuhl Anorgan Chem Organomet & Mat 0145 Chem 2, Univ Str 150, D-4630 Bochum, Germany. 0146 EM roland.fischer@ruhr-uni-bochum.de 0147 NR 34 0148 TC 1 0149 PU ROYAL SOC CHEMISTRY 0150 PI CAMBRIDGE 0151 PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, 0152 ENGLAND 0153 SN 1477-9226 0154 J9 DALTON TRANS 0155 JI Dalton Trans. 0156 PY 2006 0157 IS 1 0158 BP 121 0159 EP 128 0160 PG 8 0161 SC Chemistry, Inorganic & Nuclear 0162 GA 993PU 0163 UT ISI:000233968200013 0164 ER 0165 0166 0167 PT J 0168 AU Tripathi, VS 0169 Manjanna, J 0170 Venkateswaran, G 0171 Gokhale, BK 0172 Balaji, V 0173 TI Electrolytic preparation of vanadium(II) formate in pilot-plant scale 0174 using stainless steel mesh electrodes: Dissolution of 0175 alpha-Fe2O3/Fe1.6Cr0.4O3 in an aqueous V-II-NTA complex 0176 SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 0177 LA English 0178 DT Article 0179 ID SUBSTITUTED IRON-OXIDES; CARBON-PASTE ELECTRODE; DECONTAMINATION; ION 0180 AB The chemical formulations containing strong reducing agents such as 0181 V(II) are kinetically effective for the reductive dissolution of iron 0182 oxides such as Fe3O4, Fe2O3, etc. To develop a methodology for 0183 large-scale synthesis of V(II), we report here the details of an 0184 electrolytic preparation on a pilot-plant scale (50 L). It is 0185 demonstrated that, by using stainless steel mesh cathode and anode in a 0186 poly(tetrafluoroethylene)-lined stainless steel tank, V(II) could be 0187 prepared. To minimize the electrolysis duration for the conversion of 0188 V(V) to V(II), laboratory studies are carried out for a preliminary 0189 reduction of V(V) to V(IV) with hydrazine or ascorbic acid and then 0190 employing V(IV) for electrolysis. Here, the use of hydrazine was 0191 advantageous (30% less time) over that of ascorbic acid. The V(II) 0192 obtained was complexed with nitrilotriacetic acid (NTA), and its 0193 stability and dissolution kinetics of Fe2O3 and Fe1.6Cr04O3 in the 0194 V-II-NTA formulation are reported. 0195 C1 Bhabha Atom Res Ctr, Div Appl Chem, Bombay 400085, Maharashtra, India. 0196 RP Venkateswaran, G, Bhabha Atom Res Ctr, Div Appl Chem, Bombay 400085, 0197 Maharashtra, India. 0198 EM gvenk@magnum.barc.ernet.in 0199 NR 24 0200 TC 1 0201 PU AMER CHEMICAL SOC 0202 PI WASHINGTON 0203 PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 0204 SN 0888-5885 0205 J9 IND ENG CHEM RES 0206 JI Ind. Eng. Chem. Res. 0207 PD SEP 15 0208 PY 2004 0209 VL 43 0210 IS 19 0211 BP 5989 0212 EP 5995 0213 PG 7 0214 SC Engineering, Chemical 0215 GA 853DT 0216 UT ISI:000223807400003 0217 ER 0218 0219 0220 PT J 0221 AU Tanaka, N 0222 Wever, R 0223 TI Inhibition of vanadium chloroperoxidase from the fungus Curvularia 0224 inaequalis by hydroxylamine, hydrazine and azide and inactivation by 0225 phosphate 0226 SO JOURNAL OF INORGANIC BIOCHEMISTRY 0227 LA English 0228 DT Article 0229 DE vanadium chloroperoxidase; peroxo intermediate; hydrogen peroxide; 0230 azide; hydrazine; hydroxylamine; phosphate; inhibition; inactivation 0231 ID CONTAINING ENZYME CHLOROPEROXIDASE; ACTIVE-SITE MUTANTS; 0232 ASCOPHYLLUM-NODOSUM; CRYSTAL-STRUCTURE; BROMOPEROXIDASE; VANADATE; 0233 STATE; BIS(N,N-DIMETHYLHYDROXAMIDO)HYDROXOOXOVANADATE; PEROXIDASES; 0234 MECHANISM 0235 AB The first detailed inhibition study of recombinant vanadium 0236 chloroperoxidase (rVCPO) using hydroxylamine, hydrazine and azide has 0237 been carried out. Hydroxylamine inhibits rVCPO both competitively and 0238 uncompetitively. The competitive inhibition constant K-ic and the 0239 uncompetitive inhibition constant K-iu are 40 and 80 muM, respectively. 0240 The kinetic data suggest that rVCPO may form a hydroxylamido complex, 0241 hydroxylamine also seems to react with the peroxovanadate complex 0242 during turnover. The kinetic data show that the type of inhibition for 0243 hydrazine and azide is uncompetitive with the uncompetitive inhibition 0244 constant K-iu of 350 muM and 50 nM, respectively, showing that in 0245 particular azide is a very potent inhibitor of this enzyme. 0246 Substitution of vanadate in the active site by phosphate also leads to 0247 inactivation of vanadium chloroperoxidase. However, the presence of 0248 H2O2 clearly prevents the inactivation of the enzyme by phosphate. This 0249 shows that pervanadate is bound much more strongly to the enzyme than 0250 vanadate. (C) 2004 Elsevier Inc. All rights reserved. 0251 C1 Univ Amsterdam, Inst Mol Chem, NL-1018 WS Amsterdam, Netherlands. 0252 RP Wever, R, Univ Amsterdam, Inst Mol Chem, Nieuwe Achtergracht 129, 0253 NL-1018 WS Amsterdam, Netherlands. 0254 EM rwever@science.uva.nl 0255 NR 26 0256 TC 1 0257 PU ELSEVIER SCIENCE INC 0258 PI NEW YORK 0259 PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA 0260 SN 0162-0134 0261 J9 J INORG BIOCHEM 0262 JI J. Inorg. Biochem. 0263 PD APR 0264 PY 2004 0265 VL 98 0266 IS 4 0267 BP 625 0268 EP 631 0269 PG 7 0270 SC Biochemistry & Molecular Biology; Chemistry, Inorganic & Nuclear 0271 GA 811KB 0272 UT ISI:000220769700009 0273 ER 0274 0275 0276 PT J 0277 AU Jiang, Y 0278 Wu, Y 0279 Xie, B 0280 Zhang, SY 0281 Qian, YT 0282 TI Room temperature preparation of novel Cu2-xSe nanotubes in organic 0283 solvent 0284 SO NANOTECHNOLOGY 0285 LA English 0286 DT Article 0287 ID FULLERENE-LIKE STRUCTURES; THIN-FILMS; NANOCRYSTALLINE CU2-XSE; SILICA 0288 NANOTUBES; VANADIUM-OXIDE; GOLD NANOWIRES; SEMICONDUCTOR; 0289 NANOPARTICLES; MICROTUBES; CONVENIENT 0290 AB A compound with a non-layered structure composed of Cu2-xSe nanotubes 0291 was prepared in a room temperature redox reaction in ethylene diamine 0292 solution. The product was characterized by x-ray diffractometry, 0293 transmission electron microscopy, high resolution transmission electron 0294 microscopy, and x-ray photoelectron spectroscopy. Analysis shows that 0295 the nanotubes have a multiwall structure with (002) planes of 0296 face-centred cubic Cu2-xSe and open ends. The Cu2-xSe nanotubes have 0297 length 500 nm, with an inner diameter of 20 nm and an outer diameter of 0298 30 nm on average. Ethylene diamine's ability to achieve strong 0299 coordination and the presence of the reducing agent hydrazine hydrate 0300 aid the formation of Cu2-xSe nanotubes with mixed valence. 0301 C1 Hefei Univ Technol, Dept Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China. 0302 Univ Sci & Technol China, Dept Chem, Anhua 230026, Peoples R China. 0303 Univ Sci & Technol China, Struct Res Lab, Hefei 230009, Anhui, Peoples R China. 0304 RP Jiang, Y, Hefei Univ Technol, Dept Mat Sci & Engn, Hefei 230009, Anhui, 0305 Peoples R China. 0306 EM apjiang2002@yahoo.com 0307 ytqian@ustc.edu.cn 0308 NR 43 0309 TC 0 0310 PU IOP PUBLISHING LTD 0311 PI BRISTOL 0312 PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND 0313 SN 0957-4484 0314 J9 NANOTECHNOL 0315 JI Nanotechnology 0316 PD MAR 0317 PY 2004 0318 VL 15 0319 IS 3 0320 BP 283 0321 EP 286 0322 PG 4 0323 SC Engineering, Multidisciplinary; Nanoscience & Nanotechnology; Materials 0324 Science, Multidisciplinary; Physics, Applied 0325 GA 807VW 0326 UT ISI:000220530000012 0327 ER 0328 0329 0330 PT J 0331 AU Kanna, PS 0332 Mahendrakumar, CB 0333 Chatterjee, M 0334 Hemalatha, P 0335 Datta, S 0336 Chakraborty, P 0337 TI Vanadium inhibits placental glutathione S-transferase (GST-P) positive 0338 foci in 1,2-dimethyl hydrazine induced rat colon carcinogenesis 0339 SO JOURNAL OF BIOCHEMICAL AND MOLECULAR TOXICOLOGY 0340 LA English 0341 DT Article 0342 DE vanadium; 1,2-dimethyl hydrazine (1,2-DMH); glutathione S-Transferase 0343 (GST-P); aberrant crypt foci (ACF); super oxide dismutase (SOD) 0344 ID ABERRANT CRYPT FOCI; LIVER CARCINOGENESIS; SUPEROXIDE-DISMUTASE; 0345 CANCER; DIETHYLNITROSAMINE; CHEMOPREVENTION; PROSPECTS; ENZYMES 0346 AB Vanadium (V) has recently been found to possess potent anti-neoplastic 0347 Activity in rat colon carcinogenesis. In the present study attempts 0348 have been made to investigate the expression of the number and area of 0349 aberrant crypt foci positive for placental glutathione S-transferase 0350 (GST-P) during 1,2-dimethyl hydrazine (DMH)-induced rat colon 0351 carcinogenesis. Male Sprague Dawley rats were randomly divided into 0352 four groups. Rats in group A were designed as normal controls. Group B 0353 animals received DMH once a week (20 mg/kg body wt.) intraperitoneally 0354 for 16 weeks. Group C rats received the same treatment of DMH as in 0355 group B, along with 0.5-ppm vanadium as ammonium monovanadate ad 0356 libitum in drinking water throughout the experiment. Vanadium alone was 0357 given to Group D rats without any DMH. injection. The expression of the 0358 number and the area of aberrant crypt foci (ACF) positive for GST-P was 0359 maximum in DMH-treated group. Vanadium-treated rats significantly 0360 reduced (P < 0.001) the expression of GST-P positive ACF cells (by 0361 71.13%) for the entire period of the study, Moreover the 0362 histopathological examination also showed that vanadium action could 0363 minimize the aberrant crypt foci (P < 0.001). Furthermore, vanadium 0364 supplementation also elevated SOD activities in both liver and colon (P 0365 < 0.01, P < 0.02 and P < 0.01, P < 0.02 respectively) when compared to 0366 their carcinogen counterparts. Our results confirm that vanadium is 0367 particularly effective in limiting the action of the carcinogen, 0368 thereby establishing its anticarcinogenicity in chemically induced rat 0369 colon carcinogenesis. (C) 2003 Wiley Periodicals, Inc. 0370 C1 Jadavpur Univ, Dept Pharmaceut Technol, Div Biochem, Calcutta 700032, W Bengal, India. 0371 RP Chatterjee, M, Jadavpur Univ, Dept Pharmaceut Technol, Div Biochem, 0372 Calcutta 700032, W Bengal, India. 0373 NR 42 0374 TC 0 0375 PU JOHN WILEY & SONS INC 0376 PI HOBOKEN 0377 PA 111 RIVER ST, HOBOKEN, NJ 07030 USA 0378 SN 1095-6670 0379 J9 J BIOCHEM MOL TOXICOL 0380 JI J. Biochem. Mol. Toxicol. 0381 PY 2003 0382 VL 17 0383 IS 6 0384 BP 357 0385 EP 365 0386 PG 9 0387 SC Biochemistry & Molecular Biology; Toxicology 0388 GA 758UJ 0389 UT ISI:000187668500007 0390 ER 0391 0392 0393 PT J 0394 AU Hsu, HF 0395 Chu, WC 0396 Hung, CH 0397 Liao, JH 0398 TI The first example of a seven-coordinate Vanadium(III) thiolate complex 0399 containing the hydrazine molecule, an intermediate of nitrogen fixation 0400 SO INORGANIC CHEMISTRY 0401 LA English 0402 DT Article 0403 ID CRYSTAL-STRUCTURE; V(III) COMPLEXES; LIGAND; DISULFIDE; RELEVANT 0404 AB The first example of a seven-coordinate vanadium(III) thiolate complex, 0405 [V(PS3")(N2H4)(3)] (1), where PS3" = [P(C6H3-3-Me3Si-2-S)(3)](3-), has 0406 been synthesized and characterized. Compound 1 contains a tetradentate 0407 ligand (PS3") and three hydrazine molecules, forming a capped 0408 octahedral geometry. A five-coordinate vanadium(III) complex, 0409 [V(PS3)(1-Me-lm)] (2), where PS3 = [P(C6H4-2-S)(3)](3-) and 1-Me-Im = 0410 1-methyl-imidazole, was also obtained. Compound 2 adopts a trigonal 0411 bipyramidal geometry, in which the vanadium is ligated by the title 0412 ligand, PS3, and one 1-Me-lm molecule. 0413 C1 Natl Cheng Kung Univ, Dept Chem, Tainan 701, Taiwan. 0414 Natl Changhua Univ Educ, Changhua, Taiwan. 0415 Natl Chung Cheng Univ, Chiayi 62117, Taiwan. 0416 RP Hsu, HF, Natl Cheng Kung Univ, Dept Chem, Tainan 701, Taiwan. 0417 NR 22 0418 TC 5 0419 PU AMER CHEMICAL SOC 0420 PI WASHINGTON 0421 PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 0422 SN 0020-1669 0423 J9 INORG CHEM 0424 JI Inorg. Chem. 0425 PD NOV 17 0426 PY 2003 0427 VL 42 0428 IS 23 0429 BP 7369 0430 EP 7371 0431 PG 3 0432 SC Chemistry, Inorganic & Nuclear 0433 GA 743FZ 0434 UT ISI:000186562900011 0435 ER 0436 0437 0438 PT J 0439 AU Kanna, PS 0440 Mahendrakumar, CB 0441 Chakraborty, T 0442 Hemalatha, P 0443 Banerjee, P 0444 Chatterjee, M 0445 TI Effect of vanadium on colonic aberrant crypt foci induced in rats by 0446 1,2 Dimethyl hydrazine 0447 SO WORLD JOURNAL OF GASTROENTEROLOGY 0448 LA English 0449 DT Article 0450 ID PUTATIVE PRENEOPLASTIC LESIONS; S-TRANSFERASE ACTIVITY; 0451 CELL-PROLIFERATION; DIETARY ANTIOXIDANTS; COLORECTAL-CANCER; 0452 CARCINOGENESIS; ENZYMES; EXPRESSION; 1,2-DIMETHYLHYDRAZINE; DETOXICATION 0453 AB AIM: To investigate the chemo preventive effects of vanadium on rat 0454 colorectal carcinogenesis induced by 1,2-dimethylhydrazine (DMH). 0455 METHODS: Male Sprague-Dawley Rats were randomly divided into four 0456 groups. Rats in Group A received saline vehicle alone for 16 weeks. 0457 Rats in Group B were given DMH injection once a week intraperitoneally 0458 for 16 weeks; rats in Group C, with the same DMH treatment as in the 0459 Group 13, but received 0.5-ppm vanadium in the form ammonium 0460 monovanadate ad libitum in drinking water. Rats in the Group D received 0461 vanadium alone as in the Group C without DMH injection. 