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 Notes: hydrazine and vanadium
 
 
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 PT J
 AU Sarkar, A
    Pal, S
 AF Sarkar, Anindita
    Pal, Samudranil
 TI Some ternary complexes of oxovanadium(IV) with acetylacetone and
    N-(2-pyridyl)-N '-(salicylidene)hydrazine and its derivatives
 SO POLYHEDRON
 LA English
 DT Article
 DE oxovanadium(IV); ternary complexes; EPR spectra; crystal structures;
    self-assembly
 ID SCHIFF-BASE LIGAND; VANADIUM COMPLEXES; COORDINATION CHEMISTRY; VO2+
    COMPLEXES; REDOX
 AB The reactions of one equivalent each of [VO(acac)(2)] and
    N-(2-pyridyl)-N'-(5-R-salicylidene)hydrazines (HphsalR) (derived front
    2-hydrazinopyridine and 5-substituted salicylaldehydes) in boiling
    acetonitrile under aerobic conditions provide ternary complexes of
    oxovanadium(IV) having the general formula [VO(phsalR)(acac)]. The
    complexes have been characterized by analytical, magnetic and
    spectroscopic measurements. The structures of two representative
    complexes have been determined by X-ray crystallography. In each
    structure, the metal centre is in a distorted octahedral N2O4
    coordination sphere. The tridentate phsalR(-) coordinates the metal ion
    via the pyridine-N, the imine-N and the phenolate-O atoms in a
    meridional fashion. The remaining three coordinations sites are
    occupied by the bidentate O,O-donor acetylacetonate (acac(-)) and the
    oxo group. In the crystal lattice, the molecules of each of the two
    complexes assemble to form one-dimensional supramolecular structure via
    intermolecular N-H center dot center dot center dot O=V hydrogen bond
    interaction. Electronic spectra collected using dimethylsulfoxide
    solutions of the complexes display a weak absorption within 643-720 nm
    due to d-d transition and some strong absorptions in the range 510-262
    nm due to ligand-to-metal charge transfer and ligand centred
    transitions. The room temperature (298 K) effective magnetic moments of
    the complexes in the solid state are consistent with an S = 1/2 ground
    state of the metal ion in each complex. All the complexes display axial
    EPR spectra with well-resolved V-51 hyperfine structure characteristic
    of an axially compressed octahedral coordination geometry around the
    metal centre. (C) 2005 Elsevier Ltd. All rights reserved.
 C1 Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh, India.
 RP Pal, S, Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh,
    India.
 EM spsc@uohyd.ernet.in
 NR 26
 TC 0
 PU PERGAMON-ELSEVIER SCIENCE LTD
 PI OXFORD
 PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
 SN 0277-5387
 J9 POLYHEDRON
 JI Polyhedron
 PD MAY 8
 PY 2006
 VL 25
 IS 7
 BP 1689
 EP 1694
 PG 6
 SC Chemistry, Inorganic & Nuclear; Crystallography
 GA 045XJ
 UT ISI:000237775700028
 ER
 
 
 PT J
 AU Chu, WC
    Wu, CC
    Hsu, HF
 TI Catalytic reduction of hydrazine to ammonia by a vanadium thiolate
    complex
 SO INORGANIC CHEMISTRY
 LA English
 DT Article
 ID BIOLOGICAL NITROGEN-FIXATION; N-N BOND; DINITROGEN FIXATION; DIRECT
    INVOLVEMENT; POSSIBLE RELEVANCE; DIVALENT VANADIUM; LIGAND; CLEAVAGE;
    DISPROPORTIONATION; INTERMEDIATE
 AB Vanadium(III) thiolate complexes, [V(PS3")(Cl)]- [1a; PS3" =
    P(C6H3-3-(MeSi)-Si-3-2-S)(3)(3-)] and [V(PS3')(Cl)]- [1b; PS3' =
    P(C6H3-5-Me-2-S)3(3-)], were synthesized and characterized. Complex la
    serves as a precursor for the catalytic reduction of hydrazine to
    ammonia. The spectroscopic and electrochemical studies indicate that
    hydrazine is bound and activated in a V-II state.
 C1 Natl Cheng Kung Univ, Dept Chem, Tainan 701, Taiwan.
 RP Hsu, HF, Natl Cheng Kung Univ, Dept Chem, Tainan 701, Taiwan.
 EM konopka@mail.ncku.edu.tw
 NR 29
 TC 0
 PU AMER CHEMICAL SOC
 PI WASHINGTON
 PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
 SN 0020-1669
 J9 INORG CHEM
 JI Inorg. Chem.
 PD APR 17
 PY 2006
 VL 45
 IS 8
 BP 3164
 EP 3166
 PG 3
 SC Chemistry, Inorganic & Nuclear
 GA 034WJ
 UT ISI:000236961000009
 ER
 
 
 PT J
 AU Baunemann, A
    Kim, Y
    Winter, M
    Fischer, RA
 TI Mixed hydrazido amido/imido complexes of tantalum, hafnium and
    zirconium: potential precursors for metal nitride MOCVD
 SO DALTON TRANSACTIONS
 LA English
 DT Article
 ID CHEMICAL-VAPOR-DEPOSITION; SINGLE-SOURCE PRECURSORS; THIN-FILMS;
    ORGANOIMIDO COMPLEXES; GATE-ELECTRODE; NIOBIUM; TITANIUM; BEHAVIOR;
    VANADIUM; CRYSTAL
 AB The coordination chemistry of the hydrazine derivatives
    dimethylhydrazine (Hdmh) and N-trimethylsilyl-N'N'-dimethylhydrazine
    (Htdmh) at Ta, Zr and Hf was investigated aiming at volatile mixed
    ligand all-nitrogen coordinated compounds. The hydrazido ligands were
    introduced either by salt metathesis employing the Li salts of the
    hydrazines and the tetrachlorides MCl4 (M = Zr, Hf) or by amine
    substitution using M(NR2)(4) (R = Me, Et) and [(t-BuN)Ta(NR2)(3)]. The
    new complexes were fully characterised including H-1/C-13 NMR, mass
    spectrometry and a study of their thermal behaviour. The crystal
    structures of [ZrCl(tdmh)(3)] and the all-nitrogen coordinated complex
    [Ta(N-t-Bu)(NMe2)(2)-(tdmh)] are discussed as well as the structure of
    the by-product [Li(tdmh)(py)](2). Preliminary MOCVD experiments of the
    liquid compound [Ta(NEt2)(2)(N-t-Bu)(tdmh)] were performed and the
    deposited TaN(Si) films were analysed by RBS and SEM.
 C1 Ruhr Univ Bochum, Lehrstuhl Anorgan Chem Organomet & Mat Chem 2, D-4630 Bochum, Germany.
 RP Fischer, RA, Ruhr Univ Bochum, Lehrstuhl Anorgan Chem Organomet & Mat
    Chem 2, Univ Str 150, D-4630 Bochum, Germany.
 EM roland.fischer@ruhr-uni-bochum.de
 NR 34
 TC 1
 PU ROYAL SOC CHEMISTRY
 PI CAMBRIDGE
 PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
    ENGLAND
 SN 1477-9226
 J9 DALTON TRANS
 JI Dalton Trans.
 PY 2006
 IS 1
 BP 121
 EP 128
 PG 8
 SC Chemistry, Inorganic & Nuclear
 GA 993PU
 UT ISI:000233968200013
 ER
 
 
 PT J
 AU Tripathi, VS
    Manjanna, J
    Venkateswaran, G
    Gokhale, BK
    Balaji, V
 TI Electrolytic preparation of vanadium(II) formate in pilot-plant scale
    using stainless steel mesh electrodes: Dissolution of
    alpha-Fe2O3/Fe1.6Cr0.4O3 in an aqueous V-II-NTA complex
 SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
 LA English
 DT Article
 ID SUBSTITUTED IRON-OXIDES; CARBON-PASTE ELECTRODE; DECONTAMINATION; ION
 AB The chemical formulations containing strong reducing agents such as
    V(II) are kinetically effective for the reductive dissolution of iron
    oxides such as Fe3O4, Fe2O3, etc. To develop a methodology for
    large-scale synthesis of V(II), we report here the details of an
    electrolytic preparation on a pilot-plant scale (50 L). It is
    demonstrated that, by using stainless steel mesh cathode and anode in a
    poly(tetrafluoroethylene)-lined stainless steel tank, V(II) could be
    prepared. To minimize the electrolysis duration for the conversion of
    V(V) to V(II), laboratory studies are carried out for a preliminary
    reduction of V(V) to V(IV) with hydrazine or ascorbic acid and then
    employing V(IV) for electrolysis. Here, the use of hydrazine was
    advantageous (30% less time) over that of ascorbic acid. The V(II)
    obtained was complexed with nitrilotriacetic acid (NTA), and its
    stability and dissolution kinetics of Fe2O3 and Fe1.6Cr04O3 in the
    V-II-NTA formulation are reported.
 C1 Bhabha Atom Res Ctr, Div Appl Chem, Bombay 400085, Maharashtra, India.
 RP Venkateswaran, G, Bhabha Atom Res Ctr, Div Appl Chem, Bombay 400085,
    Maharashtra, India.
 EM gvenk@magnum.barc.ernet.in
 NR 24
 TC 1
 PU AMER CHEMICAL SOC
 PI WASHINGTON
 PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
 SN 0888-5885
 J9 IND ENG CHEM RES
 JI Ind. Eng. Chem. Res.
 PD SEP 15
 PY 2004
 VL 43
 IS 19
 BP 5989
 EP 5995
 PG 7
 SC Engineering, Chemical
 GA 853DT
 UT ISI:000223807400003
 ER
 
 
 PT J
 AU Tanaka, N
    Wever, R
 TI Inhibition of vanadium chloroperoxidase from the fungus Curvularia
    inaequalis by hydroxylamine, hydrazine and azide and inactivation by
    phosphate
 SO JOURNAL OF INORGANIC BIOCHEMISTRY
 LA English
 DT Article
 DE vanadium chloroperoxidase; peroxo intermediate; hydrogen peroxide;
    azide; hydrazine; hydroxylamine; phosphate; inhibition; inactivation
 ID CONTAINING ENZYME CHLOROPEROXIDASE; ACTIVE-SITE MUTANTS;
    ASCOPHYLLUM-NODOSUM; CRYSTAL-STRUCTURE; BROMOPEROXIDASE; VANADATE;
    STATE; BIS(N,N-DIMETHYLHYDROXAMIDO)HYDROXOOXOVANADATE; PEROXIDASES;
    MECHANISM
 AB The first detailed inhibition study of recombinant vanadium
    chloroperoxidase (rVCPO) using hydroxylamine, hydrazine and azide has
    been carried out. Hydroxylamine inhibits rVCPO both competitively and
    uncompetitively. The competitive inhibition constant K-ic and the
    uncompetitive inhibition constant K-iu are 40 and 80 muM, respectively.
    The kinetic data suggest that rVCPO may form a hydroxylamido complex,
    hydroxylamine also seems to react with the peroxovanadate complex
    during turnover. The kinetic data show that the type of inhibition for
    hydrazine and azide is uncompetitive with the uncompetitive inhibition
    constant K-iu of 350 muM and 50 nM, respectively, showing that in
    particular azide is a very potent inhibitor of this enzyme.
    Substitution of vanadate in the active site by phosphate also leads to
    inactivation of vanadium chloroperoxidase. However, the presence of
    H2O2 clearly prevents the inactivation of the enzyme by phosphate. This
    shows that pervanadate is bound much more strongly to the enzyme than
    vanadate. (C) 2004 Elsevier Inc. All rights reserved.
 C1 Univ Amsterdam, Inst Mol Chem, NL-1018 WS Amsterdam, Netherlands.
 RP Wever, R, Univ Amsterdam, Inst Mol Chem, Nieuwe Achtergracht 129,
    NL-1018 WS Amsterdam, Netherlands.
 EM rwever@science.uva.nl
 NR 26
 TC 1
 PU ELSEVIER SCIENCE INC
 PI NEW YORK
 PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
 SN 0162-0134
 J9 J INORG BIOCHEM
 JI J. Inorg. Biochem.
 PD APR
 PY 2004
 VL 98
 IS 4
 BP 625
 EP 631
 PG 7
 SC Biochemistry & Molecular Biology; Chemistry, Inorganic & Nuclear
 GA 811KB
 UT ISI:000220769700009
 ER
 
 
 PT J
 AU Jiang, Y
    Wu, Y
    Xie, B
    Zhang, SY
    Qian, YT
 TI Room temperature preparation of novel Cu2-xSe nanotubes in organic
    solvent
 SO NANOTECHNOLOGY
 LA English
 DT Article
 ID FULLERENE-LIKE STRUCTURES; THIN-FILMS; NANOCRYSTALLINE CU2-XSE; SILICA
    NANOTUBES; VANADIUM-OXIDE; GOLD NANOWIRES; SEMICONDUCTOR;
    NANOPARTICLES; MICROTUBES; CONVENIENT
 AB A compound with a non-layered structure composed of Cu2-xSe nanotubes
    was prepared in a room temperature redox reaction in ethylene diamine
    solution. The product was characterized by x-ray diffractometry,
    transmission electron microscopy, high resolution transmission electron
    microscopy, and x-ray photoelectron spectroscopy. Analysis shows that
    the nanotubes have a multiwall structure with (002) planes of
    face-centred cubic Cu2-xSe and open ends. The Cu2-xSe nanotubes have
    length 500 nm, with an inner diameter of 20 nm and an outer diameter of
    30 nm on average. Ethylene diamine's ability to achieve strong
    coordination and the presence of the reducing agent hydrazine hydrate
    aid the formation of Cu2-xSe nanotubes with mixed valence.
 C1 Hefei Univ Technol, Dept Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China.
    Univ Sci & Technol China, Dept Chem, Anhua 230026, Peoples R China.
    Univ Sci & Technol China, Struct Res Lab, Hefei 230009, Anhui, Peoples R China.
 RP Jiang, Y, Hefei Univ Technol, Dept Mat Sci & Engn, Hefei 230009, Anhui,
    Peoples R China.
 EM apjiang2002@yahoo.com
    ytqian@ustc.edu.cn
 NR 43
 TC 0
 PU IOP PUBLISHING LTD
 PI BRISTOL
 PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
 SN 0957-4484
 J9 NANOTECHNOL
 JI Nanotechnology
 PD MAR
 PY 2004
 VL 15
 IS 3
 BP 283
 EP 286
 PG 4
 SC Engineering, Multidisciplinary; Nanoscience & Nanotechnology; Materials
    Science, Multidisciplinary; Physics, Applied
 GA 807VW
 UT ISI:000220530000012
 ER
 