0462 RESULTS: Aberrant crypt foci (ACF) were formed in animals in 0463 DMH-treated groups at the end of week 16. Compared to DMH group, 0464 vanadium treated group had less ACF (P<0.001). At the end of week 32, 0465 all rats in DMH group developed large intestinal tumors. Rats treated 0466 with vanadium contained significantly few colonic adenomas and 0467 carcinomas (P<0.05) compared to rats administered DMH only. In 0468 addition, a significant reduction (P<0.05) in colon tumor burden (sum 0469 of tumor sizes per animal) was also evident in animals of Group C when 0470 compared to those in rats of carcinogen control Group B. The results 0471 also showed that vanadium significantly lowered PCNA index in ACF 0472 (P<0.005). Furthermore, vanadium supplementation also elevated liver 0473 GST and Cyt P-450 activities (P<0.001 and P<0.02, respectively). 0474 CONCLUSION: Vanadium in the form of ammonium monovanadate supplemented 0475 in drinking water ad libitum has been found to be highly effective in 0476 reducing tumor incidence and preneoplastic foci on DMH-induced 0477 colorectal carcinogenesis. These findings suggest that vanadium 0478 administration can suppress colon carcinogenesis in rats. 0479 C1 Jadavpur Univ, Div Biochem, Dept Pharmaceut Technol, Calcutta 700032, W Bengal, India. 0480 RP Chatterjee, M, Jadavpur Univ, Div Biochem, Dept Pharmaceut Technol, PO 0481 17028, Calcutta 700032, W Bengal, India. 0482 NR 52 0483 TC 5 0484 PU W J G PRESS 0485 PI BEIJING 0486 PA PO BOX 2345, BEIJING 100023, PEOPLES R CHINA 0487 SN 1007-9327 0488 J9 WORLD J GASTROENTEROL 0489 JI World J. Gastroenterol. 0490 PD MAY 0491 PY 2003 0492 VL 9 0493 IS 5 0494 BP 1020 0495 EP 1027 0496 PG 8 0497 SC Gastroenterology & Hepatology 0498 GA 681ML 0499 UT ISI:000183039900026 0500 ER 0501 0502 0503 PT J 0504 AU Lisnard, L 0505 Mialane, P 0506 Dolbecq, A 0507 Marrot, J 0508 Secheresse, F 0509 TI A tetranuclear oxomolybdenum(V) complex with bridging squarate ligands, 0510 [(Mo4O8)-O-V(OH)(2)(H2O)(2)(C4O4)(2)](2-) 0511 SO INORGANIC CHEMISTRY COMMUNICATIONS 0512 LA English 0513 DT Article 0514 DE polyoxometalate; squarate ligands; crystal structure; molybdenum 0515 ID COORDINATION CHEMISTRY; POLYOXOMOLYBDATES; MOLYBDENUM; VANADIUM 0516 AB The new tetranuclear polyoxomolybdate(V) ion 0517 [(Mo4O8)-O-V(OH)(2)(H2O)(2)(C4O4)(2)](2-) has been obtained in one step 0518 by the reaction of sodium molybdate, hydrazine and squaric acid in 0519 water and crystallized as a potassium salt. The structure has been 0520 solved by single-crystal X-ray diffraction showing the location of the 0521 hydroxo and water molecule ligands. (C) 2003 Elsevier Science B.V. All 0522 rights reserved. 0523 C1 Univ Versailles St Quentin, IREM, Ins Lavoisier, UMR C 0173, F-78035 Versailles, France. 0524 RP Dolbecq, A, Univ Versailles St Quentin, IREM, Ins Lavoisier, UMR C 0525 0173, 45 Ave Etats Unis, F-78035 Versailles, France. 0526 NR 16 0527 TC 6 0528 PU ELSEVIER SCIENCE BV 0529 PI AMSTERDAM 0530 PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS 0531 SN 1387-7003 0532 J9 INORG CHEM COMMUN 0533 JI Inorg. Chem. Commun. 0534 PD MAY 0535 PY 2003 0536 VL 6 0537 IS 5 0538 BP 503 0539 EP 505 0540 PG 3 0541 SC Chemistry, Inorganic & Nuclear 0542 GA 661BL 0543 UT ISI:000181871300018 0544 ER 0545 0546 0547 PT J 0548 AU Brayner, R 0549 Bozon-Verduraz, F 0550 TI Niobium pentoxide prepared by soft chemical routes: morphology, 0551 structure, defects and quantum size effect 0552 SO PHYSICAL CHEMISTRY CHEMICAL PHYSICS 0553 LA English 0554 DT Article 0555 ID VANADIUM-OXIDE CATALYSTS; RAMAN-SPECTRA; SURFACE-STRUCTURES; 0556 SPECTROSCOPY; OXIDATION; CDS; PHOTOCHEMISTRY; HYDROGENATION; 0557 SUSPENSIONS; REACTIVITY 0558 AB Niobium pentoxide (Nb2O5) is prepared by soft chemical routes 0559 (digestion either in ammonia or in hydrazine solutions) and is compared 0560 to a commercial sample. According to various characterization methods 0561 (XRD, HRTEM, DTA-TG, UV-visible diffuse reflectance, Raman and EPR 0562 spectroscopies), Nb2O5 shows particular bulk and surface properties. 0563 The phase transformation temperatures (amorphous --> pseudo-hexagonal, 0564 pseudo-hexagonal --> orthorhombic and orthorhombic --> monoclinic) for 0565 the synthetic Nb2O5 are about 100-150degreesC higher than for the 0566 commercial sample. The textural properties depend strongly on the 0567 preparation method. After calcination at 400degreesC, the sample 0568 prepared in ammonia has a larger pore volume (0.22 cm(3) g(-1)) and a 0569 better resistance to sintering at 600degreesC. The preparation in 0570 hydrazine gives the following advantages only if the gel is sonically 0571 redispersed in ethanol: low particle size, narrow size distribution, 0572 and higher resistance to sintering (140 m(2) g(-1) at 600degreesC). 0573 Preparation in ammonia or in hydrazine favors the formation of defects, 0574 characterized by a significant absorption in the visible range adjacent 0575 to the interband transition (3.4 eV, 360 nm). These defects, which 0576 disappear upon heating in oxygen, are identified as Nb4+ species and 0577 ionized oxygen vacancies as confirmed by EPR measurements. Finally, the 0578 nanoparticles obtained by sonication in ethanol (average particle size 0579 4.5 nm) shows a significant band gap increase ( from 3.4 eV to 4.2 eV) 0580 which is assigned to a quantum size effect. 0581 C1 Univ Paris 07, CNRS, Lab Chim Mat Divises & Catalyse, ITODYS,UMR 7086, F-75251 Paris 05, France. 0582 RP Bozon-Verduraz, F, Univ Paris 07, CNRS, Lab Chim Mat Divises & 0583 Catalyse, ITODYS,UMR 7086, Case 7090,Pl Jussieu, F-75251 Paris 05, 0584 France. 0585 NR 56 0586 TC 2 0587 PU ROYAL SOC CHEMISTRY 0588 PI CAMBRIDGE 0589 PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, 0590 ENGLAND 0591 SN 1463-9076 0592 J9 PHYS CHEM CHEM PHYS 0593 JI Phys. Chem. Chem. Phys. 0594 PY 2003 0595 VL 5 0596 IS 7 0597 BP 1457 0598 EP 1466 0599 PG 10 0600 SC Chemistry, Physical; Physics, Atomic, Molecular & Chemical 0601 GA 654YE 0602 UT ISI:000181523900018 0603 ER 0604 0605 0606 PT J 0607 AU Jiang, Y 0608 Xie, B 0609 Wu, J 0610 Yuan, SW 0611 Wu, Y 0612 Huang, H 0613 Qian, YT 0614 TI Room-temperature synthesis of copper and silver, nanocrystalline 0615 chalcogenides in mixed solvents 0616 SO JOURNAL OF SOLID STATE CHEMISTRY 0617 LA English 0618 DT Article 0619 ID FULLERENE-LIKE STRUCTURES; VANADIUM-OXIDE; METAL; MAGNETORESISTANCE; 0620 CONVENIENT; SELENIDES; NANOTUBES; FILMS; SE 0621 AB Copper and silver nanocrystalline chalcogenides, Cu2-xSe, Cu2Te, Ag2Se, 0622 and Ag2Te, have been successfully synthesized in a mixture of 0623 ethylenediamine and hydrazine hydrate as a solvent at room temperature. 0624 Products showed different morphologies, such as nanotubes, nanorods, 0625 and nanoparticles. The results indicated that the coordination and 0626 chelation abilities of ethylenediamine play an important role in the 0627 formation of one-dimensional nanocrystalline binary chalcogenides, and 0628 hydrazine hydrate is crucial to the electron transfer in the room 0629 temperature reactions. These transition-metal nanocrystalline 0630 chalcogenides as prepared were analyzed by X-ray powder diffraction, 0631 transmission electron microscopy, and X-ray photoelectron spectroscopy. 0632 The UV-Vis absorption properties of these nanocrystals were also 0633 measured. (C) 2002 Elsevier Science (USA). 0634 C1 Univ Sci & Technol China, Struct Res Lab, Hefei 230026, Anhui, Peoples R China. 0635 Univ Sci & Technol China, Dept Chem, Hefei 230026, Anhui, Peoples R China. 0636 Hefei Univ Technol, Inst Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China. 0637 RP Qian, YT, Univ Sci & Technol China, Struct Res Lab, Hefei 230026, 0638 Anhui, Peoples R China. 0639 NR 30 0640 TC 9 0641 PU ACADEMIC PRESS INC ELSEVIER SCIENCE 0642 PI SAN DIEGO 0643 PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA 0644 SN 0022-4596 0645 J9 J SOLID STATE CHEM 0646 JI J. Solid State Chem. 0647 PD AUG 0648 PY 2002 0649 VL 167 0650 IS 1 0651 BP 28 0652 EP 33 0653 PG 6 0654 SC Chemistry, Inorganic & Nuclear; Chemistry, Physical 0655 GA 592BA 0656 UT ISI:000177915800004 0657 ER 0658 0659 0660 PT J 0661 AU Davies, SC 0662 Hughes, DL 0663 Konkol, M 0664 Richards, RL 0665 Sanders, JR 0666 Sobota, P 0667 TI Synthesis, structure and chemistry of vanadium(IV) and vanadium(V) 0668 compounds with substituted hydrazido(1-) and hydrazido(2-) ligands 0669 SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS 0670 LA English 0671 DT Article 0672 ID CRYSTAL-STRUCTURES; CO-LIGANDS; DINITROGEN COMPLEXES; TUNGSTEN; 0673 N(CH2CH2S)(3)(3-); MOLYBDENUM; HYDRAZINE; OXIDE 0674 AB The reaction of [V(NS3)O] [NS3 = N(CH2CH2S)(3\)] with methylhydrazine 0675 gives the hydrazido(1-) vanadium() complex [V(NS3)(NMeNH2)] 1, but 0676 reaction with various other compounds containing N-N groups results in 0677 formation of compounds containing substituted hydrazido(2-) ligands. 0678 Structures of 1, [V(NS3)(NNC5H10)] 2 and [V(NS3)(NNCPh2)] 3 are 0679 described. 0680 C1 John Innes Ctr Plant Sci Res, Dept Biol Chem, Norwich NR4 7UH, Norfolk, England. 0681 Univ Wroclaw, Fac Chem, PL-50138 Wroclaw, Poland. 0682 Univ Sussex, Sch Chem Phys & Environm Sci, Brighton BN1 9QJ, E Sussex, England. 0683 RP Davies, SC, John Innes Ctr Plant Sci Res, Dept Biol Chem, Norwich NR4 0684 7UH, Norfolk, England. 0685 NR 17 0686 TC 1 0687 PU ROYAL SOC CHEMISTRY 0688 PI CAMBRIDGE 0689 PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, 0690 ENGLAND 0691 SN 1472-7773 0692 J9 J CHEM SOC DALTON TRANS 0693 JI J. Chem. Soc.-Dalton Trans. 0694 PY 2002 0695 IS 14 0696 BP 2811 0697 EP 2814 0698 PG 4 0699 SC Chemistry, Inorganic & Nuclear 0700 GA 573GY 0701 UT ISI:000176822000008 0702 ER 0703 0704 0705 PT J 0706 AU Zhang, HT 0707 Gui, Z 0708 Fan, R 0709 Chen, XH 0710 TI Hydrothermal synthesis and characterization of nanorods "LixV2-delta 0711 O4-delta center dot H2O" 0712 SO INORGANIC CHEMISTRY COMMUNICATIONS 0713 LA English 0714 DT Article 0715 DE hydrothermal synthesis; LixV2-delta O4-delta center dot H2O; nanorods; 0716 vanadium oxide 0717 ID RECHARGEABLE LITHIUM BATTERIES; CATHODE 0718 AB Nanorods "LixV2-deltaO4-delta . H2O" were hydrothermally synthesized 0719 with starting agents LiOH . H2O and V2O5, and reducing agent hydrazine 0720 monohydrate (NH2NH2 . H2O) under alkaline condition at 160 degreesC. 0721 The samples were characterizated by X-ray diffraction (XRD), 0722 transmission electron microscopy (TEM) and X-ray photoelectron 0723 spectroscopy (XPS). The nanorods obtained have diameters from 80 to 100 0724 nm with length up to several micrometers. Molecular coordination and 0725 assembly mechanism can be assumed to explain the formation of 0726 one-dimensional nanorods. (C) 2002 Elsevier Science B.V. All rights 0727 reserved. 0728 C1 Univ Sci & Technol China, Dept Phys, Struct Res Lab, Anhua 230026, Peoples R China. 0729 Univ Sci & Technol China, State Key Lab Fire Sci, Anhua 230026, Peoples R China. 0730 RP Chen, XH, Univ Sci & Technol China, Dept Phys, Struct Res Lab, Anhua 0731 230026, Peoples R China. 0732 NR 27 0733 TC 0 0734 PU ELSEVIER SCIENCE BV 0735 PI AMSTERDAM 0736 PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS 0737 SN 1387-7003 0738 J9 INORG CHEM COMMUN 0739 JI Inorg. Chem. Commun. 0740 PD JUN 0741 PY 2002 0742 VL 5 0743 IS 6 0744 BP 399 0745 EP 402 0746 PG 4 0747 SC Chemistry, Inorganic & Nuclear 0748 GA 564FV 0749 UT ISI:000176305100007 0750 ER 0751 0752 0753 PT J 0754 AU Xu, W 0755 Xue, CH 0756 TI Catalytic performance of fluidized-bed catalyst for oxidation of 0757 n-butane to maleic anhydride 0758 SO CHINESE JOURNAL OF CATALYSIS 0759 LA English 0760 DT Article 0761 DE n -butane; maleic anhydride; selective oxidation; fluidized-bed 0762 catalyst; hydrazine hydrate; vanadium pentoxide 0763 ID PHOSPHORUS OXIDE CATALYSTS; VANADYL PYROPHOSPHATE; SELECTIVE OXIDATION; 0764 VPO CATALYSTS; ACTIVE PHASE; MECHANISM 0765 AB The experiments of precursor preparation have been performed to 0766 investigate the effects of N2H4 . H2O/V2O5 mole ratio on catalytic 0767 performance of VPO catalyst for oxidation of n -butane to maleic 0768 anhydride (MA). For the catalyst samples prepared at higher mole ratio 0769 of N2H4 . H2O/V2O5, the quantity of (VO)(2)P2O7 (V4+) phase is 0770 considerably large, and the n -butane conversion is quite high. With 0771 the decrease of N2H4 . H2O/ V2O5 mole ratio in precursor preparation, 0772 the relative amount of delta-VOPO4,(V5+) phase increases progressively. 0773 The increase of V5+ phase strengthens the oxidation of the intermediate 0774 olefins, and then promotes the dehydrogenation of n -butane. Thus, the 0775 selectivity for MA increases at beginning, whereas the n -butane 0776 conversion increases continuously. When the V5+ phase reaches a given 0777 quantity, the overoxidation takes place, and the selectivity for MA 0778 begins to decrease. The yield of MA goes through a Maximum value at the 0779 optimal N2H4 . H2O/ V2.O5 mole ratio during the change of N2H4 . 