 
 PT J
 AU Kanna, PS
    Mahendrakumar, CB
    Chatterjee, M
    Hemalatha, P
    Datta, S
    Chakraborty, P
 TI Vanadium inhibits placental glutathione S-transferase (GST-P) positive
    foci in 1,2-dimethyl hydrazine induced rat colon carcinogenesis
 SO JOURNAL OF BIOCHEMICAL AND MOLECULAR TOXICOLOGY
 LA English
 DT Article
 DE vanadium; 1,2-dimethyl hydrazine (1,2-DMH); glutathione S-Transferase
    (GST-P); aberrant crypt foci (ACF); super oxide dismutase (SOD)
 ID ABERRANT CRYPT FOCI; LIVER CARCINOGENESIS; SUPEROXIDE-DISMUTASE;
    CANCER; DIETHYLNITROSAMINE; CHEMOPREVENTION; PROSPECTS; ENZYMES
 AB Vanadium (V) has recently been found to possess potent anti-neoplastic
    Activity in rat colon carcinogenesis. In the present study attempts
    have been made to investigate the expression of the number and area of
    aberrant crypt foci positive for placental glutathione S-transferase
    (GST-P) during 1,2-dimethyl hydrazine (DMH)-induced rat colon
    carcinogenesis. Male Sprague Dawley rats were randomly divided into
    four groups. Rats in group A were designed as normal controls. Group B
    animals received DMH once a week (20 mg/kg body wt.) intraperitoneally
    for 16 weeks. Group C rats received the same treatment of DMH as in
    group B, along with 0.5-ppm vanadium as ammonium monovanadate ad
    libitum in drinking water throughout the experiment. Vanadium alone was
    given to Group D rats without any DMH. injection. The expression of the
    number and the area of aberrant crypt foci (ACF) positive for GST-P was
    maximum in DMH-treated group. Vanadium-treated rats significantly
    reduced (P < 0.001) the expression of GST-P positive ACF cells (by
    71.13%) for the entire period of the study, Moreover the
    histopathological examination also showed that vanadium action could
    minimize the aberrant crypt foci (P < 0.001). Furthermore, vanadium
    supplementation also elevated SOD activities in both liver and colon (P
    < 0.01, P < 0.02 and P < 0.01, P < 0.02 respectively) when compared to
    their carcinogen counterparts. Our results confirm that vanadium is
    particularly effective in limiting the action of the carcinogen,
    thereby establishing its anticarcinogenicity in chemically induced rat
    colon carcinogenesis. (C) 2003 Wiley Periodicals, Inc.
 C1 Jadavpur Univ, Dept Pharmaceut Technol, Div Biochem, Calcutta 700032, W Bengal, India.
 RP Chatterjee, M, Jadavpur Univ, Dept Pharmaceut Technol, Div Biochem,
    Calcutta 700032, W Bengal, India.
 NR 42
 TC 0
 PU JOHN WILEY & SONS INC
 PI HOBOKEN
 PA 111 RIVER ST, HOBOKEN, NJ 07030 USA
 SN 1095-6670
 J9 J BIOCHEM MOL TOXICOL
 JI J. Biochem. Mol. Toxicol.
 PY 2003
 VL 17
 IS 6
 BP 357
 EP 365
 PG 9
 SC Biochemistry & Molecular Biology; Toxicology
 GA 758UJ
 UT ISI:000187668500007
 ER
 
 
 PT J
 AU Hsu, HF
    Chu, WC
    Hung, CH
    Liao, JH
 TI The first example of a seven-coordinate Vanadium(III) thiolate complex
    containing the hydrazine molecule, an intermediate of nitrogen fixation
 SO INORGANIC CHEMISTRY
 LA English
 DT Article
 ID CRYSTAL-STRUCTURE; V(III) COMPLEXES; LIGAND; DISULFIDE; RELEVANT
 AB The first example of a seven-coordinate vanadium(III) thiolate complex,
    [V(PS3")(N2H4)(3)] (1), where PS3" = [P(C6H3-3-Me3Si-2-S)(3)](3-), has
    been synthesized and characterized. Compound 1 contains a tetradentate
    ligand (PS3") and three hydrazine molecules, forming a capped
    octahedral geometry. A five-coordinate vanadium(III) complex,
    [V(PS3)(1-Me-lm)] (2), where PS3 = [P(C6H4-2-S)(3)](3-) and 1-Me-Im =
    1-methyl-imidazole, was also obtained. Compound 2 adopts a trigonal
    bipyramidal geometry, in which the vanadium is ligated by the title
    ligand, PS3, and one 1-Me-lm molecule.
 C1 Natl Cheng Kung Univ, Dept Chem, Tainan 701, Taiwan.
    Natl Changhua Univ Educ, Changhua, Taiwan.
    Natl Chung Cheng Univ, Chiayi 62117, Taiwan.
 RP Hsu, HF, Natl Cheng Kung Univ, Dept Chem, Tainan 701, Taiwan.
 NR 22
 TC 5
 PU AMER CHEMICAL SOC
 PI WASHINGTON
 PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
 SN 0020-1669
 J9 INORG CHEM
 JI Inorg. Chem.
 PD NOV 17
 PY 2003
 VL 42
 IS 23
 BP 7369
 EP 7371
 PG 3
 SC Chemistry, Inorganic & Nuclear
 GA 743FZ
 UT ISI:000186562900011
 ER
 
 
 PT J
 AU Kanna, PS
    Mahendrakumar, CB
    Chakraborty, T
    Hemalatha, P
    Banerjee, P
    Chatterjee, M
 TI Effect of vanadium on colonic aberrant crypt foci induced in rats by
    1,2 Dimethyl hydrazine
 SO WORLD JOURNAL OF GASTROENTEROLOGY
 LA English
 DT Article
 ID PUTATIVE PRENEOPLASTIC LESIONS; S-TRANSFERASE ACTIVITY;
    CELL-PROLIFERATION; DIETARY ANTIOXIDANTS; COLORECTAL-CANCER;
    CARCINOGENESIS; ENZYMES; EXPRESSION; 1,2-DIMETHYLHYDRAZINE; DETOXICATION
 AB AIM: To investigate the chemo preventive effects of vanadium on rat
    colorectal carcinogenesis induced by 1,2-dimethylhydrazine (DMH).
    METHODS: Male Sprague-Dawley Rats were randomly divided into four
    groups. Rats in Group A received saline vehicle alone for 16 weeks.
    Rats in Group B were given DMH injection once a week intraperitoneally
    for 16 weeks; rats in Group C, with the same DMH treatment as in the
    Group 13, but received 0.5-ppm vanadium in the form ammonium
    monovanadate ad libitum in drinking water. Rats in the Group D received
    vanadium alone as in the Group C without DMH injection.
    RESULTS: Aberrant crypt foci (ACF) were formed in animals in
    DMH-treated groups at the end of week 16. Compared to DMH group,
    vanadium treated group had less ACF (P<0.001). At the end of week 32,
    all rats in DMH group developed large intestinal tumors. Rats treated
    with vanadium contained significantly few colonic adenomas and
    carcinomas (P<0.05) compared to rats administered DMH only. In
    addition, a significant reduction (P<0.05) in colon tumor burden (sum
    of tumor sizes per animal) was also evident in animals of Group C when
    compared to those in rats of carcinogen control Group B. The results
    also showed that vanadium significantly lowered PCNA index in ACF
    (P<0.005). Furthermore, vanadium supplementation also elevated liver
    GST and Cyt P-450 activities (P<0.001 and P<0.02, respectively).
    CONCLUSION: Vanadium in the form of ammonium monovanadate supplemented
    in drinking water ad libitum has been found to be highly effective in
    reducing tumor incidence and preneoplastic foci on DMH-induced
    colorectal carcinogenesis. These findings suggest that vanadium
    administration can suppress colon carcinogenesis in rats.
 C1 Jadavpur Univ, Div Biochem, Dept Pharmaceut Technol, Calcutta 700032, W Bengal, India.
 RP Chatterjee, M, Jadavpur Univ, Div Biochem, Dept Pharmaceut Technol, PO
    17028, Calcutta 700032, W Bengal, India.
 NR 52
 TC 5
 PU W J G PRESS
 PI BEIJING
 PA PO BOX 2345, BEIJING 100023, PEOPLES R CHINA
 SN 1007-9327
 J9 WORLD J GASTROENTEROL
 JI World J. Gastroenterol.
 PD MAY
 PY 2003
 VL 9
 IS 5
 BP 1020
 EP 1027
 PG 8
 SC Gastroenterology & Hepatology
 GA 681ML
 UT ISI:000183039900026
 ER
 
 
 PT J
 AU Lisnard, L
    Mialane, P
    Dolbecq, A
    Marrot, J
    Secheresse, F
 TI A tetranuclear oxomolybdenum(V) complex with bridging squarate ligands,
    [(Mo4O8)-O-V(OH)(2)(H2O)(2)(C4O4)(2)](2-)
 SO INORGANIC CHEMISTRY COMMUNICATIONS
 LA English
 DT Article
 DE polyoxometalate; squarate ligands; crystal structure; molybdenum
 ID COORDINATION CHEMISTRY; POLYOXOMOLYBDATES; MOLYBDENUM; VANADIUM
 AB The new tetranuclear polyoxomolybdate(V) ion
    [(Mo4O8)-O-V(OH)(2)(H2O)(2)(C4O4)(2)](2-) has been obtained in one step
    by the reaction of sodium molybdate, hydrazine and squaric acid in
    water and crystallized as a potassium salt. The structure has been
    solved by single-crystal X-ray diffraction showing the location of the
    hydroxo and water molecule ligands. (C) 2003 Elsevier Science B.V. All
    rights reserved.
 C1 Univ Versailles St Quentin, IREM, Ins Lavoisier, UMR C 0173, F-78035 Versailles, France.
 RP Dolbecq, A, Univ Versailles St Quentin, IREM, Ins Lavoisier, UMR C
    0173, 45 Ave Etats Unis, F-78035 Versailles, France.
 NR 16
 TC 6
 PU ELSEVIER SCIENCE BV
 PI AMSTERDAM
 PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
 SN 1387-7003
 J9 INORG CHEM COMMUN
 JI Inorg. Chem. Commun.
 PD MAY
 PY 2003
 VL 6
 IS 5
 BP 503
 EP 505
 PG 3
 SC Chemistry, Inorganic & Nuclear
 GA 661BL
 UT ISI:000181871300018
 ER
 
 
 PT J
 AU Brayner, R
    Bozon-Verduraz, F
 TI Niobium pentoxide prepared by soft chemical routes: morphology,
    structure, defects and quantum size effect
 SO PHYSICAL CHEMISTRY CHEMICAL PHYSICS
 LA English
 DT Article
 ID VANADIUM-OXIDE CATALYSTS; RAMAN-SPECTRA; SURFACE-STRUCTURES;
    SPECTROSCOPY; OXIDATION; CDS; PHOTOCHEMISTRY; HYDROGENATION;
    SUSPENSIONS; REACTIVITY
 AB Niobium pentoxide (Nb2O5) is prepared by soft chemical routes
    (digestion either in ammonia or in hydrazine solutions) and is compared
    to a commercial sample. According to various characterization methods
    (XRD, HRTEM, DTA-TG, UV-visible diffuse reflectance, Raman and EPR
    spectroscopies), Nb2O5 shows particular bulk and surface properties.
    The phase transformation temperatures (amorphous --> pseudo-hexagonal,
    pseudo-hexagonal --> orthorhombic and orthorhombic --> monoclinic) for
    the synthetic Nb2O5 are about 100-150degreesC higher than for the
    commercial sample. The textural properties depend strongly on the
    preparation method. After calcination at 400degreesC, the sample
    prepared in ammonia has a larger pore volume (0.22 cm(3) g(-1)) and a
    better resistance to sintering at 600degreesC. The preparation in
    hydrazine gives the following advantages only if the gel is sonically
    redispersed in ethanol: low particle size, narrow size distribution,
    and higher resistance to sintering (140 m(2) g(-1) at 600degreesC).
    Preparation in ammonia or in hydrazine favors the formation of defects,
    characterized by a significant absorption in the visible range adjacent
    to the interband transition (3.4 eV, 360 nm). These defects, which
    disappear upon heating in oxygen, are identified as Nb4+ species and
    ionized oxygen vacancies as confirmed by EPR measurements. Finally, the
    nanoparticles obtained by sonication in ethanol (average particle size
    4.5 nm) shows a significant band gap increase ( from 3.4 eV to 4.2 eV)
    which is assigned to a quantum size effect.
 C1 Univ Paris 07, CNRS, Lab Chim Mat Divises & Catalyse, ITODYS,UMR 7086, F-75251 Paris 05, France.
 RP Bozon-Verduraz, F, Univ Paris 07, CNRS, Lab Chim Mat Divises &
    Catalyse, ITODYS,UMR 7086, Case 7090,Pl Jussieu, F-75251 Paris 05,
    France.
 NR 56
 TC 2
 PU ROYAL SOC CHEMISTRY
 PI CAMBRIDGE
 PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
    ENGLAND
 SN 1463-9076
 J9 PHYS CHEM CHEM PHYS
 JI Phys. Chem. Chem. Phys.
 PY 2003
 VL 5
 IS 7
 BP 1457
 EP 1466
 PG 10
 SC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
 GA 654YE
 UT ISI:000181523900018
 ER
 
 
 PT J
 AU Jiang, Y
    Xie, B
    Wu, J
    Yuan, SW
    Wu, Y
    Huang, H
    Qian, YT
 TI Room-temperature synthesis of copper and silver, nanocrystalline
    chalcogenides in mixed solvents
 SO JOURNAL OF SOLID STATE CHEMISTRY
 LA English
 DT Article
 ID FULLERENE-LIKE STRUCTURES; VANADIUM-OXIDE; METAL; MAGNETORESISTANCE;
    CONVENIENT; SELENIDES; NANOTUBES; FILMS; SE
 AB Copper and silver nanocrystalline chalcogenides, Cu2-xSe, Cu2Te, Ag2Se,
    and Ag2Te, have been successfully synthesized in a mixture of
    ethylenediamine and hydrazine hydrate as a solvent at room temperature.
    Products showed different morphologies, such as nanotubes, nanorods,
    and nanoparticles. The results indicated that the coordination and
    chelation abilities of ethylenediamine play an important role in the
    formation of one-dimensional nanocrystalline binary chalcogenides, and
    hydrazine hydrate is crucial to the electron transfer in the room
    temperature reactions. These transition-metal nanocrystalline
    chalcogenides as prepared were analyzed by X-ray powder diffraction,
    transmission electron microscopy, and X-ray photoelectron spectroscopy.
    The UV-Vis absorption properties of these nanocrystals were also
    measured. (C) 2002 Elsevier Science (USA).
 C1 Univ Sci & Technol China, Struct Res Lab, Hefei 230026, Anhui, Peoples R China.
    Univ Sci & Technol China, Dept Chem, Hefei 230026, Anhui, Peoples R China.
    Hefei Univ Technol, Inst Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China.
 RP Qian, YT, Univ Sci & Technol China, Struct Res Lab, Hefei 230026,
    Anhui, Peoples R China.
 NR 30
 TC 9
 PU ACADEMIC PRESS INC ELSEVIER SCIENCE
 PI SAN DIEGO
 PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
 SN 0022-4596
 J9 J SOLID STATE CHEM
 JI J. Solid State Chem.
 PD AUG
 PY 2002
 VL 167
 IS 1
 BP 28
 EP 33
 PG 6
 SC Chemistry, Inorganic & Nuclear; Chemistry, Physical
 GA 592BA
 UT ISI:000177915800004
 ER
 
 
 PT J
 AU Davies, SC
    Hughes, DL
    Konkol, M
    Richards, RL
    Sanders, JR
    Sobota, P
 TI Synthesis, structure and chemistry of vanadium(IV) and vanadium(V)
    compounds with substituted hydrazido(1-) and hydrazido(2-) ligands
 SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
 LA English
 DT Article
 ID CRYSTAL-STRUCTURES; CO-LIGANDS; DINITROGEN COMPLEXES; TUNGSTEN;
    N(CH2CH2S)(3)(3-); MOLYBDENUM; HYDRAZINE; OXIDE
 AB The reaction of [V(NS3)O] [NS3 = N(CH2CH2S)(3\)] with methylhydrazine
    gives the hydrazido(1-) vanadium() complex [V(NS3)(NMeNH2)] 1, but
    reaction with various other compounds containing N-N groups results in
    formation of compounds containing substituted hydrazido(2-) ligands.
    Structures of 1, [V(NS3)(NNC5H10)] 2 and [V(NS3)(NNCPh2)] 3 are
    described.
 C1 John Innes Ctr Plant Sci Res, Dept Biol Chem, Norwich NR4 7UH, Norfolk, England.
    Univ Wroclaw, Fac Chem, PL-50138 Wroclaw, Poland.
    Univ Sussex, Sch Chem Phys & Environm Sci, Brighton BN1 9QJ, E Sussex, England.
 RP Davies, SC, John Innes Ctr Plant Sci Res, Dept Biol Chem, Norwich NR4
    7UH, Norfolk, England.
 NR 17
 TC 1
 PU ROYAL SOC CHEMISTRY
 PI CAMBRIDGE
 PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
    ENGLAND
 SN 1472-7773
 J9 J CHEM SOC DALTON TRANS
 JI J. Chem. Soc.-Dalton Trans.
 PY 2002
 IS 14
 BP 2811
 EP 2814
 PG 4
 SC Chemistry, Inorganic & Nuclear
 GA 573GY
 UT ISI:000176822000008
 ER
 
 
 PT J
 AU Zhang, HT
    Gui, Z
    Fan, R
    Chen, XH
 TI Hydrothermal synthesis and characterization of nanorods "LixV2-delta
    O4-delta center dot H2O"
 SO INORGANIC CHEMISTRY COMMUNICATIONS
 LA English
 DT Article
 DE hydrothermal synthesis; LixV2-delta O4-delta center dot H2O; nanorods;
    vanadium oxide
 ID RECHARGEABLE LITHIUM BATTERIES; CATHODE
 AB Nanorods "LixV2-deltaO4-delta . H2O" were hydrothermally synthesized
    with starting agents LiOH . H2O and V2O5, and reducing agent hydrazine
    monohydrate (NH2NH2 . H2O) under alkaline condition at 160 degreesC.
    The samples were characterizated by X-ray diffraction (XRD),
    transmission electron microscopy (TEM) and X-ray photoelectron
    spectroscopy (XPS). The nanorods obtained have diameters from 80 to 100
    nm with length up to several micrometers. Molecular coordination and
    assembly mechanism can be assumed to explain the formation of
    one-dimensional nanorods. (C) 2002 Elsevier Science B.V. All rights
    reserved.
 C1 Univ Sci & Technol China, Dept Phys, Struct Res Lab, Anhua 230026, Peoples R China.
    Univ Sci & Technol China, State Key Lab Fire Sci, Anhua 230026, Peoples R China.
 RP Chen, XH, Univ Sci & Technol China, Dept Phys, Struct Res Lab, Anhua
    230026, Peoples R China.
 NR 27
 TC 0
 PU ELSEVIER SCIENCE BV
 PI AMSTERDAM
 PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
 SN 1387-7003
 J9 INORG CHEM COMMUN
 JI Inorg. Chem. Commun.
 PD JUN
 PY 2002
 VL 5
 IS 6
 BP 399
 EP 402
 PG 4
 SC Chemistry, Inorganic & Nuclear
 GA 564FV
 UT ISI:000176305100007
 ER
 
 
 PT J
 AU Xu, W
    Xue, CH
 TI Catalytic performance of fluidized-bed catalyst for oxidation of
    n-butane to maleic anhydride
 SO CHINESE JOURNAL OF CATALYSIS
 LA English
 DT Article
 DE n -butane; maleic anhydride; selective oxidation; fluidized-bed
    catalyst; hydrazine hydrate; vanadium pentoxide
 ID PHOSPHORUS OXIDE CATALYSTS; VANADYL PYROPHOSPHATE; SELECTIVE OXIDATION;
    VPO CATALYSTS; ACTIVE PHASE; MECHANISM
 AB The experiments of precursor preparation have been performed to
    investigate the effects of N2H4 . H2O/V2O5 mole ratio on catalytic
    performance of VPO catalyst for oxidation of n -butane to maleic
    anhydride (MA). For the catalyst samples prepared at higher mole ratio
    of N2H4 . H2O/V2O5, the quantity of (VO)(2)P2O7 (V4+) phase is
    considerably large, and the n -butane conversion is quite high. With
    the decrease of N2H4 . H2O/ V2O5 mole ratio in precursor preparation,
    the relative amount of delta-VOPO4,(V5+) phase increases progressively.
    The increase of V5+ phase strengthens the oxidation of the intermediate
    olefins, and then promotes the dehydrogenation of n -butane. Thus, the
    selectivity for MA increases at beginning, whereas the n -butane
    conversion increases continuously. When the V5+ phase reaches a given
    quantity, the overoxidation takes place, and the selectivity for MA
    begins to decrease. The yield of MA goes through a Maximum value at the
    optimal N2H4 . H2O/ V2.O5 mole ratio during the change of N2H4 .
    H2O/V2O5 mole ratio in precursor preparation from high to low. The
    catalyst sample prepared at N2H4 . H2O/V2O5 Mole ratio of 0.34 gave the
    maximum MA yield of 49.74% under the conditions of n -butane
    concentration of 4.0%, space velocity of 500 h(-1) and temperature of
    420degreesC. The catalyst of fine particle bed in this study belongs to
    the particles of group A. The catalyst fluidizes easily and behaves a
    larger flexibility for operation.
 C1 Tianjin Univ, Sch Chem Engn, Tianjin 300072, Peoples R China.
 RP Xu, W, Tianjin Univ, Sch Chem Engn, Tianjin 300072, Peoples R China.
 NR 16
 TC 0
 PU SCIENCE CHINA PRESS
 PI BEIJING
 PA 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
 SN 0253-9837
 J9 CHIN J CATAL
 JI Chin. J. Catal.
 PD MAY
 PY 2002
 VL 23
 IS 3
 BP 199
 EP 202
 PG 4
 SC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical
 GA 563CH
 UT ISI:000176236500003
 ER
 
 
 PT J
 AU Mohamed, AA
    Ahmed, SA
    El-Shahat, MF
 TI Catalytic spectrophotometric determination of molybdenum
 SO MONATSHEFTE FUR CHEMIE
 LA English
 DT Article
 DE molybdenum; catalytic determination; 2-aminophenol; hydrogen peroxide;
    redox reaction; natural and waste waters
 ID STRIPPING VOLTAMMETRIC DETERMINATION; ATOMIC-ABSORPTION SPECTROMETRY;
    HYDROGEN-PEROXIDE; HYDRAZINE DIHYDROCHLORIDE; TRACE AMOUNTS; TUNGSTEN;
    CHROMIUM; OXIDATION; VANADIUM; CHLORIDE
 AB A highly selective, sensitive, and simple catalytic method for the
    determination of molybdenum in natural and waste waters was developed.
    It is based on the catalytic effect of Mo(VI) on the oxidation of
    2-aminophenol with H2O2. The reaction is monitored
    spectrophotometrically,by tracing the oxidation product at 430 nm after
    10 min of mixing the reagents. Addition of 800 mug . cm(-3) EDTA
    conferred high selectivity; however, interfering effects of Au(III),
    Cr(III), Cr(VI), and Fe(III) had to be eliminated by a reduction and
    co-precipitation procedure with SnCl2 and Al(OH)(3). Mo(VI) shows a
    linear calibration graph up to 11.0 ng . cm(-3); the detection limit,
    based on the 3S(b)-criterion, is 0.10 ng . cm(-3). The unique
    selectivity and sensitivity of the new method allowed its direct
    application to the determination of Mo(VI) in natural and waste waters.
 C1 Ain Shams Univ, Fac Sci, Dept Chem, Cairo 11566, Egypt.
 RP Mohamed, AA, King Khalid Univ, Fac Sci, Dept Chem, Abha 9033, Saudi
    Arabia.
 NR 52
 TC 0
 PU SPRINGER-VERLAG WIEN
 PI VIENNA
 PA SACHSENPLATZ 4-6, PO BOX 89, A-1201 VIENNA, AUSTRIA
 SN 0026-9247
 J9 MONATSH CHEM
 JI Mon. Chem.
 PD JAN
 PY 2002
 VL 133
 IS 1
 BP 31
 EP 40
 PG 10
 SC Chemistry, Multidisciplinary
 GA 514VJ
 UT ISI:000173461500004
 ER
 
 
 PT J
 AU Ramababu, G
    Rao, PVS
    Ramakrishna, K
    Syamala, P
    Satyanarayana, A
 TI Oxidation of hydrazine and hydroxylamine by vanadium(V) under the
    conditions where VO2+ and decavanadates coexist
 SO JOURNAL OF THE INDIAN CHEMICAL SOCIETY
 LA English
 DT Article
 ID SULFURIC-ACID MEDIUM
 AB The kinetics of oxidation of hydrazine and hydroxylamine have been
    investigated in the pH range 3.1-4.3. Both the oxidations obey first
    order kinetics with respect to the reductant, but the rate has very
    little dependence on [V-V](t). The reactions are accelerated by H+ ion
    but the dependence of rate on [H+] is less than that corresponding to
    first order dependence. Under these conditions, the species, VO2+ is in
    equilibrium with decavanadate ions and the equilibrium accounts for the
    different kinetic pattern observed in this pH range.
 C1 Andhra Univ, Sch Chem, Visakhapatnam 530003, Andhra Pradesh, India.
 RP Rao, PVS, Andhra Univ, Sch Chem, Visakhapatnam 530003, Andhra Pradesh,
    India.
 NR 19
 TC 4
 PU INDIAN CHEMICAL SOC
 PI CALCUTTA
 PA 92 ACHARYA PRAFULLA CHANDRA RD ATTN:DR INDRAJIT KAR/EXEC SEC, CALCUTTA
    700009, INDIA
 SN 0019-4522
 J9 J INDIAN CHEM SOC
 JI J. Indian Chem. Soc.
 PD MAY
 PY 2001
 VL 78
 IS 5
 BP 237
 EP 240
 PG 4
 SC Chemistry, Multidisciplinary
 GA 441WB
 UT ISI:000169251600005
 ER
 
 
 PT J
 AU Pal, S
    Pal, S
 TI A dimeric pervanadyl (VO2+) complex with a tridentate Schiff base ligand
 SO JOURNAL OF CHEMICAL CRYSTALLOGRAPHY
 LA English
 DT Article
 DE pervanadyl complex; Schiff base; di(mu-oxo)-bridged dimer; crystal
    structure
 ID CRYSTAL-STRUCTURE; VANADIUM(V); CHEMISTRY
 AB A di(mu -oxo)-bridged dinuclear complex, [VO2(pamh)](2) was isolated by
    reacting bis(acetylacetonato)vanadium(IV) and the Schiff base,
    N-(anisoyl)-N'-(picolinylidene)-hydrazine (Hpamh) in acetonitrile. The
    complex crystallizes in the space group P (1) over bar (#2) on
    crystallographic inversion center. Crystal data: a = 8.2202(12)
    Angstrom, b = 9.8389(19) Angstrom ,c = 10.1907(17) Angstrom, alpha =
    68.245(15)degrees, beta = 74.47(2)degrees, gamma = 66.710(19)degrees, V
    = 696.0(2) Angstrom (3), and Z = 1. The physical properties of the
    complex and the structural parameters are consistent with the +5
    oxidation state of the metal ions. The monomeric VO2(pamh) unit is
    square-pyramidal. The planar mononegative ligand (pamh(-)) coordinates
    the metal ion via the pyridine-N, the imine-N, and the amide-O atoms.
    One of the oxo groups completes the NNOO basal plane and also
    participates in the V-O-V bridge formation. The other oxo group
    satisfies the fifth apical coordination site. The molecular structure
    of the dimeric complex, [VO2(pamh)](2) can be described as two
    edge-shared distorted VO4N2 octahedra.
 C1 Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh, India.
 RP Pal, S, Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh,
    India.
 NR 22
 TC 6
 PU KLUWER ACADEMIC/PLENUM PUBL
 PI NEW YORK
 PA 233 SPRING ST, NEW YORK, NY 10013 USA
 SN 1074-1542
 J9 J CHEM CRYSTALLOGRAPHY
 JI J. Chem. Crystallogr.
 PD MAY
 PY 2000
 VL 30
 IS 5
 BP 329
 EP 333
 PG 5
 SC Crystallography; Spectroscopy
 GA 431CJ
 UT ISI:000168614100006
 ER
 
 
 PT J
 AU Davies, SC
    Hughes, DL
    Janas, Z
    Jerzykiewicz, LB
    Richards, RL
    Sanders, JR
    Silverston, JE
    Sobota, P
 TI Vanadium complexes of the N(CH2CH2S)(3)(3-) and O(CH2CH2S)(2)(2-)
    ligands with coligands relevant to nitrogen fixation processes
 SO INORGANIC CHEMISTRY
 LA English
 DT Article
 ID RAY CRYSTAL-STRUCTURES; MOLECULAR-STRUCTURE; DINITROGEN FIXATION;
    MOLYBDENUM; HYDRAZINE; CHEMISTRY; REDUCTION; IMIDO; TUNGSTEN; AMMONIA
 AB Vanadium(III) and vanadium(V) complexes derived from the
    tris(2-thiolatoethyl)amine ligand [(NS3)(3-)] and the
    bis(2-thiolatoethyl)ether ligand [(OS2)(2-)] have been synthesized with
    the aim of investigating the potential of these vanadium sites to bind
    dinitrogen and activate its reduction. Evidence is presented for the
    transient existence of {V(NS3)(N-2)V(NS3)}, and a series of mononuclear
    complexes containing hydrazine, hydrazide, imide, ammine, organic
    cyanide, and isocyanide ligands has been prepared and the chemistry of
    these complexes investigated. [V(NS3)O] (1) reacts with an excess of
    N2H4 to give, probably via the intermediates {V(NS3)(NNH2)} (2a) and
    {V(NS3)(N-2)V(NS3)} (3), the V-III adduct [{V(NS3)(N2H4)}] (4). If 1 is
    treated with 0.5 mol of N2H4, 0.5 mol of N-2 is evolved and green,
    insoluble [{V(NS3)}(n)] (5) results. Compound 4 is converted by
    disproportionation to [V(NS3)-(NH3)- (NH3)](6), but 4 does not act as a
    catalyst for disproportionation of N2H4 nor does it act as a catalyst
    for its reduction by Zn/HOC6H3Pr2i-2,6. Compound 1 reacts with
    (NR2NR22)-N-1 (R-1 = H or SiMe3; R-2(2) = Me-2, MePh, or HPh) to give
    the hydrazide complexes [V(NS3)(NNR22)] (R-2(2) = Me-2, 2b; R-2(2) =
    MePh, 2c; R-2(2) HPh, 2d), which are not protonated by anhydrous HBr
    nor are they reduced by Zn/HOC6H3Pri2-2,6. Compound 2b can also be
    prepared by reaction of [V(NNMe2)(dipp)(3)] (dipp = OC6H3Pr2i-2,6) with
    NS3H3. N2H4 is displaced quantitatively from 4 by anions to give the
    salts [NR43][V(NS3)X] (X = Cl, R-3 = Et, 7a; X = Cl. R-3 = Ph, 7b; X =
    Br, R-3 = Et, 7c; X = N-3, R-3 = Bu-n, 7d; X = N-3, R-3 = Et, 7e; X =
    CN, R-3 = Et, 7f). Compound 6 loses NH3 thermally to give 5, which can
    also be prepared from [VCl3(THF)(3)] and NS3H3/LiBun. Displacement of
    NH3 from 6 by ligands L gives the adducts [V(NS3)(L)] (L = MeCN, nu(CN)
    2264 cm(-1), 8a; L = (BuNC)-N-t, nu(NC) 2173 cm(-1), 8b; L = C6H11NC.
    nu(NC) 2173 cm(-1), 8c). Reaction of 4 with N3SiMe3 gives
    [V(NS3)(NSiMe3)] (9), which is converted to [V(NS3)(NH)] (10) by
    hydrolysis and to [V(NS3)(NCPh3)] (11) by reaction with ClCPh3.
    Compound 10 is converted into 1 by [NMe4]OH and to [V(NS3)NLi(THF)(2)]
    (12) by LiNPri in THF.
    A further range of imido complexes [V(NS3)(NR4)] (R-4 = C6H4Y-4, where
    Y = H (13a), OMe (13b), Me (13c), Cl (13d), Br (13e), NO2 (13f); R-4 =
    C6H4Y-3, where Y = OMe (13g); Cl (13h); R-4 = C6H3Y2-3,4, where Y = Me
    (13i); C1(13j); R-4 = C6H11 (13k)) has been prepared by reaction of 1
    with (RNCO)-N-4. The precursor complex [V(OS2)O(dipp)] (14) [OS22- =
    O(CH2CH2S)(2)(2-)] has been prepared from [VO(OPri)(3)], Hdipp, and
    OS2H2 It reacts with NH2NMe2 to give [V(OS2)(NH2Me2)(dipp)] (15) and
    with NsSiMe(3) to give [V(OS2)(NSiMe3)(dipp)] (16). A second oxide
    precursor, formulated as [V(OS2)(1.5)O] (17), has also been obtained,
    and it reacts with SiMe3NHNMe2 to give [V(OS2)(NNMe2)(OSiMe3)] (18).
    The X-ray crystal structures of the complexes 2b, 2c, 4, 6, 7a, 8a, 9,
    ill, 13d, 14, 15, 16, and 18 have been determined, and the V-51 NMR and
    other spectroscopic parameters of the complexes are discussed in terms
    of electronic effects.
 C1 John Innes Ctr Plant Sci Res, Nitrogen Fixat Lab, Norwich NR4 7UH, Norfolk, England.
    Univ Wroclaw, Fac Chem, PL-50383 Wroclaw, Poland.
 RP Sanders, JR, John Innes Ctr Plant Sci Res, Nitrogen Fixat Lab, Colney
    Lane, Norwich NR4 7UH, Norfolk, England.
 NR 49
 TC 17
 PU AMER CHEMICAL SOC
 PI WASHINGTON
 PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
 SN 0020-1669
 J9 INORG CHEM
 JI Inorg. Chem.
 PD AUG 7
 PY 2000
 VL 39
 IS 16
 BP 3485
 EP 3498
 PG 14
 SC Chemistry, Inorganic & Nuclear
 GA 343TN
 UT ISI:000088717900011
 ER
 