0780 H2O/V2O5 mole ratio in precursor preparation from high to low. The 0781 catalyst sample prepared at N2H4 . H2O/V2O5 Mole ratio of 0.34 gave the 0782 maximum MA yield of 49.74% under the conditions of n -butane 0783 concentration of 4.0%, space velocity of 500 h(-1) and temperature of 0784 420degreesC. The catalyst of fine particle bed in this study belongs to 0785 the particles of group A. The catalyst fluidizes easily and behaves a 0786 larger flexibility for operation. 0787 C1 Tianjin Univ, Sch Chem Engn, Tianjin 300072, Peoples R China. 0788 RP Xu, W, Tianjin Univ, Sch Chem Engn, Tianjin 300072, Peoples R China. 0789 NR 16 0790 TC 0 0791 PU SCIENCE CHINA PRESS 0792 PI BEIJING 0793 PA 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA 0794 SN 0253-9837 0795 J9 CHIN J CATAL 0796 JI Chin. J. Catal. 0797 PD MAY 0798 PY 2002 0799 VL 23 0800 IS 3 0801 BP 199 0802 EP 202 0803 PG 4 0804 SC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical 0805 GA 563CH 0806 UT ISI:000176236500003 0807 ER 0808 0809 0810 PT J 0811 AU Mohamed, AA 0812 Ahmed, SA 0813 El-Shahat, MF 0814 TI Catalytic spectrophotometric determination of molybdenum 0815 SO MONATSHEFTE FUR CHEMIE 0816 LA English 0817 DT Article 0818 DE molybdenum; catalytic determination; 2-aminophenol; hydrogen peroxide; 0819 redox reaction; natural and waste waters 0820 ID STRIPPING VOLTAMMETRIC DETERMINATION; ATOMIC-ABSORPTION SPECTROMETRY; 0821 HYDROGEN-PEROXIDE; HYDRAZINE DIHYDROCHLORIDE; TRACE AMOUNTS; TUNGSTEN; 0822 CHROMIUM; OXIDATION; VANADIUM; CHLORIDE 0823 AB A highly selective, sensitive, and simple catalytic method for the 0824 determination of molybdenum in natural and waste waters was developed. 0825 It is based on the catalytic effect of Mo(VI) on the oxidation of 0826 2-aminophenol with H2O2. The reaction is monitored 0827 spectrophotometrically,by tracing the oxidation product at 430 nm after 0828 10 min of mixing the reagents. Addition of 800 mug . cm(-3) EDTA 0829 conferred high selectivity; however, interfering effects of Au(III), 0830 Cr(III), Cr(VI), and Fe(III) had to be eliminated by a reduction and 0831 co-precipitation procedure with SnCl2 and Al(OH)(3). Mo(VI) shows a 0832 linear calibration graph up to 11.0 ng . cm(-3); the detection limit, 0833 based on the 3S(b)-criterion, is 0.10 ng . cm(-3). The unique 0834 selectivity and sensitivity of the new method allowed its direct 0835 application to the determination of Mo(VI) in natural and waste waters. 0836 C1 Ain Shams Univ, Fac Sci, Dept Chem, Cairo 11566, Egypt. 0837 RP Mohamed, AA, King Khalid Univ, Fac Sci, Dept Chem, Abha 9033, Saudi 0838 Arabia. 0839 NR 52 0840 TC 0 0841 PU SPRINGER-VERLAG WIEN 0842 PI VIENNA 0843 PA SACHSENPLATZ 4-6, PO BOX 89, A-1201 VIENNA, AUSTRIA 0844 SN 0026-9247 0845 J9 MONATSH CHEM 0846 JI Mon. Chem. 0847 PD JAN 0848 PY 2002 0849 VL 133 0850 IS 1 0851 BP 31 0852 EP 40 0853 PG 10 0854 SC Chemistry, Multidisciplinary 0855 GA 514VJ 0856 UT ISI:000173461500004 0857 ER 0858 0859 0860 PT J 0861 AU Ramababu, G 0862 Rao, PVS 0863 Ramakrishna, K 0864 Syamala, P 0865 Satyanarayana, A 0866 TI Oxidation of hydrazine and hydroxylamine by vanadium(V) under the 0867 conditions where VO2+ and decavanadates coexist 0868 SO JOURNAL OF THE INDIAN CHEMICAL SOCIETY 0869 LA English 0870 DT Article 0871 ID SULFURIC-ACID MEDIUM 0872 AB The kinetics of oxidation of hydrazine and hydroxylamine have been 0873 investigated in the pH range 3.1-4.3. Both the oxidations obey first 0874 order kinetics with respect to the reductant, but the rate has very 0875 little dependence on [V-V](t). The reactions are accelerated by H+ ion 0876 but the dependence of rate on [H+] is less than that corresponding to 0877 first order dependence. Under these conditions, the species, VO2+ is in 0878 equilibrium with decavanadate ions and the equilibrium accounts for the 0879 different kinetic pattern observed in this pH range. 0880 C1 Andhra Univ, Sch Chem, Visakhapatnam 530003, Andhra Pradesh, India. 0881 RP Rao, PVS, Andhra Univ, Sch Chem, Visakhapatnam 530003, Andhra Pradesh, 0882 India. 0883 NR 19 0884 TC 4 0885 PU INDIAN CHEMICAL SOC 0886 PI CALCUTTA 0887 PA 92 ACHARYA PRAFULLA CHANDRA RD ATTN:DR INDRAJIT KAR/EXEC SEC, CALCUTTA 0888 700009, INDIA 0889 SN 0019-4522 0890 J9 J INDIAN CHEM SOC 0891 JI J. Indian Chem. Soc. 0892 PD MAY 0893 PY 2001 0894 VL 78 0895 IS 5 0896 BP 237 0897 EP 240 0898 PG 4 0899 SC Chemistry, Multidisciplinary 0900 GA 441WB 0901 UT ISI:000169251600005 0902 ER 0903 0904 0905 PT J 0906 AU Pal, S 0907 Pal, S 0908 TI A dimeric pervanadyl (VO2+) complex with a tridentate Schiff base ligand 0909 SO JOURNAL OF CHEMICAL CRYSTALLOGRAPHY 0910 LA English 0911 DT Article 0912 DE pervanadyl complex; Schiff base; di(mu-oxo)-bridged dimer; crystal 0913 structure 0914 ID CRYSTAL-STRUCTURE; VANADIUM(V); CHEMISTRY 0915 AB A di(mu -oxo)-bridged dinuclear complex, [VO2(pamh)](2) was isolated by 0916 reacting bis(acetylacetonato)vanadium(IV) and the Schiff base, 0917 N-(anisoyl)-N'-(picolinylidene)-hydrazine (Hpamh) in acetonitrile. The 0918 complex crystallizes in the space group P (1) over bar (#2) on 0919 crystallographic inversion center. Crystal data: a = 8.2202(12) 0920 Angstrom, b = 9.8389(19) Angstrom ,c = 10.1907(17) Angstrom, alpha = 0921 68.245(15)degrees, beta = 74.47(2)degrees, gamma = 66.710(19)degrees, V 0922 = 696.0(2) Angstrom (3), and Z = 1. The physical properties of the 0923 complex and the structural parameters are consistent with the +5 0924 oxidation state of the metal ions. The monomeric VO2(pamh) unit is 0925 square-pyramidal. The planar mononegative ligand (pamh(-)) coordinates 0926 the metal ion via the pyridine-N, the imine-N, and the amide-O atoms. 0927 One of the oxo groups completes the NNOO basal plane and also 0928 participates in the V-O-V bridge formation. The other oxo group 0929 satisfies the fifth apical coordination site. The molecular structure 0930 of the dimeric complex, [VO2(pamh)](2) can be described as two 0931 edge-shared distorted VO4N2 octahedra. 0932 C1 Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh, India. 0933 RP Pal, S, Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh, 0934 India. 0935 NR 22 0936 TC 6 0937 PU KLUWER ACADEMIC/PLENUM PUBL 0938 PI NEW YORK 0939 PA 233 SPRING ST, NEW YORK, NY 10013 USA 0940 SN 1074-1542 0941 J9 J CHEM CRYSTALLOGRAPHY 0942 JI J. Chem. Crystallogr. 0943 PD MAY 0944 PY 2000 0945 VL 30 0946 IS 5 0947 BP 329 0948 EP 333 0949 PG 5 0950 SC Crystallography; Spectroscopy 0951 GA 431CJ 0952 UT ISI:000168614100006 0953 ER 0954 0955 0956 PT J 0957 AU Davies, SC 0958 Hughes, DL 0959 Janas, Z 0960 Jerzykiewicz, LB 0961 Richards, RL 0962 Sanders, JR 0963 Silverston, JE 0964 Sobota, P 0965 TI Vanadium complexes of the N(CH2CH2S)(3)(3-) and O(CH2CH2S)(2)(2-) 0966 ligands with coligands relevant to nitrogen fixation processes 0967 SO INORGANIC CHEMISTRY 0968 LA English 0969 DT Article 0970 ID RAY CRYSTAL-STRUCTURES; MOLECULAR-STRUCTURE; DINITROGEN FIXATION; 0971 MOLYBDENUM; HYDRAZINE; CHEMISTRY; REDUCTION; IMIDO; TUNGSTEN; AMMONIA 0972 AB Vanadium(III) and vanadium(V) complexes derived from the 0973 tris(2-thiolatoethyl)amine ligand [(NS3)(3-)] and the 0974 bis(2-thiolatoethyl)ether ligand [(OS2)(2-)] have been synthesized with 0975 the aim of investigating the potential of these vanadium sites to bind 0976 dinitrogen and activate its reduction. Evidence is presented for the 0977 transient existence of {V(NS3)(N-2)V(NS3)}, and a series of mononuclear 0978 complexes containing hydrazine, hydrazide, imide, ammine, organic 0979 cyanide, and isocyanide ligands has been prepared and the chemistry of 0980 these complexes investigated. [V(NS3)O] (1) reacts with an excess of 0981 N2H4 to give, probably via the intermediates {V(NS3)(NNH2)} (2a) and 0982 {V(NS3)(N-2)V(NS3)} (3), the V-III adduct [{V(NS3)(N2H4)}] (4). If 1 is 0983 treated with 0.5 mol of N2H4, 0.5 mol of N-2 is evolved and green, 0984 insoluble [{V(NS3)}(n)] (5) results. Compound 4 is converted by 0985 disproportionation to [V(NS3)-(NH3)- (NH3)](6), but 4 does not act as a 0986 catalyst for disproportionation of N2H4 nor does it act as a catalyst 0987 for its reduction by Zn/HOC6H3Pr2i-2,6. Compound 1 reacts with 0988 (NR2NR22)-N-1 (R-1 = H or SiMe3; R-2(2) = Me-2, MePh, or HPh) to give 0989 the hydrazide complexes [V(NS3)(NNR22)] (R-2(2) = Me-2, 2b; R-2(2) = 0990 MePh, 2c; R-2(2) HPh, 2d), which are not protonated by anhydrous HBr 0991 nor are they reduced by Zn/HOC6H3Pri2-2,6. Compound 2b can also be 0992 prepared by reaction of [V(NNMe2)(dipp)(3)] (dipp = OC6H3Pr2i-2,6) with 0993 NS3H3. N2H4 is displaced quantitatively from 4 by anions to give the 0994 salts [NR43][V(NS3)X] (X = Cl, R-3 = Et, 7a; X = Cl. R-3 = Ph, 7b; X = 0995 Br, R-3 = Et, 7c; X = N-3, R-3 = Bu-n, 7d; X = N-3, R-3 = Et, 7e; X = 0996 CN, R-3 = Et, 7f). Compound 6 loses NH3 thermally to give 5, which can 0997 also be prepared from [VCl3(THF)(3)] and NS3H3/LiBun. Displacement of 0998 NH3 from 6 by ligands L gives the adducts [V(NS3)(L)] (L = MeCN, nu(CN) 0999 2264 cm(-1), 8a; L = (BuNC)-N-t, nu(NC) 2173 cm(-1), 8b; L = C6H11NC. 1000 nu(NC) 2173 cm(-1), 8c). Reaction of 4 with N3SiMe3 gives 1001 [V(NS3)(NSiMe3)] (9), which is converted to [V(NS3)(NH)] (10) by 1002 hydrolysis and to [V(NS3)(NCPh3)] (11) by reaction with ClCPh3. 1003 Compound 10 is converted into 1 by [NMe4]OH and to [V(NS3)NLi(THF)(2)] 1004 (12) by LiNPri in THF. 1005 A further range of imido complexes [V(NS3)(NR4)] (R-4 = C6H4Y-4, where 1006 Y = H (13a), OMe (13b), Me (13c), Cl (13d), Br (13e), NO2 (13f); R-4 = 1007 C6H4Y-3, where Y = OMe (13g); Cl (13h); R-4 = C6H3Y2-3,4, where Y = Me 1008 (13i); C1(13j); R-4 = C6H11 (13k)) has been prepared by reaction of 1 1009 with (RNCO)-N-4. The precursor complex [V(OS2)O(dipp)] (14) [OS22- = 1010 O(CH2CH2S)(2)(2-)] has been prepared from [VO(OPri)(3)], Hdipp, and 1011 OS2H2 It reacts with NH2NMe2 to give [V(OS2)(NH2Me2)(dipp)] (15) and 1012 with NsSiMe(3) to give [V(OS2)(NSiMe3)(dipp)] (16). A second oxide 1013 precursor, formulated as [V(OS2)(1.5)O] (17), has also been obtained, 1014 and it reacts with SiMe3NHNMe2 to give [V(OS2)(NNMe2)(OSiMe3)] (18). 1015 The X-ray crystal structures of the complexes 2b, 2c, 4, 6, 7a, 8a, 9, 1016 ill, 13d, 14, 15, 16, and 18 have been determined, and the V-51 NMR and 1017 other spectroscopic parameters of the complexes are discussed in terms 1018 of electronic effects. 1019 C1 John Innes Ctr Plant Sci Res, Nitrogen Fixat Lab, Norwich NR4 7UH, Norfolk, England. 1020 Univ Wroclaw, Fac Chem, PL-50383 Wroclaw, Poland. 1021 RP Sanders, JR, John Innes Ctr Plant Sci Res, Nitrogen Fixat Lab, Colney 1022 Lane, Norwich NR4 7UH, Norfolk, England. 1023 NR 49 1024 TC 17 1025 PU AMER CHEMICAL SOC 1026 PI WASHINGTON 1027 PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA 1028 SN 0020-1669 1029 J9 INORG CHEM 1030 JI Inorg. Chem. 1031 PD AUG 7 1032 PY 2000 1033 VL 39 1034 IS 16 1035 BP 3485 1036 EP 3498 1037 PG 14 1038 SC Chemistry, Inorganic & Nuclear 1039 GA 343TN 1040 UT ISI:000088717900011 1041 ER 1042 1043 1044 PT J 1045 AU Safavi, A 1046 Sedghy, HR 1047 Shams, E 1048 TI Kinetic spectrophotometric determination of trace amounts of selenium 1049 and vanadium 1050 SO FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY 1051 LA English 1052 DT Article 1053 ID ANALYTICAL-CHEMISTRY; REDUCTION; SULFIDE 1054 AB A sensitive kinetic spectrophotometric method has been developed for 1055 the determination of Se(IV) over the range of 45 to 4000 ng in 10 mt of 1056 solution. The method is based on the catalytic effect of Se(TV)on the 1057 reduction reaction of bromate by hydrazinium dichloride, with 1058 subsequent reaction of Ponceau S with products of the above reaction 1059 (chlorine and bromine),causing color changing of Ponceau S. Method 1060 development includes optimization of time interval for measurement of 1061 slope, pH, reagents concentration, and temperature. The optimized 1062 conditions yielded a theoretical detection limit of 33 ng/10 mt of 1063 solution of Se(IV). The interfering effects were studied and removed. 1064 The method was applied to the determination of selenium in spiked 1065 water, Kjeldahl tablet, selenium tablet, and shampoo. Vanadium(V) has 1066 an inhibition effect on the catalyzed reaction of bromate and hydrazine 1067 by selenium. Using this effect, V(V) can be determined in the range of 1068 70 to 2500 ng in 10 mt of solution. The optimization procedure includes 1069 pH and selenium concentration. An extraction method was used for 1070 interference removal. The method was applied to the determination of 1071 vanadium in petroleum. 