 
 PT J
 AU Safavi, A
    Sedghy, HR
    Shams, E
 TI Kinetic spectrophotometric determination of trace amounts of selenium
    and vanadium
 SO FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY
 LA English
 DT Article
 ID ANALYTICAL-CHEMISTRY; REDUCTION; SULFIDE
 AB A sensitive kinetic spectrophotometric method has been developed for
    the determination of Se(IV) over the range of 45 to 4000 ng in 10 mt of
    solution. The method is based on the catalytic effect of Se(TV)on the
    reduction reaction of bromate by hydrazinium dichloride, with
    subsequent reaction of Ponceau S with products of the above reaction
    (chlorine and bromine),causing color changing of Ponceau S. Method
    development includes optimization of time interval for measurement of
    slope, pH, reagents concentration, and temperature. The optimized
    conditions yielded a theoretical detection limit of 33 ng/10 mt of
    solution of Se(IV). The interfering effects were studied and removed.
    The method was applied to the determination of selenium in spiked
    water, Kjeldahl tablet, selenium tablet, and shampoo. Vanadium(V) has
    an inhibition effect on the catalyzed reaction of bromate and hydrazine
    by selenium. Using this effect, V(V) can be determined in the range of
    70 to 2500 ng in 10 mt of solution. The optimization procedure includes
    pH and selenium concentration. An extraction method was used for
    interference removal. The method was applied to the determination of
    vanadium in petroleum.
 C1 Shiraz Univ, Fac Sci, Dept Chem, Shiraz, Iran.
 RP Safavi, A, Shiraz Univ, Fac Sci, Dept Chem, Shiraz, Iran.
 NR 30
 TC 2
 PU SPRINGER VERLAG
 PI NEW YORK
 PA 175 FIFTH AVE, NEW YORK, NY 10010 USA
 SN 0937-0633
 J9 FRESENIUS J ANAL CHEM
 JI Fresenius J. Anal. Chem.
 PD NOV
 PY 1999
 VL 365
 IS 6
 BP 504
 EP 510
 PG 7
 SC Chemistry, Analytical
 GA 259KL
 UT ISI:000083893000006
 ER
 
 
 PT J
 AU Sangeetha, NR
    Pal, S
 TI Syntheses and structures of square-pyramidal acetonitrile coordinated
    copper(II) complexes with N-(aroyl)-N '(5-nitrosalicylidene)hydrazines
 SO JOURNAL OF CHEMICAL CRYSTALLOGRAPHY
 LA English
 DT Article
 DE X-ray structure; pentacoordinated copper(II); square-pyramid;
    acetonitrile coordination
 ID SCHIFF-BASE COMPLEXES; CRYSTAL-STRUCTURE; TRANSITION-METALS; AROYL
    HYDRAZONES; LIGANDS; VANADIUM(V); CHEMISTRY
 AB The syntheses and structures of two square-pyramidal acetonitrile
    coordinated copper(II) complexes, [Cu(HbhsNO(2))(CH3CN)(2)]ClO4 (1) and
    [Cu(HahsNO(2)) (CH3CN)(ClO4)] (2), are described. The mononegative
    ligands are obtained by deprotonation of the phenolic-OH of
    N-(benzoyl)-N'-(5-nitrosalicylidene)hydrazine (H(2)bhsNO(2)) and of
    N-(anisoyl)-N'-(5-nitrosalicylidene)hydrazine (H(2)ahsNO(2)). Crystal
    data for 1: monoclinic, P2(1)/c (#14), a = 9.7245(14), b = 20.23(4), c
    = 11.042(3) Angstrom, beta = 91.86(2)degrees, V = 2171.0(7)
    Angstrom(3), and Z = 4 and for 2: triclinic, P (1) over bar (#2), a =
    9.7710(19), b = 9.9687(15), c = 11.062(5) Angstrom, alpha = 73.10(3),
    beta = 88.77(3), gamma = 88.379(14)degrees, V = 1030.4(5) Angstrom(3),
    and Z = 2. In each complex the planar ligand binds the metal ion via
    phenolate-O, imine-N, and amide-O. The nitrogen of an acetonitrile
    molecule satisfies the fourth site of the square-plane containing the
    metal ion. In 1 the axial coordination is provided by the nitrogen of a
    second acetonitrile molecule, whereas in 2 one of the oxygen atoms of
    the perchlorate occupies the fifth axial site. The axial acetonitrile
    molecule of 1 is bound to the metal center in a bent mode. The other
    noticeable difference between the two structures is in the geometry at
    the metal center. A large displacement (0.23 Angstrom) of the metal ion
    from the ONON basal plane towards the axial coordinating atom is
    observed in 1. On the other hand, there is no displacement of the metal
    center from the same ONON basal plane in 2. The EPR and electronic
    spectral features in acetonitrile solutions are consistent with the
    solid state structures.
 C1 Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh, India.
 RP Pal, S, Univ Hyderabad, Sch Chem, Hyderabad 500046, Andhra Pradesh,
    India.
 NR 44
 TC 6
 PU KLUWER ACADEMIC/PLENUM PUBL
 PI NEW YORK
 PA 233 SPRING ST, NEW YORK, NY 10013 USA
 SN 1074-1542
 J9 J CHEM CRYSTALLOGRAPHY
 JI J. Chem. Crystallogr.
 PD MAR
 PY 1999
 VL 29
 IS 3
 BP 287
 EP 293
 PG 7
 SC Crystallography; Spectroscopy
 GA 225ND
 UT ISI:000081966900005
 ER
 
 
 PT J
 AU Goodall, P
 TI Determination of total and extractable hydrogen peroxide in organic and
    aqueous solutions of uranyl nitrate
 SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
 LA English
 DT Article
 ID FLOW-INJECTION ANALYSIS
 AB The development of a spectrophotometric method for the determination of
    hydrogen peroxide in uranyl nitrate solutions is reported. The method
    involves the measurement of the absorbance at 520 nm of a vanadyl
    peroxide species. This species was formed by the addition of a reagent
    consisting of vanadium (V) (50 mmol.dm(-3)) in dilute sulphuric acid (2
    mol.dm(-3) H2SO4) This reagent, after dilution, was also used as an
    extractant for organic phase samples. The method is simple and robust
    and tolerant of nitric acid and U(VI). Specificity and accuracy were
    improved by the application of solid phase extraction techniques to
    remove entrained organic solvents and Pu(IV). Reverse phase solid phase
    extraction was used to clean-up aqueous samples or extracts which were
    contaminated with entrained solvent. A solid phase extraction system
    based upon an extraction chromatography system was used to remove
    Pu(IV). Detection limits of 26 mu mol.dm(-3) (0.88 mu g.cm(-3)) or 7 mu
    mol.dm(-3) (0.24 mu g.cm(-3)) for, respectively, a 1 and 4 cm path
    length cell were obtained. Precisions of RSD = 1.4% and 19.5% were
    obtained at the extremes of the calibration curve (5 mmol.dm(-3) and 50
    mu mol.dm(-3) H2O2, 1 cm cell). The introduction of the extraction and
    clean-up stages had a negligible effect upon the precision of the
    determination. The stability of an organic phase sample was tested and
    no loss of analyte could be discerned over a period of at least 5 days.
    The presence of trace levels of reductants interfered with the
    determination, e.g., hydrazine (<2 mmol.dm(-3)), but this effect was
    ameliorated by increasing the concentration of the colormetric reagent.
 C1 BNFL, Seascale CA20 1PG, Cumbria, England.
 RP Goodall, P, BNFL, Bldg 229 Sellafield, Seascale CA20 1PG, Cumbria,
    England.
 NR 7
 TC 0
 PU ELSEVIER SCIENCE SA
 PI LAUSANNE
 PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
 SN 0236-5731
 J9 J RADIOANAL NUCL CHEM
 JI J. Radioanal. Nucl. Chem.
 PD APR
 PY 1999
 VL 240
 IS 1
 BP 5
 EP 13
 PG 9
 SC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science
    & Technology
 GA 191NB
 UT ISI:000080027500002
 ER
 
 
 PT J
 AU Fahmi, N
    Singh, RV
 TI Synthetic, structural and biological studies of oxovanadium(V)
    complexes of azomethines
 SO INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL
    THEORETICAL & ANALYTICAL CHEMISTRY
 LA English
 DT Article
 ID BENZOTHIAZOLINES; MANGANESE(II); VANADIUM; VANADATE
 AB A few metal complexes of oxovanadium(V) with
    2-(2-fluorophenyl-methylene) hydrazine carbothioamide or -carboxamide
    and 2-[1-(2-fluorophenyl)ethylidene] hydrazine carbothioamide or
    -carboxamide have been synthesized and characterized by elemental
    analysis, molecular weight determinations, molar conductance, magnetic
    measurements, IR, H-1 NMR and F-19 NMR studies. The IR and NMR spectral
    data suggest the involvement of sulphur/oxygen and azomethine nitrogen
    in coordination to the central metal ion. The free ligands and their
    metal complexes have been tested in vitro against a number of
    microorganisms to assess their antimicrobial properties.
 C1 Univ Rajasthan, Dept Chem, Jaipur 302004, Rajasthan, India.
 RP Singh, RV, Univ Rajasthan, Dept Chem, Jaipur 302004, Rajasthan, India.
 NR 16
 TC 6
 PU NATL INST SCIENCE COMMUNICATION
 PI NEW DELHI
 PA DR K S KRISHNAN MARG, NEW DELHI 110 012, INDIA
 SN 0376-4710
 J9 INDIAN J CHEM SECT A
 JI Indian J. Chem. Sect A-Inorg. Bio-Inorg. Phys. Theor. Anal. Chem.
 PD DEC
 PY 1998
 VL 37
 IS 12
 BP 1126
 EP 1129
 PG 4
 SC Chemistry, Multidisciplinary
 GA 177VR
 UT ISI:000079232200019
 ER
 
 
 PT J
 AU Davies, SC
    Durrant, MC
    Hughes, DL
    Le Floc'h, C
    Pope, SJA
    Reid, G
    Richards, RL
    Sanders, JR
 TI Synthesis, spectroscopic and EXAFS studies of vanadium complexes of
    trithioether ligands and crystal structures of [VCl3([9]aneS(3))] and
    [VI2(thf)([9]aneS(3))] ([9]aneS(3) = 1,4,7-trithiacyclononane)
 SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
 LA English
 DT Article
 ID THIOETHER; NITROGENASES; COORDINATION; REACTIVITY; CONVERSION;
    HYDRAZINE; CHEMISTRY; AMMONIA
 AB A series of vanadium-(II), -(III) and -(Iv) macrocyclic thioether
    complexes has been synthesized and characterised by analytical,
    magnetic and spectroscopic methods. The new complexes reported are
    [{V([9]aneS(3))}(2)(mu-Cl)(3)]Cl ([9]aneS(3) =
    1,4,7-trithiacyclononane), [VI2(thf)([9]aneS(3))], [VI2(ttob)] (ttob =
    2,5,8-trithia[9]-o-benzenophane), [VX3([9]aneS(3))] (X = Cl, Br or I),
    [VX3([10]aneS(3))] ([10]aneS(3) = 1,4,7-trithiacyclodecane),
    [VCl3(ttob)], [VCl3([16]aneS(4))] ([16]aneS(4) =
    1,5,9,13-tetrathiacyclohexadecane), [(VX3)(2)(mu-[18]aneS(6))] (X = Cl
    or Br [18]aneS(6) = 1,4,7,10,13,16-hexathiacyclooctadecane) and
    [VOCl2(ttob)]. The crystal structures of [VI2(thf)([9]aneS(3))] and
    [VCl3([9]aneS(3))] and EXAFS structural data for [VX3([9]aneS(3))] and
    [VX3([10]aneS(3))] are presented and discussed. The acyclic
    trithioether complexes [VX3{MeC(CH2SMe)(3)}] (X = Cl or Br) and the
    complex [VI2(py)(4)] are also reported.
 C1 Univ Southampton, Dept Chem, Southampton SO17 1BJ, Hants, England.
    John Innes Ctr Plant Sci Res, Nitrogen Fixat Lab, Norwich NR4 7UH, Norfolk, England.
 RP Reid, G, Univ Southampton, Dept Chem, Southampton SO17 1BJ, Hants,
    England.
 NR 45
 TC 7
 PU ROYAL SOC CHEMISTRY
 PI CAMBRIDGE
 PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE CB4 4WF,
    CAMBS, ENGLAND
 SN 0300-9246
 J9 J CHEM SOC DALTON TRANS
 JI J. Chem. Soc.-Dalton Trans.
 PD JUL 7
 PY 1998
 IS 13
 BP 2191
 EP 2198
 PG 8
 SC Chemistry, Inorganic & Nuclear
 GA 102KW
 UT ISI:000074924300013
 ER
 
 
 PT J
 AU Sun, CQ
    Liu, GJ
    Zhang, HA
 TI Fabrication of a self-assembling film electrode containing
    vanadium-oxygen phthalocyanine and its electrocatalytic oxidation for
    hydrazine
 SO CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
 LA Chinese
 DT Article
 DE molecular deposition technique; self-assembling film; vanadium-oxygen
    phthalocyanine; hytrazine
 ID MOLECULAR ASSEMBLIES; GOLD; MONOLAYERS; SURFACES
 AB A monolayer containing vanadium-oxygen phthalocyanine on the surface of
    2-dimethylaminoethanethiol-modified gold electrode was achieved based
    on electrostatic interaction. The electrode exhibits a high catalytic
    activity toward the electrooxidation of hydrazine. The method is very
    useful in other fabrication of functional molecules.
 C1 Jilin Univ, Dept Chem, Changchun 130023, Peoples R China.
    China Inst Metrol, Dept Fine Chem Res, Hangzhou 310012, Peoples R China.
 RP Sun, CQ, Jilin Univ, Dept Chem, Changchun 130023, Peoples R China.
 NR 9
 TC 3
 PU HIGHER EDUCATION PRESS
 PI BEIJING
 PA SHATANHOU ST 55, BEIJING 100009, PEOPLES R CHINA
 SN 0251-0790
 J9 CHEM J CHINESE UNIV-CHINESE
 JI Chem. J. Chin. Univ.-Chin.
 PD MAR
 PY 1998
 VL 19
 IS 3
 BP 382
 EP 384
 PG 3
 SC Chemistry, Multidisciplinary
 GA ZD364
 UT ISI:000072677800012
 ER
 