1072 C1 Shiraz Univ, Fac Sci, Dept Chem, Shiraz, Iran. 1073 RP Safavi, A, Shiraz Univ, Fac Sci, Dept Chem, Shiraz, Iran. 1074 NR 30 1075 TC 2 1076 PU SPRINGER VERLAG 1077 PI NEW YORK 1078 PA 175 FIFTH AVE, NEW YORK, NY 10010 USA 1079 SN 0937-0633 1080 J9 FRESENIUS J ANAL CHEM 1081 JI Fresenius J. Anal. Chem. 1082 PD NOV 1083 PY 1999 1084 VL 365 1085 IS 6 1086 BP 504 1087 EP 510 1088 PG 7 1089 SC Chemistry, Analytical 1090 GA 259KL 1091 UT ISI:000083893000006 1092 ER 1093 1094 1095 PT J 1096 AU Sangeetha, NR 1097 Pal, S 1098 TI Syntheses and structures of square-pyramidal acetonitrile coordinated 1099 copper(II) complexes with N-(aroyl)-N '(5-nitrosalicylidene)hydrazines 1100 SO JOURNAL OF CHEMICAL CRYSTALLOGRAPHY 1101 LA English 1102 DT Article 1103 DE X-ray structure; pentacoordinated copper(II); square-pyramid; 1104 acetonitrile coordination 1105 ID SCHIFF-BASE COMPLEXES; CRYSTAL-STRUCTURE; TRANSITION-METALS; AROYL 1106 HYDRAZONES; LIGANDS; VANADIUM(V); CHEMISTRY 1107 AB The syntheses and structures of two square-pyramidal acetonitrile 1108 coordinated copper(II) complexes, [Cu(HbhsNO(2))(CH3CN)(2)]ClO4 (1) and 1109 [Cu(HahsNO(2)) (CH3CN)(ClO4)] (2), are described. The mononegative 1110 ligands are obtained by deprotonation of the phenolic-OH of 1111 N-(benzoyl)-N'-(5-nitrosalicylidene)hydrazine (H(2)bhsNO(2)) and of 1112 N-(anisoyl)-N'-(5-nitrosalicylidene)hydrazine (H(2)ahsNO(2)). Crystal 1113 data for 1: monoclinic, P2(1)/c (#14), a = 9.7245(14), b = 20.23(4), c 1114 = 11.042(3) Angstrom, beta = 91.86(2)degrees, V = 2171.0(7) 1115 Angstrom(3), and Z = 4 and for 2: triclinic, P (1) over bar (#2), a = 1116 9.7710(19), b = 9.9687(15), c = 11.062(5) Angstrom, alpha = 73.10(3), 1117 beta = 88.77(3), gamma = 88.379(14)degrees, V = 1030.4(5) Angstrom(3), 1118 and Z = 2. In each complex the planar ligand binds the metal ion via 1119 phenolate-O, imine-N, and amide-O. The nitrogen of an acetonitrile 1120 molecule satisfies the fourth site of the square-plane containing the 1121 metal ion. In 1 the axial coordination is provided by the nitrogen of a 1122 second acetonitrile molecule, whereas in 2 one of the oxygen atoms of 1123 the perchlorate occupies the fifth axial site. The axial acetonitrile 1124 molecule of 1 is bound to the metal center in a bent mode. The other 1125 noticeable difference between the two structures is in the geometry at 1126 the metal center. A large displacement (0.23 Angstrom) of the metal ion 1127 from the ONON basal plane towards the axial coordinating atom is 1128 observed in 1. On the other hand, there is no displacement of the metal 1129 center from the same ONON basal plane in 2. The EPR and electronic 1130 spectral features in acetonitrile solutions are consistent with the 1131 solid state structures. 1132 C1 Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh, India. 1133 RP Pal, S, Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh, 1134 India. 1135 NR 44 1136 TC 6 1137 PU KLUWER ACADEMIC/PLENUM PUBL 1138 PI NEW YORK 1139 PA 233 SPRING ST, NEW YORK, NY 10013 USA 1140 SN 1074-1542 1141 J9 J CHEM CRYSTALLOGRAPHY 1142 JI J. Chem. Crystallogr. 1143 PD MAR 1144 PY 1999 1145 VL 29 1146 IS 3 1147 BP 287 1148 EP 293 1149 PG 7 1150 SC Crystallography; Spectroscopy 1151 GA 225ND 1152 UT ISI:000081966900005 1153 ER 1154 1155 1156 PT J 1157 AU Goodall, P 1158 TI Determination of total and extractable hydrogen peroxide in organic and 1159 aqueous solutions of uranyl nitrate 1160 SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY 1161 LA English 1162 DT Article 1163 ID FLOW-INJECTION ANALYSIS 1164 AB The development of a spectrophotometric method for the determination of 1165 hydrogen peroxide in uranyl nitrate solutions is reported. The method 1166 involves the measurement of the absorbance at 520 nm of a vanadyl 1167 peroxide species. This species was formed by the addition of a reagent 1168 consisting of vanadium (V) (50 mmol.dm(-3)) in dilute sulphuric acid (2 1169 mol.dm(-3) H2SO4) This reagent, after dilution, was also used as an 1170 extractant for organic phase samples. The method is simple and robust 1171 and tolerant of nitric acid and U(VI). Specificity and accuracy were 1172 improved by the application of solid phase extraction techniques to 1173 remove entrained organic solvents and Pu(IV). Reverse phase solid phase 1174 extraction was used to clean-up aqueous samples or extracts which were 1175 contaminated with entrained solvent. A solid phase extraction system 1176 based upon an extraction chromatography system was used to remove 1177 Pu(IV). Detection limits of 26 mu mol.dm(-3) (0.88 mu g.cm(-3)) or 7 mu 1178 mol.dm(-3) (0.24 mu g.cm(-3)) for, respectively, a 1 and 4 cm path 1179 length cell were obtained. Precisions of RSD = 1.4% and 19.5% were 1180 obtained at the extremes of the calibration curve (5 mmol.dm(-3) and 50 1181 mu mol.dm(-3) H2O2, 1 cm cell). The introduction of the extraction and 1182 clean-up stages had a negligible effect upon the precision of the 1183 determination. The stability of an organic phase sample was tested and 1184 no loss of analyte could be discerned over a period of at least 5 days. 1185 The presence of trace levels of reductants interfered with the 1186 determination, e.g., hydrazine (<2 mmol.dm(-3)), but this effect was 1187 ameliorated by increasing the concentration of the colormetric reagent. 1188 C1 BNFL, Seascale CA20 1PG, Cumbria, England. 1189 RP Goodall, P, BNFL, Bldg 229 Sellafield, Seascale CA20 1PG, Cumbria, 1190 England. 1191 NR 7 1192 TC 0 1193 PU ELSEVIER SCIENCE SA 1194 PI LAUSANNE 1195 PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND 1196 SN 0236-5731 1197 J9 J RADIOANAL NUCL CHEM 1198 JI J. Radioanal. Nucl. Chem. 1199 PD APR 1200 PY 1999 1201 VL 240 1202 IS 1 1203 BP 5 1204 EP 13 1205 PG 9 1206 SC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science 1207 & Technology 1208 GA 191NB 1209 UT ISI:000080027500002 1210 ER 1211 1212 1213 PT J 1214 AU Fahmi, N 1215 Singh, RV 1216 TI Synthetic, structural and biological studies of oxovanadium(V) 1217 complexes of azomethines 1218 SO INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL 1219 THEORETICAL & ANALYTICAL CHEMISTRY 1220 LA English 1221 DT Article 1222 ID BENZOTHIAZOLINES; MANGANESE(II); VANADIUM; VANADATE 1223 AB A few metal complexes of oxovanadium(V) with 1224 2-(2-fluorophenyl-methylene) hydrazine carbothioamide or -carboxamide 1225 and 2-[1-(2-fluorophenyl)ethylidene] hydrazine carbothioamide or 1226 -carboxamide have been synthesized and characterized by elemental 1227 analysis, molecular weight determinations, molar conductance, magnetic 1228 measurements, IR, H-1 NMR and F-19 NMR studies. The IR and NMR spectral 1229 data suggest the involvement of sulphur/oxygen and azomethine nitrogen 1230 in coordination to the central metal ion. The free ligands and their 1231 metal complexes have been tested in vitro against a number of 1232 microorganisms to assess their antimicrobial properties. 1233 C1 Univ Rajasthan, Dept Chem, Jaipur 302004, Rajasthan, India. 1234 RP Singh, RV, Univ Rajasthan, Dept Chem, Jaipur 302004, Rajasthan, India. 1235 NR 16 1236 TC 6 1237 PU NATL INST SCIENCE COMMUNICATION 1238 PI NEW DELHI 1239 PA DR K S KRISHNAN MARG, NEW DELHI 110 012, INDIA 1240 SN 0376-4710 1241 J9 INDIAN J CHEM SECT A 1242 JI Indian J. Chem. Sect A-Inorg. Bio-Inorg. Phys. Theor. Anal. Chem. 1243 PD DEC 1244 PY 1998 1245 VL 37 1246 IS 12 1247 BP 1126 1248 EP 1129 1249 PG 4 1250 SC Chemistry, Multidisciplinary 1251 GA 177VR 1252 UT ISI:000079232200019 1253 ER 1254 1255 1256 PT J 1257 AU Davies, SC 1258 Durrant, MC 1259 Hughes, DL 1260 Le Floc'h, C 1261 Pope, SJA 1262 Reid, G 1263 Richards, RL 1264 Sanders, JR 1265 TI Synthesis, spectroscopic and EXAFS studies of vanadium complexes of 1266 trithioether ligands and crystal structures of [VCl3([9]aneS(3))] and 1267 [VI2(thf)([9]aneS(3))] ([9]aneS(3) = 1,4,7-trithiacyclononane) 1268 SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS 1269 LA English 1270 DT Article 1271 ID THIOETHER; NITROGENASES; COORDINATION; REACTIVITY; CONVERSION; 1272 HYDRAZINE; CHEMISTRY; AMMONIA 1273 AB A series of vanadium-(II), -(III) and -(Iv) macrocyclic thioether 1274 complexes has been synthesized and characterised by analytical, 1275 magnetic and spectroscopic methods. The new complexes reported are 1276 [{V([9]aneS(3))}(2)(mu-Cl)(3)]Cl ([9]aneS(3) = 1277 1,4,7-trithiacyclononane), [VI2(thf)([9]aneS(3))], [VI2(ttob)] (ttob = 1278 2,5,8-trithia[9]-o-benzenophane), [VX3([9]aneS(3))] (X = Cl, Br or I), 1279 [VX3([10]aneS(3))] ([10]aneS(3) = 1,4,7-trithiacyclodecane), 1280 [VCl3(ttob)], [VCl3([16]aneS(4))] ([16]aneS(4) = 1281 1,5,9,13-tetrathiacyclohexadecane), [(VX3)(2)(mu-[18]aneS(6))] (X = Cl 1282 or Br [18]aneS(6) = 1,4,7,10,13,16-hexathiacyclooctadecane) and 1283 [VOCl2(ttob)]. The crystal structures of [VI2(thf)([9]aneS(3))] and 1284 [VCl3([9]aneS(3))] and EXAFS structural data for [VX3([9]aneS(3))] and 1285 [VX3([10]aneS(3))] are presented and discussed. The acyclic 1286 trithioether complexes [VX3{MeC(CH2SMe)(3)}] (X = Cl or Br) and the 1287 complex [VI2(py)(4)] are also reported. 1288 C1 Univ Southampton, Dept Chem, Southampton SO17 1BJ, Hants, England. 1289 John Innes Ctr Plant Sci Res, Nitrogen Fixat Lab, Norwich NR4 7UH, Norfolk, England. 1290 RP Reid, G, Univ Southampton, Dept Chem, Southampton SO17 1BJ, Hants, 1291 England. 1292 NR 45 1293 TC 7 1294 PU ROYAL SOC CHEMISTRY 1295 PI CAMBRIDGE 1296 PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE CB4 4WF, 1297 CAMBS, ENGLAND 1298 SN 0300-9246 1299 J9 J CHEM SOC DALTON TRANS 1300 JI J. Chem. Soc.-Dalton Trans. 1301 PD JUL 7 1302 PY 1998 1303 IS 13 1304 BP 2191 1305 EP 2198 1306 PG 8 1307 SC Chemistry, Inorganic & Nuclear 1308 GA 102KW 1309 UT ISI:000074924300013 1310 ER 1311 1312 1313 PT J 1314 AU Sun, CQ 1315 Liu, GJ 1316 Zhang, HA 1317 TI Fabrication of a self-assembling film electrode containing 1318 vanadium-oxygen phthalocyanine and its electrocatalytic oxidation for 1319 hydrazine 1320 SO CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 1321 LA Chinese 1322 DT Article 1323 DE molecular deposition technique; self-assembling film; vanadium-oxygen 1324 phthalocyanine; hytrazine 1325 ID MOLECULAR ASSEMBLIES; GOLD; MONOLAYERS; SURFACES 1326 AB A monolayer containing vanadium-oxygen phthalocyanine on the surface of 1327 2-dimethylaminoethanethiol-modified gold electrode was achieved based 1328 on electrostatic interaction. The electrode exhibits a high catalytic 1329 activity toward the electrooxidation of hydrazine. The method is very 1330 useful in other fabrication of functional molecules. 1331 C1 Jilin Univ, Dept Chem, Changchun 130023, Peoples R China. 1332 China Inst Metrol, Dept Fine Chem Res, Hangzhou 310012, Peoples R China. 1333 RP Sun, CQ, Jilin Univ, Dept Chem, Changchun 130023, Peoples R China. 1334 NR 9 1335 TC 3 1336 PU HIGHER EDUCATION PRESS 1337 PI BEIJING 1338 PA SHATANHOU ST 55, BEIJING 100009, PEOPLES R CHINA 1339 SN 0251-0790 1340 J9 CHEM J CHINESE UNIV-CHINESE 1341 JI Chem. J. Chin. Univ.-Chin. 1342 PD MAR 1343 PY 1998 1344 VL 19 1345 IS 3 1346 BP 382 1347 EP 384 1348 PG 3 1349 SC Chemistry, Multidisciplinary 1350 GA ZD364 1351 UT ISI:000072677800012 1352 ER 1353 1354 1355 PT J 1356 AU Abou-Seif, MAM 1357 TI Vanadium-mediated oxidation of NADH is enhanced by aluminium and 1358 inhibited by vitamin E and some copper (II) complexes 1359 SO ANNALS OF CLINICAL BIOCHEMISTRY 1360 LA English 1361 DT Article 1362 DE vanadium salts; superoxide dismutase-like activity 1363 ID SUPEROXIDE-DISMUTASE; RENAL-FAILURE; ANTIOXIDANTS; MECHANISMS; 1364 TOXICITY; BRAIN; ASSAY 1365 AB The effect of aluminium on vanadium-mediated oxidation of NADH was 1366 examined. The oxidation of NADH was enhanced in the presence of 1367 aluminium. The effect was concentration dependent. Vitamin E and copper 1368 (II) complexes with superoxide dismutase (COD)-like activities 1369 containing isobutyric acid hydrazine were rested for their effect on 1370 the vanadium-mediated oxidation of NADH. The stimulatory effect of 1371 aluminium was decreased upon addition of different concentrations of 1372 vitamin E and copper (II) complexes. These results indicate that the 1373 biological toxicity of aluminium may be attributed to its enhancement 1374 of the production of superoxide radicals (O-2(.-)) in association with 1375 the accumulation of other trace elements such as vanadium. 1376 C1 Mansoura Univ, Fac Sci, Dept Chem, Div Biochem, Mansoura, Egypt. 1377 RP Abou-Seif, MAM, Mansoura Univ, Fac Sci, Dept Chem, Div Biochem, 1378 Mansoura, Egypt. 1379 NR 27 1380 TC 4 1381 PU ROYAL SOC MEDICINE PRESS LTD 1382 PI LONDON 1383 PA 1 WIMPOLE STREET, LONDON W1M 8AE, ENGLAND 1384 SN 0004-5632 1385 J9 ANN CLIN BIOCHEM 1386 JI Ann. Clin. Biochem. 1387 PD NOV 1388 PY 1997 1389 VL 34 1390 PN Part 6 1391 BP 645 1392 EP 650 1393 PG 6 1394 SC Medical Laboratory Technology 1395 GA YZ024 1396 UT ISI:000072212500008 1397 ER 1398 1399 1400 PT J 1401 AU Schrock, RR 1402 TI High oxidation state coordination chemistry with triamidoamine tungsten 1403 and molybdenum complexes 1404 SO PURE AND APPLIED CHEMISTRY 1405 LA English 1406 DT Article 1407 ID PHOSPHORUS TRIPLE BOND; DINITROGEN COMPLEXES; CATALYTIC REDUCTION; 1408 CRYSTAL-STRUCTURE; HYDRAZINE; NITROGENASE; CLEAVAGE; VANADIUM; LIGANDS; 1409 CONTAIN 1410 AB In this lecture I will focus on some recent developments in the 1411 chemistry of high oxidation state dinitrogen complexes with an emphasis 1412 on recent results involving triamidoamine molybdenum complexes. 1413 RP Schrock, RR, MIT,DEPT CHEM 6331,CAMBRIDGE,MA 02139. 1414 NR 34 1415 TC 26 1416 PU BLACKWELL SCIENCE LTD 1417 PI OXFORD 1418 PA P O BOX 88, OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0NE 1419 SN 0033-4545 1420 J9 PURE APPL CHEM 1421 JI Pure Appl. Chem. 1422 PD OCT 1423 PY 1997 1424 VL 69 1425 IS 10 1426 BP 2197 1427 EP 2203 1428 PG 7 1429 SC Chemistry, Multidisciplinary 1430 GA YB877 1431 UT ISI:A1997YB87700026 1432 ER 1433 1434 1435 PT J 1436 AU Richards, RL 1437 TI Metal-sulfur chemistry and catalytic processes 1438 SO NEW JOURNAL OF CHEMISTRY 1439 LA English 1440 DT Article 1441 DE molybdenum; catalysis; sulfur; nitrogenase; xanthine oxidase; 1442 hydrodesulfurization 1443 ID IRON-MOLYBDENUM COFACTOR; CRYSTAL-STRUCTURE; XANTHINE-OXIDASE; 1444 DINITROGEN COMPLEX; THIOLATE COMPLEXES; NITROGEN-FIXATION; 1445 HYDRODESULFURIZATION; BINDING; HYDRAZINE; AMMONIA 1446 AB A number of processes involve metal catalysts where the metal carries 1447 sulfur-donor ligands. Three are discussed where metal complexes with 1448 S-donor ligands are being used to elucidate potential reaction 1449 pathways. This primarily involves the reductase nitrogenase and the 1450 metals vanadium, molybdenum, and iron but aspects of molybdenum 1451 chemistry involved in the function of the hydroxylase xanthine oxidase 1452 and of hydrodesulfurization of feedstock gases are also considered. 1453 RP Richards, RL, JOHN INNES CTR,NITROGEN FIXAT LAB,COLNEY LANE,NORWICH NR4 1454 7UH,NORFOLK,ENGLAND. 1455 NR 72 1456 TC 5 1457 PU GAUTHIER-VILLARS 1458 PI PARIS 1459 PA 120 BLVD SAINT-GERMAIN, 75280 PARIS, FRANCE 1460 SN 1144-0546 1461 J9 NEW J CHEM 1462 JI New J. Chem. 1463 PD JUN-JUL 1464 PY 1997 1465 VL 21 1466 IS 6-7 1467 BP 727 1468 EP 732 1469 PG 6 1470 SC Chemistry, Multidisciplinary 1471 GA XN485 1472 UT ISI:A1997XN48500009 1473 ER 1474 1475 1476 PT J 1477 AU Davies, SC 1478 Hughes, DL 1479 Janas, Z 1480 Jerzykiewicz, L 1481 Richards, RL 1482 Sanders, JR 1483 Sobota, P 1484 TI Vanadium complexes of the N(CH2CH2S)(3)(3-)-ligand with co-ligands 1485 relevant to nitrogen fixation processes 1486 SO CHEMICAL COMMUNICATIONS 1487 LA English 1488 DT Article 1489 ID HYDRAZINE 1490 AB Vanadium(III) and vanadium(V) complexes of the 1491 tris(2-thiolatoethyl)amine ligand L3- containing hydrazine, hydrazide, 1492 imide, ammine, cyanide and isocyanide ligands are synthesised; the 1493 complexes [V(NH3)L] and [V(NNMe2)L] have been structurally 1494 characterised. 1495 C1 JOHN INNES CTR PLANT SCI RES,NITROGEN FIXAT LAB,NORWICH NR4 7UH,NORFOLK,ENGLAND. 1496 WROCLAW B BEIRUT UNIV,FAC CHEM,PL-50383 WROCLAW,POLAND. 1497 NR 13 1498 TC 15 1499 PU ROYAL SOC CHEMISTRY 1500 PI CAMBRIDGE 1501 PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS, 1502 ENGLAND CB4 4WF 1503 SN 1359-7345 1504 J9 CHEM COMMUN 1505 JI Chem. Commun. 1506 PD JUL 21 1507 PY 1997 1508 IS 14 1509 BP 1261 1510 EP 1262 1511 PG 2 1512 SC Chemistry, Multidisciplinary 1513 GA XL701 1514 UT ISI:A1997XL70100003 1515 ER 1516 1517 1518 PT S 1519 AU Coucouvanis, D 1520 Demadis, KD 1521 Malinak, SM 1522 Mosier, PE 1523 Tyson, MA 1524 Laughlin, LJ 1525 TI Catalytic multielectron reduction of hydrazine to ammonia and acetylene 1526 to ethylene with clusters that contain the MFe(3)S(4) cores (M=Mo, V) 1527 SO TRANSITION METAL SULFUR CHEMISTRY 1528 SE ACS SYMPOSIUM SERIES 1529 LA English 1530 DT Review 1531 ID IRON MOLYBDENUM COFACTOR; LIGAND SUBSTITUTION-REACTIONS; BIOLOGICAL 1532 NITROGEN-FIXATION; CUBANE-TYPE CLUSTERS; X-RAY ABSORPTION; STRUCTURAL 1533 CHARACTERIZATION; AZOTOBACTER-VINELANDII; KLEBSIELLA-PNEUMONIAE; 1534 VANADIUM NITROGENASE; POSSIBLE RELEVANCE 1535 AB Clusters with the [MFe(3)S(4)](n+) core, (M = Mo, n=3; M = V, n=2). are 1536 used as catalysts for the reduction of substrates relevant to 1537 nitrogenase function. Substrates such as hydrazine and acetylene, are 1538 catalytically reduced by (NEt(4))(2)[(Cl-4-cat)(CH3CN)MoFe3S4Cl3], I, 1539 to ammonia and ethylene respectively, in the presence of added protons 1540 and reducing equivalents. Hydrazine also is catalytically reduced by 1541 the (NEt(4))[(DMF)(3)VFe3S4Cl3] cubane under similar conditions. 1542 Catalysis in excess of 100 turnovers (for hydrazine reduction) and in 1543 excess of 15 turnovers (for acetylene reduction) has been observed over 1544 a period of 24 hours. Kinetic studies of the acetylene reduction 1545 reaction have been carried out. Considerable evidence has been amassed 1546 which directly implicates the Mo and V atoms as the primary catalytic 1547 sites. The reduction of hydrazine is accelerated in the presence of 1548 carboxylate ligands bound to the Mo atom in I and this effect is 1549 interpreted in terms of a proton delivery shuttle involving the 1550 carboxylate group and the substrate during reduction. The possible role 1551 of the homocitrate ligand in the nitrogen cofactor is analyzed in terms 1552 of these findings. 1553 RP Coucouvanis, D, UNIV MICHIGAN,DEPT CHEM,ANN ARBOR,MI 48109. 1554 NR 77 1555 TC 8 1556 PU AMER CHEMICAL SOC 1557 PI WASHINGTON 1558 PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 1559 SN 0097-6156 1560 J9 ACS SYMP SER 1561 PY 1996 1562 VL 653 1563 BP 117 1564 EP 134 1565 PG 18 1566 SC Chemistry, Multidisciplinary 1567 GA BG97E 1568 UT ISI:A1996BG97E00006 1569 ER 1570 1571 1572 PT J 1573 AU Kopka, K 1574 Mattes, R 1575 TI A dinuclear vanadium(V) complex with (eta(1))- and 1576 (mu-eta(2):eta(2))-bonded hydrazido(2-) ligands 1577 SO ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 1578 LA German 1579 DT Article 1580 DE vanadium(V) compounds; hydrazido(2-) complexes; crystal structure 1581 ID CRYSTAL-STRUCTURES; MOLECULAR-STRUCTURES; DINITROGEN; HYDRAZINE; 1582 DERIVATIVES; MODEL 1583 AB The title complex was obtained by reaction of guanidinium 1584 dioxodipicolinatovanadate(V) and N-methyl-N-phenylhydrazine. According 1585 to the single crystal structure analysis the dinuclear anion 1586 [(mu-PhNNH)(mu-OCH3){(MePhNN(dipic)V)}(2)](-) with sevenfold 1587 coordinated metal centers contains two types of hydrazido ligands. The 1588 Ligand [MePhNN](2-) is terminally bonded, and the VNN unit is linear 1589 with extensive electron delocalisation. The V-N and N-N bond lengths 1590 are 167.9(5) and 131.9(6) pm, respectively. The bonding of the bridging 1591 ligand is of the hitherto unknown mu-eta(2):eta(2) type, with V-N and 1592 N-N bond lengths of 202.5(5) and 136.5(5) pm, respectively. The V(N-2)V 1593 moiety is not planar. The compound was also characterized by H-1 and 1594 V-51 NMR spectroscopy. 1595 C1 UNIV MUNSTER,INST ANORGAN CHEM,D-48149 MUNSTER,GERMANY. 1596 NR 29 1597 TC 1 1598 PU VERLAG Z NATURFORSCH 1599 PI TUBINGEN 1600 PA POSTFACH 2645, W-7400 TUBINGEN, GERMANY 1601 SN 0932-0776 1602 J9 Z NATURFORSCH SECT B 1603 JI Z.Naturforsch.(B) 1604 PD DEC 1605 PY 1996 1606 VL 51 1607 IS 12 1608 BP 1675 1609 EP 1678 1610 PG 4 1611 SC Chemistry, Inorganic & Nuclear; Chemistry, Organic 1612 GA WD024 1613 UT ISI:A1996WD02400002 1614 ER 1615 1616 1617 PT J 1618 AU Coucouvanis, D 1619 TI Functional analogs for the reduction of certain nitrogenase substrates. 1620 Are multiple sites within the Fe/Mo/S active center involved in the 1621 6e(-) reduction of N-2? 1622 SO JOURNAL OF BIOLOGICAL INORGANIC CHEMISTRY 1623 LA English 1624 DT Editorial Material 1625 DE nitrogenase; analogs; function; catalysis; reduction 1626 ID IRON-MOLYBDENUM COFACTOR; MERCAPTO-CARBOXYLATE LIGANDS; STRUCTURAL 1627 CHARACTERIZATION; DOUBLE CUBANES; AZOTOBACTER-VINELANDII; VANADIUM 1628 NITROGENASE; CATALYTIC REDUCTION; CLOSTRIDIUM-PASTEURIANUM; 1629 POLYCARBOXYLATE LIGANDS; KLEBSIELLA-PNEUMONIAE 1630 AB Reactivity studies of clusters that contain the MFe(3)S(4) cores (M = 1631 Mo, V) with catecholate, multicarboxylate (or DMF) ligands coordinated 1632 to the Mo (or V) atoms, and Cl ligands coordinated to the Fe atoms have 1633 been carried out. These studies show the M/Fe/S single cubane clusters 1634 to be effective catalysts in the reduction of nitrogenase substrates 1635 such as hydrazine, acetylene and protons to give ammonia, ethylene and 1636 dihydrogen respectively. The same molecules do not activate or catalyze 1637 the reduction of dinitrogen. The results indicate that the observed 1638 catalyses are occurring at the Mo (V) sites by a process that, in the 1639 case of hydrazine, involves substrate protonation prior to reduction. 1640 The facile catalytic reduction of hydrazine by clusters that contain 1641 coordinatively saturated polycarboxylate-bound Mo atoms is rationalized 1642 in terms of a possible protonation/proton delivery function of the 1643 coordinated polycarboxylate ligands. The reactivity characteristics of 1644 the M/Fe/S clusters (structurally quite similar to the nitrogenase 1645 cofactor) have led to the suggestion that the Mo (V) atoms may be 1646 involved in the reduction of hydrazine in the later stages of 1647 dinitrogen reduction. 1648 RP Coucouvanis, D, UNIV MICHIGAN,DEPT CHEM,ANN ARBOR,MI 48109. 1649 NR 60 1650 TC 37 1651 PU SPRINGER VERLAG 1652 PI NEW YORK 1653 PA 175 FIFTH AVE, NEW YORK, NY 10010 1654 SN 0949-8257 1655 J9 J BIOL INORG CHEM 1656 JI J. Biol. Inorg. Chem. 1657 PD DEC 1658 PY 1996 1659 VL 1 1660 IS 6 1661 BP 594 1662 EP 600 1663 PG 7 1664 SC Biochemistry & Molecular Biology; Chemistry, Inorganic & Nuclear 1665 GA WA565 1666 UT ISI:A1996WA56500017 1667 ER 1668 1669 1670 PT J 1671 AU Durrant, MC 1672 Davies, SC 1673 Hughes, DL 1674 LeFloch, C 1675 Richards, RL 1676 Sanders, JR 1677 Champness, NR 1678 Pope, SJ 1679 Reid, G 1680 TI Crown thioether complexes of vanadium(II), vanadium(III) and 1681 vanadium(IV): X-ray crystal structure of [VCl3([9]aneS(3))] 1682 SO INORGANICA CHIMICA ACTA 1683 LA English 1684 DT Article 1685 DE vanadium complexes; macrocyclic thioether complexes; crystal structures 1686 ID NITROGENASE; AZOTOBACTER; PROTONATION; DINITROGEN; HYDRAZINE; AMMONIA; 1687 CUBANES; MO 1688 AB The synthesis of macrocyclic thioether complexes of vanadium(II), 1689 vanadium(III) and vanadium(IV) and the X-ray structure of [VCl3 ([9] 1690 aneS(3))] are described. 1691 C1 JOHN INNES CTR PLANT SCI RES,NITROGEN FIXAT LAB,NORWICH NR4 7UH,NORFOLK,ENGLAND. 1692 UNIV SOUTHAMPTON,DEPT CHEM,SOUTHAMPTON S09 5NH,HANTS,ENGLAND. 1693 NR 19 1694 TC 8 1695 PU ELSEVIER SCIENCE SA LAUSANNE 1696 PI LAUSANNE 1 1697 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND 1698 SN 0020-1693 1699 J9 INORG CHIM ACTA 1700 JI Inorg. Chim. Acta 1701 PD OCT 1 1702 PY 1996 1703 VL 251 1704 IS 1-2 1705 BP 13 1706 EP 14 1707 PG 2 1708 SC Chemistry, Inorganic & Nuclear 1709 GA VX967 1710 UT ISI:A1996VX96700004 1711 ER 1712 1713 1714 PT J 1715 AU LeFloch, C 1716 Henderson, RA 1717 Hitchcock, PB 1718 Hughes, DL 1719 Janas, Z 1720 Richards, RL 1721 Sobota, P 1722 Szafert, S 1723 TI Reactions of substituted hydrazines with vanadium(III) compounds: 1724 Crystal structures of [NH(2)Me(2)](2)[(VCl3)(2)(mu-NNMe(2))(3)], 1725 [V(OC6H3Pr2i-2,6)(3)(NH(2)NMe(2))(2)] and 1726 [V(OC6H3Pr2i-2,6)(3)(NH(2)NMePh)2] 1727 SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS 1728 LA English 1729 DT Article 1730 ID MOLECULAR-STRUCTURE; COMPLEXES; DINITROGEN; BRIDGES; LIGANDS; GEOMETRY; 1731 AMMONIA; BONDS; ATOMS 1732 AB Reaction of Me(3)SiNHNMe(2) with [VCl3(PMePh(2))(2)] or [VCl3(thf)(3)] 1733 (thf = tetrahydrofuran) gave the triply hydrazide-bridged complex 1734 [NH(2)Me(2)](2)[(VCl3)(2)(mu-NNMe(2))(3)] 1 the crystal structure of 1735 which has been determined. Cyclic voltammetry shows 1 to have 1736 E(1/2)(ox) = 0.30 V (reversible at -35 degrees C) and E(2)(ox) = 1.35 V 1737 (vs. ferrocene-ferrocenium). Cation exchange gave 1738 [PPh(4)](2)[(VCl3)(2)(mu-NNMe(2))(3)] and reaction with 1739 Li(SC6H2Pr3i-2,4,6) gave 1740 [NH(2)Me(2)](2)[{V(SC6H2Pr3i-2,4,6)(3)}(2)(mu-NN(2)Me(2))(2)]. 1741 Treatment of [V(OC6H3Pr2i-2,6)(4)Li(thf)] with NH(2)NMe(2) gave the 1742 low-melting compound [V(OC6H3Pr2i-2,6)(3)(NH(2)NMe(2))(2)], shown by 1743 astructure determination to be essentially trigonal bipyramidal, with 1744 axial hydrazine ligands. The analogue 1745 [V(OC6H3Pr2i-2,6)(3)(NH(2)NMePh)(2)] has also been prepared and shown 1746 to have a similar structure. 1747 C1 JOHN INNES CTR PLANT SCI RES,NITROGEN FIXAT LAB,NORWICH NR4 7UH,NORFOLK,ENGLAND. 1748 UNIV SUSSEX,SCH CHEM & MOLEC SCI,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND. 1749 WROCLAW B BEIRUT UNIV,INST CHEM,PL-50383 WROCLAW,POLAND. 1750 NR 32 1751 TC 13 1752 PU ROYAL SOC CHEMISTRY 1753 PI CAMBRIDGE 1754 PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, 1755 ENGLAND CB4 4WF 1756 SN 0300-9246 1757 J9 J CHEM SOC DALTON TRANS 1758 JI J. Chem. Soc.-Dalton Trans. 