 
 PT J
 AU Abou-Seif, MAM
 TI Vanadium-mediated oxidation of NADH is enhanced by aluminium and
    inhibited by vitamin E and some copper (II) complexes
 SO ANNALS OF CLINICAL BIOCHEMISTRY
 LA English
 DT Article
 DE vanadium salts; superoxide dismutase-like activity
 ID SUPEROXIDE-DISMUTASE; RENAL-FAILURE; ANTIOXIDANTS; MECHANISMS;
    TOXICITY; BRAIN; ASSAY
 AB The effect of aluminium on vanadium-mediated oxidation of NADH was
    examined. The oxidation of NADH was enhanced in the presence of
    aluminium. The effect was concentration dependent. Vitamin E and copper
    (II) complexes with superoxide dismutase (COD)-like activities
    containing isobutyric acid hydrazine were rested for their effect on
    the vanadium-mediated oxidation of NADH. The stimulatory effect of
    aluminium was decreased upon addition of different concentrations of
    vitamin E and copper (II) complexes. These results indicate that the
    biological toxicity of aluminium may be attributed to its enhancement
    of the production of superoxide radicals (O-2(.-)) in association with
    the accumulation of other trace elements such as vanadium.
 C1 Mansoura Univ, Fac Sci, Dept Chem, Div Biochem, Mansoura, Egypt.
 RP Abou-Seif, MAM, Mansoura Univ, Fac Sci, Dept Chem, Div Biochem,
    Mansoura, Egypt.
 NR 27
 TC 4
 PU ROYAL SOC MEDICINE PRESS LTD
 PI LONDON
 PA 1 WIMPOLE STREET, LONDON W1M 8AE, ENGLAND
 SN 0004-5632
 J9 ANN CLIN BIOCHEM
 JI Ann. Clin. Biochem.
 PD NOV
 PY 1997
 VL 34
 PN Part 6
 BP 645
 EP 650
 PG 6
 SC Medical Laboratory Technology
 GA YZ024
 UT ISI:000072212500008
 ER
 
 
 PT J
 AU Schrock, RR
 TI High oxidation state coordination chemistry with triamidoamine tungsten
    and molybdenum complexes
 SO PURE AND APPLIED CHEMISTRY
 LA English
 DT Article
 ID PHOSPHORUS TRIPLE BOND; DINITROGEN COMPLEXES; CATALYTIC REDUCTION;
    CRYSTAL-STRUCTURE; HYDRAZINE; NITROGENASE; CLEAVAGE; VANADIUM; LIGANDS;
    CONTAIN
 AB In this lecture I will focus on some recent developments in the
    chemistry of high oxidation state dinitrogen complexes with an emphasis
    on recent results involving triamidoamine molybdenum complexes.
 RP Schrock, RR, MIT,DEPT CHEM 6331,CAMBRIDGE,MA 02139.
 NR 34
 TC 26
 PU BLACKWELL SCIENCE LTD
 PI OXFORD
 PA P O BOX 88, OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0NE
 SN 0033-4545
 J9 PURE APPL CHEM
 JI Pure Appl. Chem.
 PD OCT
 PY 1997
 VL 69
 IS 10
 BP 2197
 EP 2203
 PG 7
 SC Chemistry, Multidisciplinary
 GA YB877
 UT ISI:A1997YB87700026
 ER
 
 
 PT J
 AU Richards, RL
 TI Metal-sulfur chemistry and catalytic processes
 SO NEW JOURNAL OF CHEMISTRY
 LA English
 DT Article
 DE molybdenum; catalysis; sulfur; nitrogenase; xanthine oxidase;
    hydrodesulfurization
 ID IRON-MOLYBDENUM COFACTOR; CRYSTAL-STRUCTURE; XANTHINE-OXIDASE;
    DINITROGEN COMPLEX; THIOLATE COMPLEXES; NITROGEN-FIXATION;
    HYDRODESULFURIZATION; BINDING; HYDRAZINE; AMMONIA
 AB A number of processes involve metal catalysts where the metal carries
    sulfur-donor ligands. Three are discussed where metal complexes with
    S-donor ligands are being used to elucidate potential reaction
    pathways. This primarily involves the reductase nitrogenase and the
    metals vanadium, molybdenum, and iron but aspects of molybdenum
    chemistry involved in the function of the hydroxylase xanthine oxidase
    and of hydrodesulfurization of feedstock gases are also considered.
 RP Richards, RL, JOHN INNES CTR,NITROGEN FIXAT LAB,COLNEY LANE,NORWICH NR4
    7UH,NORFOLK,ENGLAND.
 NR 72
 TC 5
 PU GAUTHIER-VILLARS
 PI PARIS
 PA 120 BLVD SAINT-GERMAIN, 75280 PARIS, FRANCE
 SN 1144-0546
 J9 NEW J CHEM
 JI New J. Chem.
 PD JUN-JUL
 PY 1997
 VL 21
 IS 6-7
 BP 727
 EP 732
 PG 6
 SC Chemistry, Multidisciplinary
 GA XN485
 UT ISI:A1997XN48500009
 ER
 
 
 PT J
 AU Davies, SC
    Hughes, DL
    Janas, Z
    Jerzykiewicz, L
    Richards, RL
    Sanders, JR
    Sobota, P
 TI Vanadium complexes of the N(CH2CH2S)(3)(3-)-ligand with co-ligands
    relevant to nitrogen fixation processes
 SO CHEMICAL COMMUNICATIONS
 LA English
 DT Article
 ID HYDRAZINE
 AB Vanadium(III) and vanadium(V) complexes of the
    tris(2-thiolatoethyl)amine ligand L3- containing hydrazine, hydrazide,
    imide, ammine, cyanide and isocyanide ligands are synthesised; the
    complexes [V(NH3)L] and [V(NNMe2)L] have been structurally
    characterised.
 C1 JOHN INNES CTR PLANT SCI RES,NITROGEN FIXAT LAB,NORWICH NR4 7UH,NORFOLK,ENGLAND.
    WROCLAW B BEIRUT UNIV,FAC CHEM,PL-50383 WROCLAW,POLAND.
 NR 13
 TC 15
 PU ROYAL SOC CHEMISTRY
 PI CAMBRIDGE
 PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS,
    ENGLAND CB4 4WF
 SN 1359-7345
 J9 CHEM COMMUN
 JI Chem. Commun.
 PD JUL 21
 PY 1997
 IS 14
 BP 1261
 EP 1262
 PG 2
 SC Chemistry, Multidisciplinary
 GA XL701
 UT ISI:A1997XL70100003
 ER
 
 
 PT S
 AU Coucouvanis, D
    Demadis, KD
    Malinak, SM
    Mosier, PE
    Tyson, MA
    Laughlin, LJ
 TI Catalytic multielectron reduction of hydrazine to ammonia and acetylene
    to ethylene with clusters that contain the MFe(3)S(4) cores (M=Mo, V)
 SO TRANSITION METAL SULFUR CHEMISTRY
 SE ACS SYMPOSIUM SERIES
 LA English
 DT Review
 ID IRON MOLYBDENUM COFACTOR; LIGAND SUBSTITUTION-REACTIONS; BIOLOGICAL
    NITROGEN-FIXATION; CUBANE-TYPE CLUSTERS; X-RAY ABSORPTION; STRUCTURAL
    CHARACTERIZATION; AZOTOBACTER-VINELANDII; KLEBSIELLA-PNEUMONIAE;
    VANADIUM NITROGENASE; POSSIBLE RELEVANCE
 AB Clusters with the [MFe(3)S(4)](n+) core, (M = Mo, n=3; M = V, n=2). are
    used as catalysts for the reduction of substrates relevant to
    nitrogenase function. Substrates such as hydrazine and acetylene, are
    catalytically reduced by (NEt(4))(2)[(Cl-4-cat)(CH3CN)MoFe3S4Cl3], I,
    to ammonia and ethylene respectively, in the presence of added protons
    and reducing equivalents. Hydrazine also is catalytically reduced by
    the (NEt(4))[(DMF)(3)VFe3S4Cl3] cubane under similar conditions.
    Catalysis in excess of 100 turnovers (for hydrazine reduction) and in
    excess of 15 turnovers (for acetylene reduction) has been observed over
    a period of 24 hours. Kinetic studies of the acetylene reduction
    reaction have been carried out. Considerable evidence has been amassed
    which directly implicates the Mo and V atoms as the primary catalytic
    sites. The reduction of hydrazine is accelerated in the presence of
    carboxylate ligands bound to the Mo atom in I and this effect is
    interpreted in terms of a proton delivery shuttle involving the
    carboxylate group and the substrate during reduction. The possible role
    of the homocitrate ligand in the nitrogen cofactor is analyzed in terms
    of these findings.
 RP Coucouvanis, D, UNIV MICHIGAN,DEPT CHEM,ANN ARBOR,MI 48109.
 NR 77
 TC 8
 PU AMER CHEMICAL SOC
 PI WASHINGTON
 PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036
 SN 0097-6156
 J9 ACS SYMP SER
 PY 1996
 VL 653
 BP 117
 EP 134
 PG 18
 SC Chemistry, Multidisciplinary
 GA BG97E
 UT ISI:A1996BG97E00006
 ER
 
 
 PT J
 AU Kopka, K
    Mattes, R
 TI A dinuclear vanadium(V) complex with (eta(1))- and
    (mu-eta(2):eta(2))-bonded hydrazido(2-) ligands
 SO ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
 LA German
 DT Article
 DE vanadium(V) compounds; hydrazido(2-) complexes; crystal structure
 ID CRYSTAL-STRUCTURES; MOLECULAR-STRUCTURES; DINITROGEN; HYDRAZINE;
    DERIVATIVES; MODEL
 AB The title complex was obtained by reaction of guanidinium
    dioxodipicolinatovanadate(V) and N-methyl-N-phenylhydrazine. According
    to the single crystal structure analysis the dinuclear anion
    [(mu-PhNNH)(mu-OCH3){(MePhNN(dipic)V)}(2)](-) with sevenfold
    coordinated metal centers contains two types of hydrazido ligands. The
    Ligand [MePhNN](2-) is terminally bonded, and the VNN unit is linear
    with extensive electron delocalisation. The V-N and N-N bond lengths
    are 167.9(5) and 131.9(6) pm, respectively. The bonding of the bridging
    ligand is of the hitherto unknown mu-eta(2):eta(2) type, with V-N and
    N-N bond lengths of 202.5(5) and 136.5(5) pm, respectively. The V(N-2)V
    moiety is not planar. The compound was also characterized by H-1 and
    V-51 NMR spectroscopy.
 C1 UNIV MUNSTER,INST ANORGAN CHEM,D-48149 MUNSTER,GERMANY.
 NR 29
 TC 1
 PU VERLAG Z NATURFORSCH
 PI TUBINGEN
 PA POSTFACH 2645, W-7400 TUBINGEN, GERMANY
 SN 0932-0776
 J9 Z NATURFORSCH SECT B
 JI Z.Naturforsch.(B)
 PD DEC
 PY 1996
 VL 51
 IS 12
 BP 1675
 EP 1678
 PG 4
 SC Chemistry, Inorganic & Nuclear; Chemistry, Organic
 GA WD024
 UT ISI:A1996WD02400002
 ER
 
 
 PT J
 AU Coucouvanis, D
 TI Functional analogs for the reduction of certain nitrogenase substrates.
    Are multiple sites within the Fe/Mo/S active center involved in the
    6e(-) reduction of N-2?
 SO JOURNAL OF BIOLOGICAL INORGANIC CHEMISTRY
 LA English
 DT Editorial Material
 DE nitrogenase; analogs; function; catalysis; reduction
 ID IRON-MOLYBDENUM COFACTOR; MERCAPTO-CARBOXYLATE LIGANDS; STRUCTURAL
    CHARACTERIZATION; DOUBLE CUBANES; AZOTOBACTER-VINELANDII; VANADIUM
    NITROGENASE; CATALYTIC REDUCTION; CLOSTRIDIUM-PASTEURIANUM;
    POLYCARBOXYLATE LIGANDS; KLEBSIELLA-PNEUMONIAE
 AB Reactivity studies of clusters that contain the MFe(3)S(4) cores (M =
    Mo, V) with catecholate, multicarboxylate (or DMF) ligands coordinated
    to the Mo (or V) atoms, and Cl ligands coordinated to the Fe atoms have
    been carried out. These studies show the M/Fe/S single cubane clusters
    to be effective catalysts in the reduction of nitrogenase substrates
    such as hydrazine, acetylene and protons to give ammonia, ethylene and
    dihydrogen respectively. The same molecules do not activate or catalyze
    the reduction of dinitrogen. The results indicate that the observed
    catalyses are occurring at the Mo (V) sites by a process that, in the
    case of hydrazine, involves substrate protonation prior to reduction.
    The facile catalytic reduction of hydrazine by clusters that contain
    coordinatively saturated polycarboxylate-bound Mo atoms is rationalized
    in terms of a possible protonation/proton delivery function of the
    coordinated polycarboxylate ligands. The reactivity characteristics of
    the M/Fe/S clusters (structurally quite similar to the nitrogenase
    cofactor) have led to the suggestion that the Mo (V) atoms may be
    involved in the reduction of hydrazine in the later stages of
    dinitrogen reduction.
 RP Coucouvanis, D, UNIV MICHIGAN,DEPT CHEM,ANN ARBOR,MI 48109.
 NR 60
 TC 37
 PU SPRINGER VERLAG
 PI NEW YORK
 PA 175 FIFTH AVE, NEW YORK, NY 10010
 SN 0949-8257
 J9 J BIOL INORG CHEM
 JI J. Biol. Inorg. Chem.
 PD DEC
 PY 1996
 VL 1
 IS 6
 BP 594
 EP 600
 PG 7
 SC Biochemistry & Molecular Biology; Chemistry, Inorganic & Nuclear
 GA WA565
 UT ISI:A1996WA56500017
 ER
 
 
 PT J
 AU Durrant, MC
    Davies, SC
    Hughes, DL
    LeFloch, C
    Richards, RL
    Sanders, JR
    Champness, NR
    Pope, SJ
    Reid, G
 TI Crown thioether complexes of vanadium(II), vanadium(III) and
    vanadium(IV): X-ray crystal structure of [VCl3([9]aneS(3))]
 SO INORGANICA CHIMICA ACTA
 LA English
 DT Article
 DE vanadium complexes; macrocyclic thioether complexes; crystal structures
 ID NITROGENASE; AZOTOBACTER; PROTONATION; DINITROGEN; HYDRAZINE; AMMONIA;
    CUBANES; MO
 AB The synthesis of macrocyclic thioether complexes of vanadium(II),
    vanadium(III) and vanadium(IV) and the X-ray structure of [VCl3 ([9]
    aneS(3))] are described.
 C1 JOHN INNES CTR PLANT SCI RES,NITROGEN FIXAT LAB,NORWICH NR4 7UH,NORFOLK,ENGLAND.
    UNIV SOUTHAMPTON,DEPT CHEM,SOUTHAMPTON S09 5NH,HANTS,ENGLAND.
 NR 19
 TC 8
 PU ELSEVIER SCIENCE SA LAUSANNE
 PI LAUSANNE 1
 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND
 SN 0020-1693
 J9 INORG CHIM ACTA
 JI Inorg. Chim. Acta
 PD OCT 1
 PY 1996
 VL 251
 IS 1-2
 BP 13
 EP 14
 PG 2
 SC Chemistry, Inorganic & Nuclear
 GA VX967
 UT ISI:A1996VX96700004
 ER
 
 
 PT J
 AU LeFloch, C
    Henderson, RA
    Hitchcock, PB
    Hughes, DL
    Janas, Z
    Richards, RL
    Sobota, P
    Szafert, S
 TI Reactions of substituted hydrazines with vanadium(III) compounds:
    Crystal structures of [NH(2)Me(2)](2)[(VCl3)(2)(mu-NNMe(2))(3)],
    [V(OC6H3Pr2i-2,6)(3)(NH(2)NMe(2))(2)] and
    [V(OC6H3Pr2i-2,6)(3)(NH(2)NMePh)2]
 SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
 LA English
 DT Article
 ID MOLECULAR-STRUCTURE; COMPLEXES; DINITROGEN; BRIDGES; LIGANDS; GEOMETRY;
    AMMONIA; BONDS; ATOMS
 AB Reaction of Me(3)SiNHNMe(2) with [VCl3(PMePh(2))(2)] or [VCl3(thf)(3)]
    (thf = tetrahydrofuran) gave the triply hydrazide-bridged complex
    [NH(2)Me(2)](2)[(VCl3)(2)(mu-NNMe(2))(3)] 1 the crystal structure of
    which has been determined. Cyclic voltammetry shows 1 to have
    E(1/2)(ox) = 0.30 V (reversible at -35 degrees C) and E(2)(ox) = 1.35 V
    (vs. ferrocene-ferrocenium). Cation exchange gave
    [PPh(4)](2)[(VCl3)(2)(mu-NNMe(2))(3)] and reaction with
    Li(SC6H2Pr3i-2,4,6) gave
    [NH(2)Me(2)](2)[{V(SC6H2Pr3i-2,4,6)(3)}(2)(mu-NN(2)Me(2))(2)].
    Treatment of [V(OC6H3Pr2i-2,6)(4)Li(thf)] with NH(2)NMe(2) gave the
    low-melting compound [V(OC6H3Pr2i-2,6)(3)(NH(2)NMe(2))(2)], shown by
    astructure determination to be essentially trigonal bipyramidal, with
    axial hydrazine ligands. The analogue
    [V(OC6H3Pr2i-2,6)(3)(NH(2)NMePh)(2)] has also been prepared and shown
    to have a similar structure.
 C1 JOHN INNES CTR PLANT SCI RES,NITROGEN FIXAT LAB,NORWICH NR4 7UH,NORFOLK,ENGLAND.
    UNIV SUSSEX,SCH CHEM & MOLEC SCI,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND.
    WROCLAW B BEIRUT UNIV,INST CHEM,PL-50383 WROCLAW,POLAND.
 NR 32
 TC 13
 PU ROYAL SOC CHEMISTRY
 PI CAMBRIDGE
 PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS,
    ENGLAND CB4 4WF
 SN 0300-9246
 J9 J CHEM SOC DALTON TRANS
 JI J. Chem. Soc.-Dalton Trans.
 PD JUL 7
 PY 1996
 IS 13
 BP 2755
 EP 2762
 PG 8
 SC Chemistry, Inorganic & Nuclear
 GA UW625
 UT ISI:A1996UW62500024
 ER
 
 
 PT J
 AU Ramis, G
    Yi, L
    Busca, G
    Turco, M
    Kotur, E
    Willey, RJ
 TI Adsorption, activation, and oxidation of ammonia over SCR catalysts
 SO JOURNAL OF CATALYSIS
 LA English
 DT Article
 ID VANADIUM-OXIDE CATALYSTS; NITRIC-OXIDE; FT-IR; SELECTIVE OXIDATION;
    TITANIA CATALYSTS; NITROGEN-DIOXIDE; CR2O3 CATALYSTS; REDUCTION;
    SURFACE; NH3
 AB The catalytic activity in the reduction of NO by ammonia in the
    presence of oxygen (SCR process) is reported for CuO-TiO2 and for
    different catalysts belonging to the MgO-Fe2O3 system. These materials
    show high activity even at relatively low temperatures, with a maximum
    NO conversion near 520 K (CuO-TiO2) and 600 K (MgO-Fe2O3). At higher
    temperatures, NO conversion is reduced because of the competitive NH3
    oxidation by O-2 to NOx and N-2. The adsorption and transformation of
    ammonia over these systems has been investigated by FT-IR spectroscopy
    in vacuum and in contact with oxygen and NO. In all cases ammonia is
    first coordinated over Lewis sites and later undergoes hydrogen
    abstraction giving rise either to NH2 amide species or to its dimeric
    form N2H4, hydrazine, detected over CuO-TiO2 and gamma-Fe2O3. Other
    species tentatively identified as imide NH, nitroxyl HNO, nitrogen
    anions N-2(-) and azide anions N-3(-) are produced further. In the
    presence of NO3- coordinated ammonia rapidly disappears, the above
    intermediates are not found, and water is produced, showing that the
    SCR reaction occurred. Ammonia protonation to ammonium ion is not
    detected at all over these systems. It seems consequently demonstrated
    that Bronsted acidity is not necessary for the appearance of SCR
    activity. A comparison with the previously-published data on
    V2O5-TiO2-based systems is done and mechanisms of ammonia oxidation by
    oxygen and by NO are proposed. (C) 1995 Academic Press, Inc.
 C1 UNIV GENOA,FAC INGN,IST CHIM,I-16129 GENOA,ITALY.
    UNIV NAPLES FEDERICO II,DIPARTIMENTO INGN CHIM,I-80125 NAPLES,ITALY.
    NORTHEASTERN UNIV,DEPT CHEM ENGN,BOSTON,MA 02115.
 NR 72
 TC 75
 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS
 PI SAN DIEGO
 PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495
 SN 0021-9517
 J9 J CATAL
 JI J. Catal.
 PD DEC
 PY 1995
 VL 157
 IS 2
 BP 523
 EP 535
 PG 13
 SC Chemistry, Physical; Engineering, Chemical
 GA TK598
 UT ISI:A1995TK59800026
 ER
 
 
 PT J
 AU KOPKA, K
    MATTES, R
 TI DERIVATIVES OF HYDRAZINE AS LIGANDS IN VANADIUM(IV) AND VANADIUM(V)
    COMPLEXES - SYNTHESIS AND CRYSTAL-STRUCTURES OF 3 DIMERIC COMPLEXES
    WITH HYDRAZIDO AND HYDRAZONATO LIGANDS
 SO ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
 LA German
 DT Article
 ID OXOVANADIUM(IV)
 AB The complexes [(mu-PhCONNCOPh){VOCl(NHNHCOPh)(2)}]. 5 CH3CN, (1),
    [(mu-PhCONNCOPh)(V(dbh)}(2)]. 2 CH3CN, (2) and [(VO)(2)(tbh)], (3) have
    been prepared by reaction of VCl2(acac)(2), acac = acetylacetonato(1-),
    and VCl2(acpn), acpn = propylendiimino-bis(acetylacetonato(2-)), with
    benzoylhydrazine. The structures of the centrosymmetric dimeric
    molecules 1-3 have been determined by single crystal X-ray diffraction.
    1 and 2 contain both doubly deprotonated N,N'-dibenzoylhydrazine as
    bridging, doubly N,O chelating ligand. In 1 the two remaining
    coordination sites at the VOCl group are occupied by the hydrazido(1-)
    ligand [NHNHCOPh](-). 2 is a non-ore vanadium(IV) complex. The
    coordination geometry is approximately trigonal prismatic. The pi-back
    donating effect of the oxo function is substituted by back donation
    from three negatively charged enolic oxygen atoms. The V-O bond lengths
    range from 192.0(2) to 193.7(2) pm. 3 contains a unique highly
    symmetrical octadentate ligand, formed during the synthesis. It is
    coordinated to two oxovanadin(IV) centers by N,O chelation. The
    coordination geometry is square pyramidal.
 C1 UNIV MUNSTER,INST ANORGAN CHEM,D-48149 MUNSTER,GERMANY.
 NR 19
 TC 3
 PU VERLAG Z NATURFORSCH
 PI TUBINGEN
 PA POSTFACH 2645, W-7400 TUBINGEN, GERMANY
 SN 0932-0776
 J9 Z NATURFORSCH SECT B
 JI Z.Naturforsch.(B)
 PD SEP
 PY 1995
 VL 50
 IS 9
 BP 1281
 EP 1286
 PG 6
 SC Chemistry, Inorganic & Nuclear; Chemistry, Organic
 GA RX010
 UT ISI:A1995RX01000001
 ER
 
 
 PT J
 AU REDDY, CK
    KAKKAR, LR
 TI DETERMINATION OF VANADIUM BY EXTRACTION OF V(IV)-THIOCYANATE INTO ETHYL
    METHYL KETONE
 SO NATIONAL ACADEMY SCIENCE LETTERS-INDIA
 LA English
 DT Article
 DE VANADIUM; THIOCYANATE; ETHYL METHYL KETONE; SPECTROPHTOMETRIC
    DETERMINATION
 AB A simple and rapid method for the determination of vanadium has been
    worked out. In presence of hydrazine sulphate, vanadium forms a green
    coloured complex with thiocyanate in HCl solution, whose absorbance was
    measured at lambda(max) 675 nm, after extraction into ethyl methyl
    ketone. The method is free from the interference of several ions of
    analytical importance and can analyse satisfactorily samples df varying
    complexity. Vanadium and thiocyanate were present in the ratio of 1:2
    in the extracted species.
 RP REDDY, CK, KURUKSHETRA UNIV,DEPT CHEM,KURUKSHETRA 132119,HARYANA,INDIA.
 NR 0
 TC 2
 PU NATL ACAD SCIENCES INDIA
 PI ALLAHABAD
 PA 5 LAJPATRAI RD, ALLAHABAD 211002, INDIA
 SN 0250-541X
 J9 NATL ACAD SCI LETT
 JI Natl. Acad. Sci. Lett.-India
 PD SEP-OCT
 PY 1994
 VL 17
 IS 9-10
 BP 189
 EP 190
 PG 2
 SC Multidisciplinary Sciences
 GA QT344
 UT ISI:A1994QT34400007
 ER
 
 
 PT J
 AU MALINAK, SM
    DEMADIS, KD
    COUCOUVANIS, D
 TI CATALYTIC REDUCTION OF HYDRAZINE TO AMMONIA BY THE VFE3S4 CUBANES -
    FURTHER EVIDENCE FOR THE DIRECT INVOLVEMENT OF THE HETEROMETAL IN THE
    REDUCTION OF NITROGENASE SUBSTRATES AND POSSIBLE RELEVANCE TO THE
    VANADIUM NITROGENASES
 SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
 LA English
 DT Article
 ID IRON-SULFUR CLUSTERS; BRIDGED DOUBLE CUBANES; STRUCTURAL
    CHARACTERIZATION; AZOTOBACTER-CHROOCOCCUM; ELECTRONIC-PROPERTIES;
    STEPWISE SYNTHESIS; <MOFE3S4>3+ CORES; PROTEIN; <VFE3S4>2+; COFACTOR
 AB The catalytic behavior of synthetic Fe/V/S clusters that structurally
    resemble the Fe/V/S site of nitrogenase is reported. The
    [(L)(L')(L'')VFe3S4Cl3](n-) clusters (L, L', L'' = DMF, n = 1; L =
    PEt(3), L', L'' = DMF, n = 1; L, L' = 2,2'-bipyridyl, L'' = DMF, n = 1)
    that contain the [VFe3S4](2-) cuboidal core are effective catalysts in
    the reduction of hydrazine (a nitrogenase substrate) to ammonia in the
    presence of cobaltocene and 2,6-lutidine hydrochloride as sources of
    electrons and protons, respectively. Reactivity studies show that
    V-coordinated terminal ligands have a profound effect on the relative
    rates of hydrazine reduction. Specifically, as the number of labile
    solvent molecules coordinated to the V atom decreases, the relative
    rate of hydrazine reduction decreases. The behavior also is observed
    with the [(HBpz3)VFe3S4Cl3](2-) cubane (L, L', L'' =
    hydrotris(pyrazolyl)borate, n = 2), where all coordination sites on the
    V atom are ''blocked''. The latter shows no catalytic or stoichiometric
    hydrazine reduction and its structure has been determined. To
    investigate the role of the Fe sites in the [VFe3S4](2+) cubanes during
    catalysis, a series of cubanes [(DMF)(3)VFe(3)S(4)X(3)](-) (X = Cl-,
    Br-, or I-) was synthesized. Relative rates of hydrazine reduction with
    each catalyst were virtually identical, indicating little or no
    involvement of the Fe atoms during catalysis. The result's of this
    study strongly implicate the heterometal (V) as the site directly
    involved in the binding and activation of hydrazine. Additionally,
    reduction of phenylhydrazine to ammonia and aniline is observed in
    these systems. Importantly, the single cubane
    (Me(4)N)[(PhHNNH(2))(bpy)VFe3S4Cl3] has been synthesized, indicating
    the ability of a hydrazine-like substrate molecule to interact directly
    with the V atom. These reactivity studies are compared to those
    communicated previously for the reduction of hydrazine by the
    [MoFe3S4](3+) cuboidal core. Additionally, a plausible reaction pathway
    for the reduction of hydrazine-like substrates by the [VFe3S4](2+) core
    is presented. Implications regarding the function of the Fe/M/S (M = V,
    Mo) center in nitrogenase are discussed.
 C1 UNIV MICHIGAN,DEPT CHEM,ANN ARBOR,MI 48109.
 NR 45
 TC 53
 PU AMER CHEMICAL SOC
 PI WASHINGTON
 PA PO BOX 57136, WASHINGTON, DC 20037-0136
 SN 0002-7863
 J9 J AMER CHEM SOC
 JI J. Am. Chem. Soc.
 PD MAR 22
 PY 1995
 VL 117
 IS 11
 BP 3126
 EP 3133
 PG 8
 SC Chemistry, Multidisciplinary
 GA QN458
 UT ISI:A1995QN45800017
 ER
 
 
 PT J
 AU DENISOV, NT
    SHUVALOVA, NI
    SHILOV, AE
 TI A KINETIC-STUDY OF A VANADIUM(II)-MAGNESIUM HYDROXIDE SYSTEM
 SO KINETICS AND CATALYSIS
 LA English
 DT Article
 ID REDUCTION; NITROGEN
 AB The kinetics of the molecular nitrogen reduction of hydrazine by
    vanadium(II)-magnesium hydroxide is studied at P(N)2 = 0.506 - 3.54 MPa
    and 258 - 284 K.  The heat (-DELTAH = 17 kJ/mol) and entropy of the
    formation of the nitrogen complex (-DELTAS = 32 J mol-1 K-1) and the
    activation energy of the N2H4 formation (35 kJ/mol) are determined. 
    The conclusion is made that the reaction occurs with the participation
    of a tetranuclear cluster of V2+ ions in the cationic layer of the
    primary particle of the mixed hydroxide Mg(OH)2-V(OH)2.
 RP DENISOV, NT, RUSSIAN ACAD SCI,INST CHEM PHYS,CHERNO 142432,RUSSIA.
 NR 16
 TC 6
 PU MAIK NAUKA/INTERPERIODICA
 PI NEW YORK
 PA C/O PLENUM/CONSULTANTS BUREAU 233 SPRING ST, NEW YORK, NY 10013
 SN 0023-1584
 J9 KINET CATAL-ENGL TR
 JI Kinet. Catal.
 PD SEP-OCT
 PY 1994
 VL 35
 IS 5
 BP 700
 EP 704
 PG 5
 SC Chemistry, Physical
 GA PR892
 UT ISI:A1994PR89200016
 ER
 