1759 PD JUL 7 1760 PY 1996 1761 IS 13 1762 BP 2755 1763 EP 2762 1764 PG 8 1765 SC Chemistry, Inorganic & Nuclear 1766 GA UW625 1767 UT ISI:A1996UW62500024 1768 ER 1769 1770 1771 PT J 1772 AU Ramis, G 1773 Yi, L 1774 Busca, G 1775 Turco, M 1776 Kotur, E 1777 Willey, RJ 1778 TI Adsorption, activation, and oxidation of ammonia over SCR catalysts 1779 SO JOURNAL OF CATALYSIS 1780 LA English 1781 DT Article 1782 ID VANADIUM-OXIDE CATALYSTS; NITRIC-OXIDE; FT-IR; SELECTIVE OXIDATION; 1783 TITANIA CATALYSTS; NITROGEN-DIOXIDE; CR2O3 CATALYSTS; REDUCTION; 1784 SURFACE; NH3 1785 AB The catalytic activity in the reduction of NO by ammonia in the 1786 presence of oxygen (SCR process) is reported for CuO-TiO2 and for 1787 different catalysts belonging to the MgO-Fe2O3 system. These materials 1788 show high activity even at relatively low temperatures, with a maximum 1789 NO conversion near 520 K (CuO-TiO2) and 600 K (MgO-Fe2O3). At higher 1790 temperatures, NO conversion is reduced because of the competitive NH3 1791 oxidation by O-2 to NOx and N-2. The adsorption and transformation of 1792 ammonia over these systems has been investigated by FT-IR spectroscopy 1793 in vacuum and in contact with oxygen and NO. In all cases ammonia is 1794 first coordinated over Lewis sites and later undergoes hydrogen 1795 abstraction giving rise either to NH2 amide species or to its dimeric 1796 form N2H4, hydrazine, detected over CuO-TiO2 and gamma-Fe2O3. Other 1797 species tentatively identified as imide NH, nitroxyl HNO, nitrogen 1798 anions N-2(-) and azide anions N-3(-) are produced further. In the 1799 presence of NO3- coordinated ammonia rapidly disappears, the above 1800 intermediates are not found, and water is produced, showing that the 1801 SCR reaction occurred. Ammonia protonation to ammonium ion is not 1802 detected at all over these systems. It seems consequently demonstrated 1803 that Bronsted acidity is not necessary for the appearance of SCR 1804 activity. A comparison with the previously-published data on 1805 V2O5-TiO2-based systems is done and mechanisms of ammonia oxidation by 1806 oxygen and by NO are proposed. (C) 1995 Academic Press, Inc. 1807 C1 UNIV GENOA,FAC INGN,IST CHIM,I-16129 GENOA,ITALY. 1808 UNIV NAPLES FEDERICO II,DIPARTIMENTO INGN CHIM,I-80125 NAPLES,ITALY. 1809 NORTHEASTERN UNIV,DEPT CHEM ENGN,BOSTON,MA 02115. 1810 NR 72 1811 TC 75 1812 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS 1813 PI SAN DIEGO 1814 PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 1815 SN 0021-9517 1816 J9 J CATAL 1817 JI J. Catal. 1818 PD DEC 1819 PY 1995 1820 VL 157 1821 IS 2 1822 BP 523 1823 EP 535 1824 PG 13 1825 SC Chemistry, Physical; Engineering, Chemical 1826 GA TK598 1827 UT ISI:A1995TK59800026 1828 ER 1829 1830 1831 PT J 1832 AU KOPKA, K 1833 MATTES, R 1834 TI DERIVATIVES OF HYDRAZINE AS LIGANDS IN VANADIUM(IV) AND VANADIUM(V) 1835 COMPLEXES - SYNTHESIS AND CRYSTAL-STRUCTURES OF 3 DIMERIC COMPLEXES 1836 WITH HYDRAZIDO AND HYDRAZONATO LIGANDS 1837 SO ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 1838 LA German 1839 DT Article 1840 ID OXOVANADIUM(IV) 1841 AB The complexes [(mu-PhCONNCOPh){VOCl(NHNHCOPh)(2)}]. 5 CH3CN, (1), 1842 [(mu-PhCONNCOPh)(V(dbh)}(2)]. 2 CH3CN, (2) and [(VO)(2)(tbh)], (3) have 1843 been prepared by reaction of VCl2(acac)(2), acac = acetylacetonato(1-), 1844 and VCl2(acpn), acpn = propylendiimino-bis(acetylacetonato(2-)), with 1845 benzoylhydrazine. The structures of the centrosymmetric dimeric 1846 molecules 1-3 have been determined by single crystal X-ray diffraction. 1847 1 and 2 contain both doubly deprotonated N,N'-dibenzoylhydrazine as 1848 bridging, doubly N,O chelating ligand. In 1 the two remaining 1849 coordination sites at the VOCl group are occupied by the hydrazido(1-) 1850 ligand [NHNHCOPh](-). 2 is a non-ore vanadium(IV) complex. The 1851 coordination geometry is approximately trigonal prismatic. The pi-back 1852 donating effect of the oxo function is substituted by back donation 1853 from three negatively charged enolic oxygen atoms. The V-O bond lengths 1854 range from 192.0(2) to 193.7(2) pm. 3 contains a unique highly 1855 symmetrical octadentate ligand, formed during the synthesis. It is 1856 coordinated to two oxovanadin(IV) centers by N,O chelation. The 1857 coordination geometry is square pyramidal. 1858 C1 UNIV MUNSTER,INST ANORGAN CHEM,D-48149 MUNSTER,GERMANY. 1859 NR 19 1860 TC 3 1861 PU VERLAG Z NATURFORSCH 1862 PI TUBINGEN 1863 PA POSTFACH 2645, W-7400 TUBINGEN, GERMANY 1864 SN 0932-0776 1865 J9 Z NATURFORSCH SECT B 1866 JI Z.Naturforsch.(B) 1867 PD SEP 1868 PY 1995 1869 VL 50 1870 IS 9 1871 BP 1281 1872 EP 1286 1873 PG 6 1874 SC Chemistry, Inorganic & Nuclear; Chemistry, Organic 1875 GA RX010 1876 UT ISI:A1995RX01000001 1877 ER 1878 1879 1880 PT J 1881 AU REDDY, CK 1882 KAKKAR, LR 1883 TI DETERMINATION OF VANADIUM BY EXTRACTION OF V(IV)-THIOCYANATE INTO ETHYL 1884 METHYL KETONE 1885 SO NATIONAL ACADEMY SCIENCE LETTERS-INDIA 1886 LA English 1887 DT Article 1888 DE VANADIUM; THIOCYANATE; ETHYL METHYL KETONE; SPECTROPHTOMETRIC 1889 DETERMINATION 1890 AB A simple and rapid method for the determination of vanadium has been 1891 worked out. In presence of hydrazine sulphate, vanadium forms a green 1892 coloured complex with thiocyanate in HCl solution, whose absorbance was 1893 measured at lambda(max) 675 nm, after extraction into ethyl methyl 1894 ketone. The method is free from the interference of several ions of 1895 analytical importance and can analyse satisfactorily samples df varying 1896 complexity. Vanadium and thiocyanate were present in the ratio of 1:2 1897 in the extracted species. 1898 RP REDDY, CK, KURUKSHETRA UNIV,DEPT CHEM,KURUKSHETRA 132119,HARYANA,INDIA. 1899 NR 0 1900 TC 2 1901 PU NATL ACAD SCIENCES INDIA 1902 PI ALLAHABAD 1903 PA 5 LAJPATRAI RD, ALLAHABAD 211002, INDIA 1904 SN 0250-541X 1905 J9 NATL ACAD SCI LETT 1906 JI Natl. Acad. Sci. Lett.-India 1907 PD SEP-OCT 1908 PY 1994 1909 VL 17 1910 IS 9-10 1911 BP 189 1912 EP 190 1913 PG 2 1914 SC Multidisciplinary Sciences 1915 GA QT344 1916 UT ISI:A1994QT34400007 1917 ER 1918 1919 1920 PT J 1921 AU MALINAK, SM 1922 DEMADIS, KD 1923 COUCOUVANIS, D 1924 TI CATALYTIC REDUCTION OF HYDRAZINE TO AMMONIA BY THE VFE3S4 CUBANES - 1925 FURTHER EVIDENCE FOR THE DIRECT INVOLVEMENT OF THE HETEROMETAL IN THE 1926 REDUCTION OF NITROGENASE SUBSTRATES AND POSSIBLE RELEVANCE TO THE 1927 VANADIUM NITROGENASES 1928 SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 1929 LA English 1930 DT Article 1931 ID IRON-SULFUR CLUSTERS; BRIDGED DOUBLE CUBANES; STRUCTURAL 1932 CHARACTERIZATION; AZOTOBACTER-CHROOCOCCUM; ELECTRONIC-PROPERTIES; 1933 STEPWISE SYNTHESIS; <MOFE3S4>3+ CORES; PROTEIN; <VFE3S4>2+; COFACTOR 1934 AB The catalytic behavior of synthetic Fe/V/S clusters that structurally 1935 resemble the Fe/V/S site of nitrogenase is reported. The 1936 [(L)(L')(L'')VFe3S4Cl3](n-) clusters (L, L', L'' = DMF, n = 1; L = 1937 PEt(3), L', L'' = DMF, n = 1; L, L' = 2,2'-bipyridyl, L'' = DMF, n = 1) 1938 that contain the [VFe3S4](2-) cuboidal core are effective catalysts in 1939 the reduction of hydrazine (a nitrogenase substrate) to ammonia in the 1940 presence of cobaltocene and 2,6-lutidine hydrochloride as sources of 1941 electrons and protons, respectively. Reactivity studies show that 1942 V-coordinated terminal ligands have a profound effect on the relative 1943 rates of hydrazine reduction. Specifically, as the number of labile 1944 solvent molecules coordinated to the V atom decreases, the relative 1945 rate of hydrazine reduction decreases. The behavior also is observed 1946 with the [(HBpz3)VFe3S4Cl3](2-) cubane (L, L', L'' = 1947 hydrotris(pyrazolyl)borate, n = 2), where all coordination sites on the 1948 V atom are ''blocked''. The latter shows no catalytic or stoichiometric 1949 hydrazine reduction and its structure has been determined. To 1950 investigate the role of the Fe sites in the [VFe3S4](2+) cubanes during 1951 catalysis, a series of cubanes [(DMF)(3)VFe(3)S(4)X(3)](-) (X = Cl-, 1952 Br-, or I-) was synthesized. Relative rates of hydrazine reduction with 1953 each catalyst were virtually identical, indicating little or no 1954 involvement of the Fe atoms during catalysis. The result's of this 1955 study strongly implicate the heterometal (V) as the site directly 1956 involved in the binding and activation of hydrazine. Additionally, 1957 reduction of phenylhydrazine to ammonia and aniline is observed in 1958 these systems. Importantly, the single cubane 1959 (Me(4)N)[(PhHNNH(2))(bpy)VFe3S4Cl3] has been synthesized, indicating 1960 the ability of a hydrazine-like substrate molecule to interact directly 1961 with the V atom. These reactivity studies are compared to those 1962 communicated previously for the reduction of hydrazine by the 1963 [MoFe3S4](3+) cuboidal core. Additionally, a plausible reaction pathway 1964 for the reduction of hydrazine-like substrates by the [VFe3S4](2+) core 1965 is presented. Implications regarding the function of the Fe/M/S (M = V, 1966 Mo) center in nitrogenase are discussed. 1967 C1 UNIV MICHIGAN,DEPT CHEM,ANN ARBOR,MI 48109. 1968 NR 45 1969 TC 53 1970 PU AMER CHEMICAL SOC 1971 PI WASHINGTON 1972 PA PO BOX 57136, WASHINGTON, DC 20037-0136 1973 SN 0002-7863 1974 J9 J AMER CHEM SOC 1975 JI J. Am. Chem. Soc. 1976 PD MAR 22 1977 PY 1995 1978 VL 117 1979 IS 11 1980 BP 3126 1981 EP 3133 1982 PG 8 1983 SC Chemistry, Multidisciplinary 1984 GA QN458 1985 UT ISI:A1995QN45800017 1986 ER 1987 1988 1989 PT J 1990 AU DENISOV, NT 1991 SHUVALOVA, NI 1992 SHILOV, AE 1993 TI A KINETIC-STUDY OF A VANADIUM(II)-MAGNESIUM HYDROXIDE SYSTEM 1994 SO KINETICS AND CATALYSIS 1995 LA English 1996 DT Article 1997 ID REDUCTION; NITROGEN 1998 AB The kinetics of the molecular nitrogen reduction of hydrazine by 1999 vanadium(II)-magnesium hydroxide is studied at P(N)2 = 0.506 - 3.54 MPa 2000 and 258 - 284 K. The heat (-DELTAH = 17 kJ/mol) and entropy of the 2001 formation of the nitrogen complex (-DELTAS = 32 J mol-1 K-1) and the 2002 activation energy of the N2H4 formation (35 kJ/mol) are determined. 2003 The conclusion is made that the reaction occurs with the participation 2004 of a tetranuclear cluster of V2+ ions in the cationic layer of the 2005 primary particle of the mixed hydroxide Mg(OH)2-V(OH)2. 2006 RP DENISOV, NT, RUSSIAN ACAD SCI,INST CHEM PHYS,CHERNO 142432,RUSSIA. 2007 NR 16 2008 TC 6 2009 PU MAIK NAUKA/INTERPERIODICA 2010 PI NEW YORK 2011 PA C/O PLENUM/CONSULTANTS BUREAU 233 SPRING ST, NEW YORK, NY 10013 2012 SN 0023-1584 2013 J9 KINET CATAL-ENGL TR 2014 JI Kinet. Catal. 2015 PD SEP-OCT 2016 PY 1994 2017 VL 35 2018 IS 5 2019 BP 700 2020 EP 704 2021 PG 5 2022 SC Chemistry, Physical 2023 GA PR892 2024 UT ISI:A1994PR89200016 2025 ER 2026 2027 2028 PT J 2029 AU HWANG, JS 2030 ALTURABI, MOH 2031 ELSAYED, L 2032 TI EPR AND SPECTROSCOPIC STUDIES OF 2033 BIS(S-METHYL-3-ISOPROPYLIDENEHYDRAZINECARBODITHIOATO)-OXOVANADIUM(IV) 2034 AS MODEL-COMPOUND FOR VANADIUM BOUND TO NITROGEN AND SULFUR HETEROATOMS 2035 SO ENERGY & FUELS 2036 LA English 2037 DT Article 2038 ID COORDINATION-COMPOUNDS; HYDRAZINE DERIVATIVES; TRANSITION-METALS; 2039 RESONANCE; COMPLEXES; ACID 2040 AB The synthesis and spectroscopic and EPR characterization of a vanadyl 2041 complex with acetone Schiff base, 2042 bis(S-methyl-3-isopropylidenehydrazinecarbodithioato)oxovanadium(IV), 2043 are described. The magnetic moment of 1.75 mu(B) at room temperature is 2044 close to the spin only magnetic moment (1.73 mu(B)). The experimental 2045 values of g(parallel-to) = 1.960 and g(perpendicular-to) = 1.988 and 2046 the normal occurence of nu(V=O) vibration suggest a monomeric 2047 five-coordinate square pyramical structure of the complex. A 2048 correlation was found between g(parallel-to) and A(parallel-to) of the 2049 title compound when compared with other model compounds of the vanadyl 2050 complexes in which possible combinations of four ligands may include 2051 all nitrogen (N4) and all sulfur (S4). This information could be useful 2052 in characterizing aqueous pyridine cuts of asphaltenes with molecular 2053 weights less than 400 found in some heavy crude oils. 2054 C1 ALEXANDRIA UNIV,FAC SCI,DEPT CHEM,ALEXANDRIA 21321,EGYPT. 2055 RP HWANG, JS, KING FAHD UNIV PETR & MINERALS,DEPT CHEM,DHAHRAN 31261,SAUDI 2056 ARABIA. 2057 NR 24 2058 TC 3 2059 PU AMER CHEMICAL SOC 2060 PI WASHINGTON 2061 PA 1155 16TH ST, NW, WASHINGTON, DC 20036 2062 SN 0887-0624 2063 J9 ENERG FUEL 2064 JI Energy Fuels 2065 PD MAY-JUN 2066 PY 1994 2067 VL 8 2068 IS 3 2069 BP 793 2070 EP 797 2071 PG 5 2072 SC Energy & Fuels; Engineering, Chemical 2073 GA NN798 2074 UT ISI:A1994NN79800039 2075 ER 2076 2077 2078 PT J 2079 AU SUNDHEIM, A 2080 THEERS, C 2081 MATTES, R 2082 TI SUBSTITUTED HYDRAZINES AS LIGANDS IN VANADIUM(III), VANADIUM(IV) AND 2083 VANADIUM(V) COMPLEXES - SYNTHESIS AND CHARACTERIZATION OF 2084 [V(DIPIC)(NH(2)NHCOPH)(H2O)][VO(DIPIC)(NHNCOPH)]CENTER-DOT-2H(2)O, 2085 [VO(DIPIC)(NHNHCO(2)ME)], 2086 [VO(DIPIC)(NH(2)NHCO(2)ME)],[VO(DIPIC)(NHNHCSPH)] AND 2087 [VO(ONO)(NHNHCOPH)]CENTER-DOT-2H(2)O 2088 SO ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2089 LA German 2090 DT Article 2091 DE BENZOLHYDRAZINE COMPLEXES OF VANADIUM(III) AND -(V); METHYLCARBAZATE 2092 COMPLEXES OF VANADIUM(IV) AND -(V); THIOBENZOYLHYDRAZINE COMPLEXES OF 2093 VANADIUM(V); CRYSTAL STRUCTURE 2094 ID DIAZENIDO COMPLEXES; DIOXOMOLYBDENUM(VI) COMPLEXES; 2095 MOLECULAR-STRUCTURES; METHYLTHIOCARBAZATE; MOLYBDENUM; CRYSTAL; OXO 2096 AB The reaction of [VO(dipic)(H2O)(2)].2H(2)O with benzoylhydrazine, 2097 thiobenzoylhydrazine and O-methylcarbazate yields 2098 [V(dipic)(NH(2)NHCOPh)(H2O)(2)][VO(dipic)(NHNCOPh). 2H(2)O (1), 2099 [VO(dipic)(NHNHCO(2)Me)] (2), [VO(dipic)(NH(2)NHCO(2)Me)] (3) and 2100 [VO(dipic)(NHNHCSPh)] (4). 1 is probably formed in solution by redox 2101 disproportionation. The reactions giving 2, 3 and 4 also involve redox 2102 processes with atmospheric oxygen as oxidant and the respective 2103 hydrazine as reductant. [VO('ONO')(NHNHCOPh)].H2O (5) was formed using 2104 aqua-oxo-salicylaldehyde-L-alaninato-vanadium(IV) as precursor. The 2105 structures of 1,2, 3 and 5 have been determined by single crystal X-ray 2106 crystallography. 2107 The cation of 1 has a seven-coordinated vanadium(III) center with the 2108 two H2O molecules at the apices of a pentagonal bipyramide, the anion 2109 contains the doubly deprotonated hydrazido(2-) ligand NHNCOPh(2-) as 2110 N,O-chelate. 2 and 3 have very similar structures, but differ in the 2111 oxidation state of the vanadium atom and in the degree of deprotonation 2112 of the hydrazine. In 3 neutral NH(2)NHCOOMe and in 2 the single 2113 deprotonated hydrazido(1-) ligand NHNHCOOMe- are bound as N,O-chelates, 2114 with the O-donor in trans-position to the VO group. The remaining 2115 coordination sites are occupied by the ONO-donating dinegative dipic 2116 ligand. 5, where dipic is replaced by the three-dentate 2117 salicylaldehyde-benzoyl-hydrazone, has a very similar structure to 2. 4 2118 with a VO3N2S coordination sphere is the first vanadium(V) complex 2119 containing the N,S-donating hydrazido(1-) ligand NHNHCSPh(-). The 2120 following parameters are characteristic for the bonding of the NHNHR(-) 2121 and NHNR(2-) ligands in 1, 2 and 5: V-N 189 +/- 1 pm, N-N 134 +/- 1 pm 2122 and V-N-N 122 +/- 2 degrees. 2123 C1 WESTFAL WILHELMS UNIV,INST ANORGAN CHEM,D-48149 MUNSTER,GERMANY. 2124 NR 18 2125 TC 5 2126 PU VERLAG Z NATURFORSCH 2127 PI TUBINGEN 2128 PA POSTFACH 2645, W-7400 TUBINGEN, GERMANY 2129 SN 0932-0776 2130 J9 Z NATURFORSCH SECT B 2131 JI Z.Naturforsch.(B) 2132 PD FEB 2133 PY 1994 2134 VL 49 2135 IS 2 2136 BP 176 2137 EP 185 2138 PG 10 2139 SC Chemistry, Inorganic & Nuclear; Chemistry, Organic 2140 GA MY481 2141 UT ISI:A1994MY48100004 2142 ER 2143 2144 2145 PT J 2146 AU GUZMAN, R 2147 MORALES, J 2148 TIRADO, JL 2149 TI LITHIUM SOLVATION BY N-ALKYLAMINES IN THE INTERLAYER SPACE OF VANADIUM 2150 DISELENIDE 2151 SO SOLID STATE IONICS 2152 LA English 2153 DT Article 2154 ID TRANSITION-METAL DICHALCOGENIDES; INTERCALATION COMPLEXES; DISULFIDE; 2155 VSE2; TRANSPORT; HYDRAZINE; SULFIDES; TIS2 2156 AB Lithium and n-alkylamine molecules containing 1-16 carbon atoms were 2157 intercalated into layered vanadium diselenide. The reaction with amines 2158 is favoured by prior lithium intercalation. Alkylamines form double 2159 layers in the interlayer space between consecutive VSe2 slabs. Also, 2160 lithium is not exchanged with alkylammonium ions, but is largely 2161 retained in the form of solvated ions. The angle between the amine 2162 molecules and the host lattice layers is constant for the solvated ions 2163 but increases gradually with the size of the organic molecules in the 2164 alkylamine intercalates. 2165 RP GUZMAN, R, UNIV CORDOBA,FAC CIENCIAS,DEPT QIUM INORGAN & INGN QUIM,SAN 2166 ALBEROT MAGNO S-N,E-14004 CORDOBA,SPAIN. 2167 NR 33 2168 TC 0 2169 PU ELSEVIER SCIENCE BV 2170 PI AMSTERDAM 2171 PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS 2172 SN 0167-2738 2173 J9 SOLID STATE IONICS 2174 JI Solid State Ion. 2175 PD DEC 2176 PY 1993 2177 VL 67 2178 IS 1-2 2179 BP 107 2180 EP 113 2181 PG 7 2182 SC Chemistry, Physical; Physics, Condensed Matter 2183 GA MR295 2184 UT ISI:A1993MR29500015 2185 ER 2186 2187 2188 PT J 2189 AU TSAGKALIDIS, W 2190 WOITHA, C 2191 REHDER, D 2192 TI HYDRAZINE COMPLEXES OF VANADIUM(II AND III) 2193 SO INORGANICA CHIMICA ACTA 2194 LA English 2195 DT Article 2196 ID AZOTOBACTER-CHROOCOCCUM; CRYSTAL-STRUCTURE; VFE-PROTEIN; NITROGENASE; 2197 DINITROGEN; FIXATION; SPECTRUM; CHLORIDE; LIGANDS; ENZYME 2198 AB The reaction of VCl3(thf)3 (1) with NN-dimethylhydrazine yields 2199 VCl3(thf)2(H2NNMe2) (2) or, with excess hydrazine, VCl3(NH2NMe2)2 2200 (4). In the presence of 1,2-bis(dimethylphosphino)ethane 2201 (dmpe), VCl3(dmpe)(NH2NMe2).0.5thf (7) is obtained. As 1 is reacted 2202 with tris(3-dimethylphosphinopropyl)phosphine (tdmp) and lithium 2203 hydrazide, the V(II) species VCl2(tdmp)(NH2NMe2) (10) and VC]2(tdmp) 2204 (11) are formed. While H2NNMe2 coordinates end-on via its NH2 group in 2205 the case of 2, 7 and 10, 4 probably contains the two hydrazine ligands 2206 in a side-on bonding mode. The compounds were characterized by 2207 elemental analyses, IR, H-1 NMR and susceptibility measurements. The 2208 NH2 Protons are deshielded with respect to the free hydrazine by 3.8 to 2209 5.6 ppm. For comparison, the complexes VCl3(amine)x(thf), (amine = 2210 ethylenediamine, x and y = l, 5; tetramethylethylenediamine, x = 2, y = 2211 0, 6; N-aminopiperidine, x = 1, y = 2, 3) have also been prepared. 2212 C1 UNIV HAMBURG,DEPT CHEM,W-2000 HAMBURG 13,GERMANY. 2213 NR 21 2214 TC 15 2215 PU ELSEVIER SCIENCE SA LAUSANNE 2216 PI LAUSANNE 1 2217 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND 2218 SN 0020-1693 2219 J9 INORG CHIM ACTA 2220 JI Inorg. Chim. Acta 2221 PD MAR 15 2222 PY 1993 2223 VL 205 2224 IS 2 2225 BP 239 2226 EP 243 2227 PG 5 2228 SC Chemistry, Inorganic & Nuclear 2229 GA KV971 2230 UT ISI:A1993KV97100017 2231 ER 2232 2233 2234 PT J 2235 AU DILWORTH, MJ 2236 ELDRIDGE, ME 2237 EADY, RR 2238 TI THE MOLYBDENUM AND VANADIUM NITROGENASES OF AZOTOBACTER-CHROOCOCCUM - 2239 EFFECT OF ELEVATED-TEMPERATURE ON N2 REDUCTION 2240 SO BIOCHEMICAL JOURNAL 2241 LA English 2242 DT Article 2243 ID KLEBSIELLA-PNEUMONIAE; COMPONENT PROTEINS; PURIFICATION; COFACTOR; 2244 EVOLUTION; HYDRAZINE; HYDROGEN; ETHYLENE; PRODUCT; COMPLEX 2245 AB During the reduction of N, by V-nitrogenase at 30-degrees-C, some 2246 hydrazine (N2H4) is formed as a product in addition to NH3 [Dilworth 2247 and Eady (I 99 1) Biochem. J. 277, 465-468]. We show here the 2248 following. (1) That over the temperature range 30-45-degrees-C the 2249 apparent K(m) for the reduction of N2 to yield these products is the 2250 same, but increases from 30 to 58 kPa of N2. On increasing the 2251 temperature from 45-degrees-C to 50-degrees-C, little change occurred 2252 in the rate of reduction of protons to H-2; the rate of N2H4 production 2253 increased, but the rate of NH3 formation decreased 7-fold. (2) 2254 Temperature-shift experiments from 42 to 50-degrees-C or from 50 to 2255 42-degrees-C showed that this selective loss of the ability to reduce 2256 N2 to NH3 was reversible. The effects we observe are consistent with 2257 the existence of different conformers of the VFe-protein at the two 2258 temperatures, that predominating at 50-degrees-C being largely unable 2259 to reduce N2 to ammonia. (3) Measurement of the ratio between H-2 2260 evolution and N2 reduced to NH3 at N2 pressures up to 339 kPa for both 2261 Mo- and V-nitrogenases gave limiting H-2/N2 values of 1.13 +/- 0.13 for 2262 Mo-nitrogenase and 3.50 +/- 0.03 for V-nitrogenase. Since for 2263 Mo-nitrogenase our measured value for the ratio at 339 kPa is the same 2264 as that derived by Simpson and Buff is [(l 984) Science 224, 1095-1097] 2265 at 5650 kPa, there appears to be little or no divergence from the 2266 predictions based on the apparent K(m) for N2. These data then suggest 2267 that there may be a fundamentally different mechanism for N2 binding to 2268 V-nitrogenase compared with Mo-nitrogenase. (4) We did not detect any 2269 N2H4 as a product of N2 reduction by Mo-nitrogenase over the 2270 temperature range investigated; however, at 50-degrees-C this system 2271 reduced acetylene (C2H2) to yield some ethane (C2H6), in addition to 2272 ethylene (C2H4), a reaction normally associated with Mo-independent 2273 nitrogenases. 2274 C1 UNIV SUSSEX,AFRC,IPSR,NITROGEN FIXAT LAB,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND. 2275 RP DILWORTH, MJ, MURDOCH UNIV,SCH BIOL & ENVIRONM SCI,MURDOCH,WA 2276 6150,AUSTRALIA. 2277 NR 27 2278 TC 18 2279 PU PORTLAND PRESS 2280 PI LONDON 2281 PA 59 PORTLAND PLACE, LONDON, ENGLAND W1N 3AJ 2282 SN 0264-6021 2283 J9 BIOCHEM J 2284 JI Biochem. J. 2285 PD JAN 15 2286 PY 1993 2287 VL 289 2288 PN Part 2 2289 BP 395 2290 EP 400 2291 PG 6 2292 SC Biochemistry & Molecular Biology 2293 GA KJ143 2294 UT ISI:A1993KJ14300011 2295 ER 2296 2297 2298 PT J 2299 AU MAZZANTI, M 2300 KADKHODAYAN, M 2301 ARMSTRONG, WH 2302 TI CLEAVAGE OF THE HYDRAZINE N-N BOND BY VANADIUM(II) COMPLEXES 2303 SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 2304 LA English 2305 DT Meeting Abstract 2306 C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. 2307 NR 0 2308 TC 0 2309 PU AMER CHEMICAL SOC 2310 PI WASHINGTON 2311 PA 1155 16TH ST, NW, WASHINGTON, DC 20036 2312 SN 0065-7727 2313 J9 ABSTR PAP AMER CHEM SOC 2314 JI Abstr. Pap. Am. Chem. Soc. 2315 PD APR 5 2316 PY 1992 2317 VL 203 2318 PN Part 2 2319 BP 461 2320 EP INOR 2321 PG 0 2322 SC Chemistry, Multidisciplinary 2323 GA HK162 2324 UT ISI:A1992HK16200870 2325 ER 2326 2327 2328 PT J 2329 AU DILWORTH, MJ 2330 EADY, RR 2331 TI HYDRAZINE IS A PRODUCT OF DINITROGEN REDUCTION BY THE 2332 VANADIUM-NITROGENASE FROM AZOTOBACTER-CHROOCOCCUM 2333 SO BIOCHEMICAL JOURNAL 2334 LA English 2335 DT Article 2336 ID X-RAY ABSORPTION; VFE PROTEIN; COFACTOR; PURIFICATION; MOLYBDENUM; 2337 CONTAINS; ENZYME 2338 AB During the enzymic reduction of N2 to NH3 by Mo-nitrogenase, free 2339 hydrazine (N2H4) is not detectable, but an enzyme-bound intermediate 2340 can be made to yield N2H4 by quenching the enzyme during turnover 2341 [Thorneley, Eady & Lowe (1978) Nature (London) 272, 557-558]. In 2342 contrast, we show here that the V-nitrogenase of Azotobacter 2343 chroococcum produces a small but significant amount of free N2H4 (up to 2344 0.5% of the electron flux resulting in N2 reduction) as a product of 2345 the reduction of N2. The amount of N2H4 formed increased 15-fold on 2346 increasing the assay temperature from 20-degrees-C to 40-degrees-C. 2347 Activity cross-reactions between nitrogenase components of Mo- and 2348 V-nitrogenases showed that the formation of free N2H4 was associated 2349 with the VFe protein. These data provide the first direct evidence for 2350 an enzyme intermediate at the four-electron-reduced level during the 2351 reduction of N2 by V-nitrogenase. 2352 C1 UNIV SUSSEX,AFRC,INST PLANT SCI RES,NITROGEN FIXAT LAB,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND. 2353 MURDOCH UNIV,SCH BIOL & ENVIRONM SCI,MURDOCH,WA 6150,AUSTRALIA. 2354 NR 23 2355 TC 35 2356 PU PORTLAND PRESS 2357 PI LONDON 2358 PA 59 PORTLAND PLACE, LONDON, ENGLAND W1N 3AJ 2359 SN 0264-6021 2360 J9 BIOCHEM J 2361 JI Biochem. J. 2362 PD JUL 15 2363 PY 1991 2364 VL 277 2365 PN Part 2 2366 BP 465 2367 EP 468 2368 PG 4 2369 SC Biochemistry & Molecular Biology 2370 GA FX928 2371 UT ISI:A1991FX92800026 2372 ER 2373 2374 2375 PT J 2376 AU HILLS, A 2377 HUGHES, DL 2378 LEIGH, GJ 2379 SANDERS, JR 2380 TI REACTIONS OF VANADIUM(IV) HALIDE-COMPLEXES CONTAINING SCHIFF-BASE 2381 LIGANDS WITH HYDRAZINES - PREPARATION AND STRUCTURE OF 2382 [N,N'-ETHYLENEBIS(SALICYLIDENEIMINATO)]BIS-(PHENYLHYDRAZINE)VANADIUM(III 2383 ) IODIDE 2384 SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS 2385 LA English 2386 DT Article 2387 ID MOLECULAR-STRUCTURE; CRYSTAL 2388 AB The complexes [VX2L] [L = N,N' -ethylenebis(salicylideneiminate) 2389 (salen) or N,N' -1,2-phenylenebis-(salicylideneiminate)(salphen), X = 2390 Cl or Br] have been prepared by established routes, but attempts to 2391 prepare the iodo-analogue led to other products, including 2392 [(salen)V(mu-m-O)VO(salen)][l(5)]. It is not possible to prepare 2393 hydrazine or hydrazide complexes directly from the dihalides, but 2394 [V(NH2NHPh)2-(salen)]\ was synthesised by an indirect route, and its 2395 structure determined by X-ray analysis. The phenylhydrazines are bound 2396 end-on. Several other new vanadium-(lll) and (lV) species are 2397 described. 2398 RP HILLS, A, UNIV SUSSEX,AFRC,INST PLANT SCI RES,NITROGEN FIXAT 2399 LAB,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND. 2400 NR 13 2401 TC 19 2402 PU ROYAL SOC CHEMISTRY 2403 PI CAMBRIDGE 2404 PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, 2405 ENGLAND CB4 4WF 2406 SN 0300-9246 2407 J9 J CHEM SOC DALTON TRANS 2408 JI J. Chem. Soc.-Dalton Trans. 