 
 PT J
 AU HWANG, JS
    ALTURABI, MOH
    ELSAYED, L
 TI EPR AND SPECTROSCOPIC STUDIES OF
    BIS(S-METHYL-3-ISOPROPYLIDENEHYDRAZINECARBODITHIOATO)-OXOVANADIUM(IV)
    AS MODEL-COMPOUND FOR VANADIUM BOUND TO NITROGEN AND SULFUR HETEROATOMS
 SO ENERGY & FUELS
 LA English
 DT Article
 ID COORDINATION-COMPOUNDS; HYDRAZINE DERIVATIVES; TRANSITION-METALS;
    RESONANCE; COMPLEXES; ACID
 AB The synthesis and spectroscopic and EPR characterization of a vanadyl
    complex with acetone Schiff base,
    bis(S-methyl-3-isopropylidenehydrazinecarbodithioato)oxovanadium(IV),
    are described. The magnetic moment of 1.75 mu(B) at room temperature is
    close to the spin only magnetic moment (1.73 mu(B)). The experimental
    values of g(parallel-to) = 1.960 and g(perpendicular-to) = 1.988 and
    the normal occurence of nu(V=O) vibration suggest a monomeric
    five-coordinate square pyramical structure of the complex. A
    correlation was found between g(parallel-to) and A(parallel-to) of the
    title compound when compared with other model compounds of the vanadyl
    complexes in which possible combinations of four ligands may include
    all nitrogen (N4) and all sulfur (S4). This information could be useful
    in characterizing aqueous pyridine cuts of asphaltenes with molecular
    weights less than 400 found in some heavy crude oils.
 C1 ALEXANDRIA UNIV,FAC SCI,DEPT CHEM,ALEXANDRIA 21321,EGYPT.
 RP HWANG, JS, KING FAHD UNIV PETR & MINERALS,DEPT CHEM,DHAHRAN 31261,SAUDI
    ARABIA.
 NR 24
 TC 3
 PU AMER CHEMICAL SOC
 PI WASHINGTON
 PA 1155 16TH ST, NW, WASHINGTON, DC 20036
 SN 0887-0624
 J9 ENERG FUEL
 JI Energy Fuels
 PD MAY-JUN
 PY 1994
 VL 8
 IS 3
 BP 793
 EP 797
 PG 5
 SC Energy & Fuels; Engineering, Chemical
 GA NN798
 UT ISI:A1994NN79800039
 ER
 
 
 PT J
 AU SUNDHEIM, A
    THEERS, C
    MATTES, R
 TI SUBSTITUTED HYDRAZINES AS LIGANDS IN VANADIUM(III), VANADIUM(IV) AND
    VANADIUM(V) COMPLEXES - SYNTHESIS AND CHARACTERIZATION OF
    [V(DIPIC)(NH(2)NHCOPH)(H2O)][VO(DIPIC)(NHNCOPH)]CENTER-DOT-2H(2)O,
    [VO(DIPIC)(NHNHCO(2)ME)],
    [VO(DIPIC)(NH(2)NHCO(2)ME)],[VO(DIPIC)(NHNHCSPH)] AND
    [VO(ONO)(NHNHCOPH)]CENTER-DOT-2H(2)O
 SO ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
 LA German
 DT Article
 DE BENZOLHYDRAZINE COMPLEXES OF VANADIUM(III) AND -(V); METHYLCARBAZATE
    COMPLEXES OF VANADIUM(IV) AND -(V); THIOBENZOYLHYDRAZINE COMPLEXES OF
    VANADIUM(V); CRYSTAL STRUCTURE
 ID DIAZENIDO COMPLEXES; DIOXOMOLYBDENUM(VI) COMPLEXES;
    MOLECULAR-STRUCTURES; METHYLTHIOCARBAZATE; MOLYBDENUM; CRYSTAL; OXO
 AB The reaction of [VO(dipic)(H2O)(2)].2H(2)O with benzoylhydrazine,
    thiobenzoylhydrazine and O-methylcarbazate yields
    [V(dipic)(NH(2)NHCOPh)(H2O)(2)][VO(dipic)(NHNCOPh). 2H(2)O (1),
    [VO(dipic)(NHNHCO(2)Me)] (2), [VO(dipic)(NH(2)NHCO(2)Me)] (3) and
    [VO(dipic)(NHNHCSPh)] (4). 1 is probably formed in solution by redox
    disproportionation. The reactions giving 2, 3 and 4 also involve redox
    processes with atmospheric oxygen as oxidant and the respective
    hydrazine as reductant. [VO('ONO')(NHNHCOPh)].H2O (5) was formed using
    aqua-oxo-salicylaldehyde-L-alaninato-vanadium(IV) as precursor. The
    structures of 1,2, 3 and 5 have been determined by single crystal X-ray
    crystallography.
    The cation of 1 has a seven-coordinated vanadium(III) center with the
    two H2O molecules at the apices of a pentagonal bipyramide, the anion
    contains the doubly deprotonated hydrazido(2-) ligand NHNCOPh(2-) as
    N,O-chelate. 2 and 3 have very similar structures, but differ in the
    oxidation state of the vanadium atom and in the degree of deprotonation
    of the hydrazine. In 3 neutral NH(2)NHCOOMe and in 2 the single
    deprotonated hydrazido(1-) ligand NHNHCOOMe- are bound as N,O-chelates,
    with the O-donor in trans-position to the VO group. The remaining
    coordination sites are occupied by the ONO-donating dinegative dipic
    ligand. 5, where dipic is replaced by the three-dentate
    salicylaldehyde-benzoyl-hydrazone, has a very similar structure to 2. 4
    with a VO3N2S coordination sphere is the first vanadium(V) complex
    containing the N,S-donating hydrazido(1-) ligand NHNHCSPh(-). The
    following parameters are characteristic for the bonding of the NHNHR(-)
    and NHNR(2-) ligands in 1, 2 and 5: V-N 189 +/- 1 pm, N-N 134 +/- 1 pm
    and V-N-N 122 +/- 2 degrees.
 C1 WESTFAL WILHELMS UNIV,INST ANORGAN CHEM,D-48149 MUNSTER,GERMANY.
 NR 18
 TC 5
 PU VERLAG Z NATURFORSCH
 PI TUBINGEN
 PA POSTFACH 2645, W-7400 TUBINGEN, GERMANY
 SN 0932-0776
 J9 Z NATURFORSCH SECT B
 JI Z.Naturforsch.(B)
 PD FEB
 PY 1994
 VL 49
 IS 2
 BP 176
 EP 185
 PG 10
 SC Chemistry, Inorganic & Nuclear; Chemistry, Organic
 GA MY481
 UT ISI:A1994MY48100004
 ER
 
 
 PT J
 AU GUZMAN, R
    MORALES, J
    TIRADO, JL
 TI LITHIUM SOLVATION BY N-ALKYLAMINES IN THE INTERLAYER SPACE OF VANADIUM
    DISELENIDE
 SO SOLID STATE IONICS
 LA English
 DT Article
 ID TRANSITION-METAL DICHALCOGENIDES; INTERCALATION COMPLEXES; DISULFIDE;
    VSE2; TRANSPORT; HYDRAZINE; SULFIDES; TIS2
 AB Lithium and n-alkylamine molecules containing 1-16 carbon atoms were
    intercalated into layered vanadium diselenide. The reaction with amines
    is favoured by prior lithium intercalation. Alkylamines form double
    layers in the interlayer space between consecutive VSe2 slabs. Also,
    lithium is not exchanged with alkylammonium ions, but is largely
    retained in the form of solvated ions. The angle between the amine
    molecules and the host lattice layers is constant for the solvated ions
    but increases gradually with the size of the organic molecules in the
    alkylamine intercalates.
 RP GUZMAN, R, UNIV CORDOBA,FAC CIENCIAS,DEPT QIUM INORGAN & INGN QUIM,SAN
    ALBEROT MAGNO S-N,E-14004 CORDOBA,SPAIN.
 NR 33
 TC 0
 PU ELSEVIER SCIENCE BV
 PI AMSTERDAM
 PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
 SN 0167-2738
 J9 SOLID STATE IONICS
 JI Solid State Ion.
 PD DEC
 PY 1993
 VL 67
 IS 1-2
 BP 107
 EP 113
 PG 7
 SC Chemistry, Physical; Physics, Condensed Matter
 GA MR295
 UT ISI:A1993MR29500015
 ER
 
 
 PT J
 AU TSAGKALIDIS, W
    WOITHA, C
    REHDER, D
 TI HYDRAZINE COMPLEXES OF VANADIUM(II AND III)
 SO INORGANICA CHIMICA ACTA
 LA English
 DT Article
 ID AZOTOBACTER-CHROOCOCCUM; CRYSTAL-STRUCTURE; VFE-PROTEIN; NITROGENASE;
    DINITROGEN; FIXATION; SPECTRUM; CHLORIDE; LIGANDS; ENZYME
 AB The reaction of VCl3(thf)3 (1) with NN-dimethylhydrazine yields
    VCl3(thf)2(H2NNMe2) (2) or, with excess hydrazine,   VCl3(NH2NMe2)2    
     (4).   In   the   presence    of   1,2-bis(dimethylphosphino)ethane   
      (dmpe), VCl3(dmpe)(NH2NMe2).0.5thf (7) is obtained. As 1 is reacted
    with tris(3-dimethylphosphinopropyl)phosphine (tdmp) and lithium
    hydrazide, the V(II) species VCl2(tdmp)(NH2NMe2) (10) and VC]2(tdmp)
    (11) are formed. While H2NNMe2 coordinates end-on via its NH2 group in
    the case of 2, 7 and 10, 4 probably contains the two hydrazine ligands
    in a side-on bonding mode. The compounds were characterized by
    elemental analyses, IR, H-1 NMR and susceptibility measurements. The
    NH2 Protons are deshielded with respect to the free hydrazine by 3.8 to
    5.6 ppm. For comparison, the complexes VCl3(amine)x(thf), (amine =
    ethylenediamine, x and y = l, 5; tetramethylethylenediamine, x = 2, y =
    0, 6; N-aminopiperidine, x = 1, y = 2, 3) have also been prepared.
 C1 UNIV HAMBURG,DEPT CHEM,W-2000 HAMBURG 13,GERMANY.
 NR 21
 TC 15
 PU ELSEVIER SCIENCE SA LAUSANNE
 PI LAUSANNE 1
 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND
 SN 0020-1693
 J9 INORG CHIM ACTA
 JI Inorg. Chim. Acta
 PD MAR 15
 PY 1993
 VL 205
 IS 2
 BP 239
 EP 243
 PG 5
 SC Chemistry, Inorganic & Nuclear
 GA KV971
 UT ISI:A1993KV97100017
 ER
 
 
 PT J
 AU DILWORTH, MJ
    ELDRIDGE, ME
    EADY, RR
 TI THE MOLYBDENUM AND VANADIUM NITROGENASES OF AZOTOBACTER-CHROOCOCCUM -
    EFFECT OF ELEVATED-TEMPERATURE ON N2 REDUCTION
 SO BIOCHEMICAL JOURNAL
 LA English
 DT Article
 ID KLEBSIELLA-PNEUMONIAE; COMPONENT PROTEINS; PURIFICATION; COFACTOR;
    EVOLUTION; HYDRAZINE; HYDROGEN; ETHYLENE; PRODUCT; COMPLEX
 AB During the reduction of N, by V-nitrogenase at 30-degrees-C, some
    hydrazine (N2H4) is formed as a product in addition to NH3 [Dilworth
    and Eady (I 99 1) Biochem. J. 277, 465-468]. We show here the
    following. (1) That over the temperature range 30-45-degrees-C the
    apparent K(m) for the reduction of N2 to yield these products is the
    same, but increases from 30 to 58 kPa of N2. On increasing the
    temperature from 45-degrees-C to 50-degrees-C, little change occurred
    in the rate of reduction of protons to H-2; the rate of N2H4 production
    increased, but the rate of NH3 formation decreased 7-fold. (2)
    Temperature-shift experiments from 42 to 50-degrees-C or from 50 to
    42-degrees-C showed that this selective loss of the ability to reduce
    N2 to NH3 was reversible. The effects we observe are consistent with
    the existence of different conformers of the VFe-protein at the two
    temperatures, that predominating at 50-degrees-C being largely unable
    to reduce N2 to ammonia. (3) Measurement of the ratio between H-2
    evolution and N2 reduced to NH3 at N2 pressures up to 339 kPa for both
    Mo- and V-nitrogenases gave limiting H-2/N2 values of 1.13 +/- 0.13 for
    Mo-nitrogenase and 3.50 +/- 0.03 for V-nitrogenase. Since for
    Mo-nitrogenase our measured value for the ratio at 339 kPa is the same
    as that derived by Simpson and Buff is [(l 984) Science 224, 1095-1097]
    at 5650 kPa, there appears to be little or no divergence from the
    predictions based on the apparent K(m) for N2. These data then suggest
    that there may be a fundamentally different mechanism for N2 binding to
    V-nitrogenase compared with Mo-nitrogenase. (4) We did not detect any
    N2H4 as a product of N2 reduction by Mo-nitrogenase over the
    temperature range investigated; however, at 50-degrees-C this system
    reduced acetylene (C2H2) to yield some ethane (C2H6), in addition to
    ethylene (C2H4), a reaction normally associated with Mo-independent
    nitrogenases.
 C1 UNIV SUSSEX,AFRC,IPSR,NITROGEN FIXAT LAB,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND.
 RP DILWORTH, MJ, MURDOCH UNIV,SCH BIOL & ENVIRONM SCI,MURDOCH,WA
    6150,AUSTRALIA.
 NR 27
 TC 18
 PU PORTLAND PRESS
 PI LONDON
 PA 59 PORTLAND PLACE, LONDON, ENGLAND W1N 3AJ
 SN 0264-6021
 J9 BIOCHEM J
 JI Biochem. J.
 PD JAN 15
 PY 1993
 VL 289
 PN Part 2
 BP 395
 EP 400
 PG 6
 SC Biochemistry & Molecular Biology
 GA KJ143
 UT ISI:A1993KJ14300011
 ER
 
 
 PT J
 AU MAZZANTI, M
    KADKHODAYAN, M
    ARMSTRONG, WH
 TI CLEAVAGE OF THE HYDRAZINE N-N BOND BY VANADIUM(II) COMPLEXES
 SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
 LA English
 DT Meeting Abstract
 C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720.
 NR 0
 TC 0
 PU AMER CHEMICAL SOC
 PI WASHINGTON
 PA 1155 16TH ST, NW, WASHINGTON, DC 20036
 SN 0065-7727
 J9 ABSTR PAP AMER CHEM SOC
 JI Abstr. Pap. Am. Chem. Soc.
 PD APR 5
 PY 1992
 VL 203
 PN Part 2
 BP 461
 EP INOR
 PG 0
 SC Chemistry, Multidisciplinary
 GA HK162
 UT ISI:A1992HK16200870
 ER
 