2409 PD FEB 2410 PY 1991 2411 IS 2 2412 BP 325 2413 EP 329 2414 PG 5 2415 SC Chemistry, Inorganic & Nuclear 2416 GA EX664 2417 UT ISI:A1991EX66400022 2418 ER 2419 2420 2421 PT J 2422 AU BULTITUDE, J 2423 LARKWORTHY, LF 2424 POVEY, DC 2425 SMITH, GW 2426 DILWORTH, JR 2427 LEIGHT, GJ 2428 TI THE CRYSTAL AND MOLECULAR-STRUCTURE OF 2429 BIS(1-METHYL-1-PHENYLHYDRAZINE)DICHLORO-(1-METHYL-1-PHENYLHYDRAZIDO(2-)) 2430 VANADIUM(V) CHLORIDE, A COMPLEX CONTAINING 2 SIDE-ON-CO-ORDINATED 2431 HYDRAZINE MOLECULES 2432 SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS 2433 LA English 2434 DT Article 2435 C1 UNIV SURREY,DEPT CHEM,GUILDFORD GU2 5XH,SURREY,ENGLAND. 2436 UNIV SUSSEX,AFRC,NITROGEN FIXAT UNIT,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND. 2437 NR 10 2438 TC 32 2439 PU ROYAL SOC CHEMISTRY 2440 PI CAMBRIDGE 2441 PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS, 2442 ENGLAND CB4 4WF 2443 SN 0022-4936 2444 J9 J CHEM SOC CHEM COMMUN 2445 JI J. Chem. Soc.-Chem. Commun. 2446 PD DEC 15 2447 PY 1986 2448 IS 24 2449 BP 1748 2450 EP 1750 2451 PG 3 2452 SC Chemistry, Multidisciplinary 2453 GA F5082 2454 UT ISI:A1986F508200003 2455 ER 2456 2457 2458 PT J 2459 AU RAMBABU, C 2460 RAO, RS 2461 RAO, PVK 2462 TI TITRIMETRIC METHOD FOR THE DETERMINATION OF NICOTINOYL HYDRAZINE WITH 2463 VANADIUM(V) 2464 SO CURRENT SCIENCE 2465 LA English 2466 DT Note 2467 C1 ANDHRA UNIV,POSTGRAD EXTENS CTR,DEPT CHEM,NUZVID 521201,INDIA. 2468 RP RAMBABU, C, ANDHRA UNIV,DEPT CHEM,WALTAIR 530003,ANDHRA PRADESH,INDIA. 2469 NR 15 2470 TC 1 2471 PU CURRENT SCIENCE ASSN 2472 PI BANGALORE 2473 PA C V RAMAN AVENUE, PO BOX 8005, BANGALORE 560 080, INDIA 2474 SN 0011-3891 2475 J9 CURR SCI 2476 JI Curr. Sci. 2477 PY 1984 2478 VL 53 2479 IS 10 2480 BP 527 2481 EP 528 2482 PG 2 2483 SC Multidisciplinary Sciences 2484 GA ST303 2485 UT ISI:A1984ST30300006 2486 ER 2487 2488 2489 PT J 2490 AU RAO, PVK 2491 RAMABABU, C 2492 RAO, RS 2493 TI PHOTOMETRIC TITRATION OF NICOTINOYL HYDRAZINE WITH QUINQUIVALENT 2494 VANADIUM 2495 SO NATIONAL ACADEMY SCIENCE LETTERS-INDIA 2496 LA English 2497 DT Article 2498 RP RAO, PVK, ANDHRA UNIV,DEPT CHEM,WALTAIR 530003,ANDHRA PRADESH,INDIA. 2499 NR 7 2500 TC 0 2501 PU NATL ACAD SCIENCES INDIA 2502 PI ALLAHABAD 2503 PA 5 LAJPATRAI RD, ALLAHABAD 211002, INDIA 2504 SN 0250-541X 2505 J9 NATL ACAD SCI LETT 2506 JI Natl. Acad. Sci. Lett.-India 2507 PY 1980 2508 VL 3 2509 IS 5 2510 BP 150 2511 EP 152 2512 PG 3 2513 SC Multidisciplinary Sciences 2514 GA LH199 2515 UT ISI:A1980LH19900006 2516 ER 2517 2518 2519 PT J 2520 AU SHAROV, VA 2521 POVAROVA, NV 2522 KRYLOV, EI 2523 TI MECHANISM OF THERMAL-DECOMPOSITION OF TITANIUM, VANADIUM AND CHROMIUM 2524 OXALATES AND THEIR COMPLEXES WITH HYDRAZINE 2525 SO ZHURNAL NEORGANICHESKOI KHIMII 2526 LA Russian 2527 DT Article 2528 RP SHAROV, VA, NIZHNI TAGIL STATE TEACHERS INST,NIZHNI TAGIL,USSR. 2529 NR 21 2530 TC 2 2531 PU INST OBS NEORG KHIMII 2532 PI MOSCOW 2533 PA IM N S KURNAKOVA LENINSKI PROSPEKT 31, 71 MOSCOW, RUSSIA 2534 SN 0044-457X 2535 J9 ZH NEORG KHIM 2536 JI Zhurnal Neorg. Khimii 2537 PY 1980 2538 VL 25 2539 IS 8 2540 BP 2153 2541 EP 2157 2542 PG 5 2543 SC Chemistry, Inorganic & Nuclear 2544 GA KE082 2545 UT ISI:A1980KE08200025 2546 ER 2547 2548 2549 PT J 2550 AU STUKLOVA, MS 2551 PECHUROVA, NI 2552 SPITSYN, VI 2553 TI REACTION OF VANADIUM(V) WITH HYDRAZINE SULFATE IN THE PRESENCE OF 2554 CERTAIN COMPLEXONES 2555 SO BULLETIN OF THE ACADEMY OF SCIENCES OF THE USSR DIVISION OF CHEMICAL 2556 SCIENCE 2557 LA English 2558 DT Article 2559 RP STUKLOVA, MS, MV LOMONOSOV STATE UNIV,MOSCOW 117234,USSR. 2560 NR 9 2561 TC 1 2562 PU PLENUM PUBL CORP 2563 PI NEW YORK 2564 PA CONSULTANTS BUREAU, 233 SPRING ST, NEW YORK, NY 10013 2565 SN 0568-5230 2566 J9 BULL ACAD SCI USSR D CHEM SCI 2567 PY 1979 2568 VL 28 2569 IS 9 2570 BP 1791 2571 EP 1794 2572 PG 4 2573 SC Chemistry, Multidisciplinary 2574 GA JV726 2575 UT ISI:A1979JV72600002 2576 ER 2577 2578 2579 PT J 2580 AU SHEETS, RW 2581 BLYHOLDER, G 2582 TI ISOCYANATE FORMATION FROM ADSORBED CARBON-MONOXIDE AND AMMONIA OR 2583 HYDRAZINE ON VANADIUM, IRON, AND NICKEL 2584 SO JOURNAL OF PHYSICAL CHEMISTRY 2585 LA English 2586 DT Article 2587 C1 SW MISSOURI STATE UNIV,DEPT CHEM,SPRINGFIELD,MO 65802. 2588 NR 12 2589 TC 8 2590 PU AMER CHEMICAL SOC 2591 PI WASHINGTON 2592 PA 1155 16TH ST, NW, WASHINGTON, DC 20036 2593 SN 0022-3654 2594 J9 J PHYS CHEM 2595 JI J. Phys. Chem. 2596 PY 1975 2597 VL 79 2598 IS 15 2599 BP 1572 2600 EP 1573 2601 PG 2 2602 SC Chemistry, Physical 2603 GA AJ594 2604 UT ISI:A1975AJ59400020 2605 ER 2606 2607 2608 PT J 2609 AU WAHREN, M 2610 TI INFLUENCE OF ANIONS ON REDUCTION OF N2 TO HYDRAZINE USING 2611 VANADIUM(II)-MAGNESIUM(II) IN AQUEOUS-SOLUTION 2612 SO ZEITSCHRIFT FUR CHEMIE 2613 LA German 2614 DT Note 2615 C1 DAWB,ZENT INST ISOTOPEN & STRAHLENFORSCH,PERMOSER STR 15,705 LEIPZIG,GER DEM REP. 2616 NR 12 2617 TC 1 2618 PU DEUTSCHER VERLAG FUR GRUNDSTOFFINDUSTRIE 2619 PI LEIPZIG 2620 PA KARL HEINE STR 27B, 04229 LEIPZIG, GERMANY 2621 SN 0044-2402 2622 J9 Z CHEM 2623 PY 1975 2624 VL 15 2625 IS 6 2626 BP 242 2627 EP 243 2628 PG 2 2629 SC Chemistry, Multidisciplinary 2630 GA AJ208 2631 UT ISI:A1975AJ20800026 2632 ER 2633 2634 2635 PT J 2636 AU ROMANOV, VF 2637 TI EFFECT OF ETHANOL ON CATALYTIC PROPERTIES OF VANADIUM(V) COMPOUNDS IN 2638 REACTION OF HYDRAZINE OXIDATION BY CERIUM(IV) SULFATE 2639 SO UKRAINSKII KHIMICHESKII ZHURNAL 2640 LA Russian 2641 DT Article 2642 C1 LV PISARZHEVSKII PHYS CHEM INST,KIEV,UKSSR. 2643 NR 14 2644 TC 0 2645 PU ACADEMY SCIENCE UKRAINE 2646 PI KIEV 22 2647 PA PROSPECT SCIENCE 46,MSP, KIEV 22, UKRAINE 252650 2648 SN 0041-6045 2649 J9 UKR KHIM ZH 2650 PY 1975 2651 VL 41 2652 IS 2 2653 BP 115 2654 EP 119 2655 PG 5 2656 SC Chemistry, Multidisciplinary 2657 GA V7077 2658 UT ISI:A1975V707700001 2659 ER 2660 2661 2662 PT J 2663 AU SINGH, HM 2664 GYANI, BP 2665 TI OXIDATION OF PHENYL HYDRAZINE BY VANADIUM (V) IN AQUEOUS SULFURIC-ACID 2666 MEDIUM 2667 SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION 2668 A-PHYSICAL SCIENCES 2669 LA English 2670 DT Article 2671 C1 RANCHI UNIV,DEPT CHEM,RANCHI 8,INDIA. 2672 NR 10 2673 TC 0 2674 PU NATL ACAD SCIENCES INDIA 2675 PI ALLAHABAD 2676 PA 5 LAJPATRAI RD, ALLAHABAD 211002, INDIA 2677 J9 PROC NAT ACAD SCI INDIA A 2678 PY 1971 2679 VL 41 2680 BP 225 2681 EP 229 2682 PG 5 2683 SC Physics, Multidisciplinary 2684 GA U2605 2685 UT ISI:A1971U260500014 2686 ER 2687 2688 2689 PT J 2690 AU DOLGOREV, AV 2691 LUKACHIN.VV 2692 KARPOVA, OI 2693 TI USE OF HYDRAZINE DERIVATIVES IN ANALYTICAL-CHEMISTRY - REACTION OF 2694 VANADIUM WITH ANTHRANILIC ACID ACETONEHYDRAZIDE 2695 SO ZHURNAL ANALITICHESKOI KHIMII 2696 LA Russian 2697 DT Article 2698 C1 MOSCOW MINEROL GEOCHEM & RARE ELEMENT CRYST INST,MOSCOW,USSR. 2699 NR 11 2700 TC 0 2701 SN 0044-4502 2702 J9 ZH ANAL KHIM 2703 PY 1974 2704 VL 29 2705 IS 4 2706 BP 721 2707 EP 725 2708 PG 5 2709 SC Chemistry, Analytical 2710 GA S8267 2711 UT ISI:A1974S826700015 2712 ER 2713 2714 2715 PT J 2716 AU RAO, PVK 2717 RAO, GG 2718 TI POTENTIOMETRIC AND PHOTOMETRIC TITRATION OF VANADIUM(V) AND 2719 CHROMIUM(VI) WITH HYDRAZINE SULFATE 2720 SO INDIAN JOURNAL OF CHEMISTRY 2721 LA English 2722 DT Article 2723 C1 ANDHRA UNIV,DEPT CHEM,WALTAIR,INDIA. 2724 NR 20 2725 TC 1 2726 PU COUNCIL SCIENTIFIC INDUSTRIAL RESEARCH 2727 PI NEW DELHI 2728 PA PUBL & INFO DIRECTORATE, NEW DELHI 110012, INDIA 2729 J9 INDIAN J CHEM 2730 PY 1973 2731 VL 11 2732 IS 12 2733 BP 1309 2734 EP 1311 2735 PG 3 2736 SC Chemistry, Multidisciplinary 2737 GA S5887 2738 UT ISI:A1973S588700031 2739 ER 2740 2741 2742 PT J 2743 AU SOKOLSKI.DV 2744 DORFMAN, YA 2745 SHINDLER, YM 2746 EMELYANO.VS 2747 TI EFFECT OF ZINC(II) ON MAGNESIUM REDUCTION OF NITROGEN TO HYDRAZINE IN 2748 PRESENCE OF VANADIUM COMPOUNDS 2749 SO ZHURNAL NEORGANICHESKOI KHIMII 2750 LA Russian 2751 DT Note 2752 C1 ACAD SCI KASSR,ORG CATALYSIS & ELECTROCHEM INST,ALMA ATA,KASSR. 2753 NR 7 2754 TC 0 2755 PU INST OBS NEORG KHIMII 2756 PI MOSCOW 2757 PA IM N S KURNAKOVA LENINSKI PROSPEKT 31, 71 MOSCOW, RUSSIA 2758 SN 0044-457X 2759 J9 ZH NEORG KHIM 2760 JI Zhurnal Neorg. Khimii 2761 PY 1973 2762 VL 18 2763 IS 11 2764 BP 3135 2765 EP 3136 2766 PG 2 2767 SC Chemistry, Inorganic & Nuclear 2768 GA R2647 2769 UT ISI:A1973R264700058 2770 ER 2771 2772 2773 PT J 2774 AU RAO, PVK 2775 RAO, GG 2776 TI HYDRAZINE SULFATE AS REAGENT FOR TITRIMETRIC DETERMINATION OF 2777 VANADIUM(V) AND CHROMIUM(VI) 2778 SO TALANTA 2779 LA English 2780 DT Note 2781 C1 ANDHRA UNIV,DEPT CHEM,WALTAIR 530003,INDIA. 2782 NR 18 2783 TC 3 2784 PU ELSEVIER SCIENCE BV 2785 PI AMSTERDAM 2786 PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS 2787 SN 0039-9140 2788 J9 TALANTA 2789 JI Talanta 2790 PY 1973 2791 VL 20 2792 IS 9 2793 BP 907 2794 EP 910 2795 PG 4 2796 SC Chemistry, Analytical 2797 GA Q6495 2798 UT ISI:A1973Q649500017 2799 ER 2800 2801 2802 PT J 2803 AU RAO, GG 2804 RAO, PVK 2805 TI TITRIMETRIC DETERMINATION OF VANADIUM(V) AND CHROMIUM(VI) ALONE AND IN 2806 MIXTURES WITH HYDRAZINE SULFATE IN PHOSPHORIC-ACID MEDIA 2807 SO ANALYTICA CHIMICA ACTA 2808 LA English 2809 DT Article 2810 C1 ANDHRA UNIV,DEPT CHEM,WALTAIR,INDIA. 2811 NR 21 2812 TC 5 2813 PU ELSEVIER SCIENCE BV 2814 PI AMSTERDAM 2815 PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS 2816 SN 0003-2670 2817 J9 ANAL CHIM ACTA 2818 JI Anal. Chim. Acta 2819 PY 1973 2820 VL 65 2821 IS 2 2822 BP 347 2823 EP 356 2824 PG 10 2825 SC Chemistry, Analytical 2826 GA Q2066 2827 UT ISI:A1973Q206600012 2828 ER 2829 2830 2831 PT J 2832 AU ROMANOV, VF 2833 KONISHEV.GA 2834 YATSIMIR.KB 2835 TI CATALYTIC PROPERTIES OF OSMIUM COMPOUNDS - OXIDATION OF VANADIUM SODIUM 2836 HYDRAZINE 2837 SO ZHURNAL NEORGANICHESKOI KHIMII 2838 LA Russian 2839 DT Article 2840 C1 LV PISARZHEVSKII PHYS CHEM INST,KIEV,UKSSR. 2841 NR 19 2842 TC 3 2843 PU INST OBS NEORG KHIMII 2844 PI MOSCOW 2845 PA IM N S KURNAKOVA LENINSKI PROSPEKT 31, 71 MOSCOW, RUSSIA 2846 SN 0044-457X 2847 J9 ZH NEORG KHIM 2848 JI Zhurnal Neorg. Khimii 2849 PY 1972 2850 VL 17 2851 IS 12 2852 BP 3300 2853 EP 3305 2854 PG 6 2855 SC Chemistry, Inorganic & Nuclear 2856 GA O1922 2857 UT ISI:A1972O192200028 2858 ER 2859 2860 2861 PT J 2862 AU PRASAD, RK 2863 KUMAR, A 2864 TI OXIDATION OF HYDRAZINE BY VANADIUM 2865 SO JOURNAL OF THE INDIAN CHEMICAL SOCIETY 2866 LA English 2867 DT Note 2868 NR 5 2869 TC 4 2870 PU INDIAN CHEMICAL SOC 2871 PI CALCUTTA 2872 PA 92 ACHARYA PRAFULLA CHANDRA RD ATTN:DR INDRAJIT KAR/EXEC SEC, CALCUTTA 2873 700009, INDIA 2874 SN 0019-4522 2875 J9 J INDIAN CHEM SOC 2876 JI J. Indian Chem. Soc. 2877 PY 1972 2878 VL 49 2879 IS 8 2880 BP 819 2881 EP & 2882 PG 0 2883 SC Chemistry, Multidisciplinary 2884 GA N6271 2885 UT ISI:A1972N627100018 2886 ER 2887 2888 2889 PT J 2890 AU SOKOLSKI.DV 2891 SAPOVA, RG 2892 SHINDLER, YM 2893 DORFMAN, YA 2894 NOGERBEK.BY 2895 TI NITROGEN REDUCTION TO HYDRAZINE BY ZINC IN PRESENCE OF VANADIUM AND 2896 MAGNESIUM COMPOUNDS 2897 SO ZHURNAL OBSHCHEI KHIMII 2898 LA Russian 2899 DT Article 2900 NR 9 2901 TC 5 2902 PU MEZHDUNARODNAYA KNIGA 2903 PI MOSCOW 2904 PA 39 DIMITROVA UL., 113095 MOSCOW, RUSSIA 2905 SN 0044-460X 2906 J9 ZH OBSHCH KHIM 2907 JI Zhurnal Obshchei Khimii 2908 PY 1972 2909 VL 42 2910 IS 7 2911 BP 1425 2912 EP & 2913 PG 0 2914 SC Chemistry, Multidisciplinary 2915 GA N0660 2916 UT ISI:A1972N066000001 2917 ER 2918 2919 2920 PT J 2921 AU ROMANOV, VF 2922 TI CATALYTIC PROPERTIES OF VANADIUM(V) COMPOUNDS IN REACTION OF HYDRAZINE 2923 OXIDATION WITH CERIUM(V) SULFATE 2924 SO UKRAINSKII KHIMICHESKII ZHURNAL 2925 LA Russian 2926 DT Article 2927 NR 17 2928 TC 1 2929 PU ACADEMY SCIENCE UKRAINE 2930 PI KIEV 22 2931 PA PROSPECT SCIENCE 46,MSP, KIEV 22 252650, UKRAINE 2932 SN 0041-6045 2933 J9 UKR KHIM ZH 2934 PY 1972 2935 VL 38 2936 IS 2 2937 BP 132 2938 EP & 2939 PG 0 2940 SC Chemistry, Multidisciplinary 2941 GA L9303 2942 UT ISI:A1972L930300006 2943 ER 2944 2945 2946 PT J 2947 AU BENGTSSO.G 2948 TI KINETIC STUDY OF REDUCTION OF VANADIUM(V) BY HYDRAZINE IN STRONGLY ACID 2949 AQUEOUS SOLUTIONS 2950 SO ACTA CHEMICA SCANDINAVICA 2951 LA English 2952 DT Article 2953 NR 6 2954 TC 9 2955 PU MUNKSGAARD INT PUBL LTD 2956 PI COPENHAGEN 2957 PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK 2958 SN 0904-213X 2959 J9 ACTA CHEM SCAND 2960 JI Acta Chem. Scand. 2961 PY 1971 2962 VL 25 2963 IS 8 2964 BP 2989 2965 EP & 2966 PG 0 2967 SC Biochemistry & Molecular Biology; Chemistry, Multidisciplinary 2968 GA L2221 2969 UT ISI:A1971L222100021 2970 ER 2971 2972 2973 PT J 2974 AU DESHMUKH, GS 2975 BAPAT, MG 2976 TI BROMOMETRIC DETERMINATION OF VANADIUM(V) BY HYDRAZINE 2977 SO ANALYTICA CHIMICA ACTA 2978 LA English 2979 DT Article 2980 NR 7 2981 TC 4 2982 PU ELSEVIER SCIENCE BV 2983 PI AMSTERDAM 2984 PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS 2985 SN 0003-2670 2986 J9 ANAL CHIM ACTA 2987 JI Anal. Chim. Acta 2988 PY 1956 2989 VL 14 2990 IS 3 2991 BP 225 2992 EP 227 2993 PG 3 2994 SC Chemistry, Analytical 2995 GA WM047 2996 UT ISI:A1956WM04700005 2997 ER 2998 2999 3000 EF