 
 PT J
 AU DILWORTH, MJ
    EADY, RR
 TI HYDRAZINE IS A PRODUCT OF DINITROGEN REDUCTION BY THE
    VANADIUM-NITROGENASE FROM AZOTOBACTER-CHROOCOCCUM
 SO BIOCHEMICAL JOURNAL
 LA English
 DT Article
 ID X-RAY ABSORPTION; VFE PROTEIN; COFACTOR; PURIFICATION; MOLYBDENUM;
    CONTAINS; ENZYME
 AB During the enzymic reduction of N2 to NH3 by Mo-nitrogenase, free
    hydrazine (N2H4) is not detectable, but an enzyme-bound intermediate
    can be made to yield N2H4 by quenching the enzyme during turnover
    [Thorneley, Eady & Lowe (1978) Nature (London) 272, 557-558].  In
    contrast, we show here that the V-nitrogenase of Azotobacter
    chroococcum produces a small but significant amount of free N2H4 (up to
    0.5% of the electron flux resulting in N2 reduction) as a product of
    the reduction of N2.  The amount of N2H4 formed increased 15-fold on
    increasing the assay temperature from 20-degrees-C to 40-degrees-C. 
    Activity cross-reactions between nitrogenase components of Mo- and
    V-nitrogenases showed that the formation of free N2H4 was associated
    with the VFe protein.  These data provide the first direct evidence for
    an enzyme intermediate at the four-electron-reduced level during the
    reduction of N2 by V-nitrogenase.
 C1 UNIV SUSSEX,AFRC,INST PLANT SCI RES,NITROGEN FIXAT LAB,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND.
    MURDOCH UNIV,SCH BIOL & ENVIRONM SCI,MURDOCH,WA 6150,AUSTRALIA.
 NR 23
 TC 35
 PU PORTLAND PRESS
 PI LONDON
 PA 59 PORTLAND PLACE, LONDON, ENGLAND W1N 3AJ
 SN 0264-6021
 J9 BIOCHEM J
 JI Biochem. J.
 PD JUL 15
 PY 1991
 VL 277
 PN Part 2
 BP 465
 EP 468
 PG 4
 SC Biochemistry & Molecular Biology
 GA FX928
 UT ISI:A1991FX92800026
 ER
 
 
 PT J
 AU HILLS, A
    HUGHES, DL
    LEIGH, GJ
    SANDERS, JR
 TI REACTIONS OF VANADIUM(IV) HALIDE-COMPLEXES CONTAINING SCHIFF-BASE
    LIGANDS WITH HYDRAZINES - PREPARATION AND STRUCTURE OF
    [N,N'-ETHYLENEBIS(SALICYLIDENEIMINATO)]BIS-(PHENYLHYDRAZINE)VANADIUM(III
    ) IODIDE
 SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
 LA English
 DT Article
 ID MOLECULAR-STRUCTURE; CRYSTAL
 AB The complexes [VX2L] [L = N,N' -ethylenebis(salicylideneiminate)
    (salen) or N,N' -1,2-phenylenebis-(salicylideneiminate)(salphen), X =
    Cl or Br] have been prepared by established routes, but attempts to
    prepare the iodo-analogue led to other products, including
    [(salen)V(mu-m-O)VO(salen)][l(5)].  It is not possible to prepare
    hydrazine or hydrazide complexes directly from the dihalides, but
    [V(NH2NHPh)2-(salen)]\ was synthesised by an indirect route, and its
    structure determined by X-ray analysis.  The phenylhydrazines are bound
    end-on.  Several other new vanadium-(lll) and (lV) species are
    described.
 RP HILLS, A, UNIV SUSSEX,AFRC,INST PLANT SCI RES,NITROGEN FIXAT
    LAB,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND.
 NR 13
 TC 19
 PU ROYAL SOC CHEMISTRY
 PI CAMBRIDGE
 PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS,
    ENGLAND CB4 4WF
 SN 0300-9246
 J9 J CHEM SOC DALTON TRANS
 JI J. Chem. Soc.-Dalton Trans.
 PD FEB
 PY 1991
 IS 2
 BP 325
 EP 329
 PG 5
 SC Chemistry, Inorganic & Nuclear
 GA EX664
 UT ISI:A1991EX66400022
 ER
 
 
 PT J
 AU BULTITUDE, J
    LARKWORTHY, LF
    POVEY, DC
    SMITH, GW
    DILWORTH, JR
    LEIGHT, GJ
 TI THE CRYSTAL AND MOLECULAR-STRUCTURE OF
    BIS(1-METHYL-1-PHENYLHYDRAZINE)DICHLORO-(1-METHYL-1-PHENYLHYDRAZIDO(2-))
    VANADIUM(V) CHLORIDE, A COMPLEX CONTAINING 2 SIDE-ON-CO-ORDINATED
    HYDRAZINE MOLECULES
 SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS
 LA English
 DT Article
 C1 UNIV SURREY,DEPT CHEM,GUILDFORD GU2 5XH,SURREY,ENGLAND.
    UNIV SUSSEX,AFRC,NITROGEN FIXAT UNIT,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND.
 NR 10
 TC 32
 PU ROYAL SOC CHEMISTRY
 PI CAMBRIDGE
 PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS,
    ENGLAND CB4 4WF
 SN 0022-4936
 J9 J CHEM SOC CHEM COMMUN
 JI J. Chem. Soc.-Chem. Commun.
 PD DEC 15
 PY 1986
 IS 24
 BP 1748
 EP 1750
 PG 3
 SC Chemistry, Multidisciplinary
 GA F5082
 UT ISI:A1986F508200003
 ER
 
 
 PT J
 AU RAMBABU, C
    RAO, RS
    RAO, PVK
 TI TITRIMETRIC METHOD FOR THE DETERMINATION OF NICOTINOYL HYDRAZINE WITH
    VANADIUM(V)
 SO CURRENT SCIENCE
 LA English
 DT Note
 C1 ANDHRA UNIV,POSTGRAD EXTENS CTR,DEPT CHEM,NUZVID 521201,INDIA.
 RP RAMBABU, C, ANDHRA UNIV,DEPT CHEM,WALTAIR 530003,ANDHRA PRADESH,INDIA.
 NR 15
 TC 1
 PU CURRENT SCIENCE ASSN
 PI BANGALORE
 PA C V RAMAN AVENUE, PO BOX 8005, BANGALORE 560 080, INDIA
 SN 0011-3891
 J9 CURR SCI
 JI Curr. Sci.
 PY 1984
 VL 53
 IS 10
 BP 527
 EP 528
 PG 2
 SC Multidisciplinary Sciences
 GA ST303
 UT ISI:A1984ST30300006
 ER
 
 
 PT J
 AU RAO, PVK
    RAMABABU, C
    RAO, RS
 TI PHOTOMETRIC TITRATION OF NICOTINOYL HYDRAZINE WITH QUINQUIVALENT
    VANADIUM
 SO NATIONAL ACADEMY SCIENCE LETTERS-INDIA
 LA English
 DT Article
 RP RAO, PVK, ANDHRA UNIV,DEPT CHEM,WALTAIR 530003,ANDHRA PRADESH,INDIA.
 NR 7
 TC 0
 PU NATL ACAD SCIENCES INDIA
 PI ALLAHABAD
 PA 5 LAJPATRAI RD, ALLAHABAD 211002, INDIA
 SN 0250-541X
 J9 NATL ACAD SCI LETT
 JI Natl. Acad. Sci. Lett.-India
 PY 1980
 VL 3
 IS 5
 BP 150
 EP 152
 PG 3
 SC Multidisciplinary Sciences
 GA LH199
 UT ISI:A1980LH19900006
 ER
 
 
 PT J
 AU SHAROV, VA
    POVAROVA, NV
    KRYLOV, EI
 TI MECHANISM OF THERMAL-DECOMPOSITION OF TITANIUM, VANADIUM AND CHROMIUM
    OXALATES AND THEIR COMPLEXES WITH HYDRAZINE
 SO ZHURNAL NEORGANICHESKOI KHIMII
 LA Russian
 DT Article
 RP SHAROV, VA, NIZHNI TAGIL STATE TEACHERS INST,NIZHNI TAGIL,USSR.
 NR 21
 TC 2
 PU INST OBS NEORG KHIMII
 PI MOSCOW
 PA IM N S KURNAKOVA LENINSKI PROSPEKT 31, 71 MOSCOW, RUSSIA
 SN 0044-457X
 J9 ZH NEORG KHIM
 JI Zhurnal Neorg. Khimii
 PY 1980
 VL 25
 IS 8
 BP 2153
 EP 2157
 PG 5
 SC Chemistry, Inorganic & Nuclear
 GA KE082
 UT ISI:A1980KE08200025
 ER
 
 
 PT J
 AU STUKLOVA, MS
    PECHUROVA, NI
    SPITSYN, VI
 TI REACTION OF VANADIUM(V) WITH HYDRAZINE SULFATE IN THE PRESENCE OF
    CERTAIN COMPLEXONES
 SO BULLETIN OF THE ACADEMY OF SCIENCES OF THE USSR DIVISION OF CHEMICAL
    SCIENCE
 LA English
 DT Article
 RP STUKLOVA, MS, MV LOMONOSOV STATE UNIV,MOSCOW 117234,USSR.
 NR 9
 TC 1
 PU PLENUM PUBL CORP
 PI NEW YORK
 PA CONSULTANTS BUREAU, 233 SPRING ST, NEW YORK, NY 10013
 SN 0568-5230
 J9 BULL ACAD SCI USSR D CHEM SCI
 PY 1979
 VL 28
 IS 9
 BP 1791
 EP 1794
 PG 4
 SC Chemistry, Multidisciplinary
 GA JV726
 UT ISI:A1979JV72600002
 ER
 
 
 PT J
 AU SHEETS, RW
    BLYHOLDER, G
 TI ISOCYANATE FORMATION FROM ADSORBED CARBON-MONOXIDE AND AMMONIA OR
    HYDRAZINE ON VANADIUM, IRON, AND NICKEL
 SO JOURNAL OF PHYSICAL CHEMISTRY
 LA English
 DT Article
 C1 SW MISSOURI STATE UNIV,DEPT CHEM,SPRINGFIELD,MO 65802.
 NR 12
 TC 8
 PU AMER CHEMICAL SOC
 PI WASHINGTON
 PA 1155 16TH ST, NW, WASHINGTON, DC 20036
 SN 0022-3654
 J9 J PHYS CHEM
 JI J. Phys. Chem.
 PY 1975
 VL 79
 IS 15
 BP 1572
 EP 1573
 PG 2
 SC Chemistry, Physical
 GA AJ594
 UT ISI:A1975AJ59400020
 ER
 
 
 PT J
 AU WAHREN, M
 TI INFLUENCE OF ANIONS ON REDUCTION OF N2 TO HYDRAZINE USING
    VANADIUM(II)-MAGNESIUM(II) IN AQUEOUS-SOLUTION
 SO ZEITSCHRIFT FUR CHEMIE
 LA German
 DT Note
 C1 DAWB,ZENT INST ISOTOPEN & STRAHLENFORSCH,PERMOSER STR 15,705 LEIPZIG,GER DEM REP.
 NR 12
 TC 1
 PU DEUTSCHER VERLAG FUR GRUNDSTOFFINDUSTRIE
 PI LEIPZIG
 PA KARL HEINE STR 27B, 04229 LEIPZIG, GERMANY
 SN 0044-2402
 J9 Z CHEM
 PY 1975
 VL 15
 IS 6
 BP 242
 EP 243
 PG 2
 SC Chemistry, Multidisciplinary
 GA AJ208
 UT ISI:A1975AJ20800026
 ER
 
 
 PT J
 AU ROMANOV, VF
 TI EFFECT OF ETHANOL ON CATALYTIC PROPERTIES OF VANADIUM(V) COMPOUNDS IN
    REACTION OF HYDRAZINE OXIDATION BY CERIUM(IV) SULFATE
 SO UKRAINSKII KHIMICHESKII ZHURNAL
 LA Russian
 DT Article
 C1 LV PISARZHEVSKII PHYS CHEM INST,KIEV,UKSSR.
 NR 14
 TC 0
 PU ACADEMY SCIENCE UKRAINE
 PI KIEV 22
 PA PROSPECT SCIENCE 46,MSP, KIEV 22, UKRAINE 252650
 SN 0041-6045
 J9 UKR KHIM ZH
 PY 1975
 VL 41
 IS 2
 BP 115
 EP 119
 PG 5
 SC Chemistry, Multidisciplinary
 GA V7077
 UT ISI:A1975V707700001
 ER
 
 
 PT J
 AU SINGH, HM
    GYANI, BP
 TI OXIDATION OF PHENYL HYDRAZINE BY VANADIUM (V) IN AQUEOUS SULFURIC-ACID
    MEDIUM
 SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION
    A-PHYSICAL SCIENCES
 LA English
 DT Article
 C1 RANCHI UNIV,DEPT CHEM,RANCHI 8,INDIA.
 NR 10
 TC 0
 PU NATL ACAD SCIENCES INDIA
 PI ALLAHABAD
 PA 5 LAJPATRAI RD, ALLAHABAD 211002, INDIA
 J9 PROC NAT ACAD SCI INDIA A
 PY 1971
 VL 41
 BP 225
 EP 229
 PG 5
 SC Physics, Multidisciplinary
 GA U2605
 UT ISI:A1971U260500014
 ER
 
 
 PT J
 AU DOLGOREV, AV
    LUKACHIN.VV
    KARPOVA, OI
 TI USE OF HYDRAZINE DERIVATIVES IN ANALYTICAL-CHEMISTRY - REACTION OF
    VANADIUM WITH ANTHRANILIC ACID ACETONEHYDRAZIDE
 SO ZHURNAL ANALITICHESKOI KHIMII
 LA Russian
 DT Article
 C1 MOSCOW MINEROL GEOCHEM & RARE ELEMENT CRYST INST,MOSCOW,USSR.
 NR 11
 TC 0
 SN 0044-4502
 J9 ZH ANAL KHIM
 PY 1974
 VL 29
 IS 4
 BP 721
 EP 725
 PG 5
 SC Chemistry, Analytical
 GA S8267
 UT ISI:A1974S826700015
 ER
 
 
 PT J
 AU RAO, PVK
    RAO, GG
 TI POTENTIOMETRIC AND PHOTOMETRIC TITRATION OF VANADIUM(V) AND
    CHROMIUM(VI) WITH HYDRAZINE SULFATE
 SO INDIAN JOURNAL OF CHEMISTRY
 LA English
 DT Article
 C1 ANDHRA UNIV,DEPT CHEM,WALTAIR,INDIA.
 NR 20
 TC 1
 PU COUNCIL SCIENTIFIC INDUSTRIAL RESEARCH
 PI NEW DELHI
 PA PUBL & INFO DIRECTORATE, NEW DELHI 110012, INDIA
 J9 INDIAN J CHEM
 PY 1973
 VL 11
 IS 12
 BP 1309
 EP 1311
 PG 3
 SC Chemistry, Multidisciplinary
 GA S5887
 UT ISI:A1973S588700031
 ER
 
 
 PT J
 AU SOKOLSKI.DV
    DORFMAN, YA
    SHINDLER, YM
    EMELYANO.VS
 TI EFFECT OF ZINC(II) ON MAGNESIUM REDUCTION OF NITROGEN TO HYDRAZINE IN
    PRESENCE OF VANADIUM COMPOUNDS
 SO ZHURNAL NEORGANICHESKOI KHIMII
 LA Russian
 DT Note
 C1 ACAD SCI KASSR,ORG CATALYSIS & ELECTROCHEM INST,ALMA ATA,KASSR.
 NR 7
 TC 0
 PU INST OBS NEORG KHIMII
 PI MOSCOW
 PA IM N S KURNAKOVA LENINSKI PROSPEKT 31, 71 MOSCOW, RUSSIA
 SN 0044-457X
 J9 ZH NEORG KHIM
 JI Zhurnal Neorg. Khimii
 PY 1973
 VL 18
 IS 11
 BP 3135
 EP 3136
 PG 2
 SC Chemistry, Inorganic & Nuclear
 GA R2647
 UT ISI:A1973R264700058
 ER
 
 
 PT J
 AU RAO, PVK
    RAO, GG
 TI HYDRAZINE SULFATE AS REAGENT FOR TITRIMETRIC DETERMINATION OF
    VANADIUM(V) AND CHROMIUM(VI)
 SO TALANTA
 LA English
 DT Note
 C1 ANDHRA UNIV,DEPT CHEM,WALTAIR 530003,INDIA.
 NR 18
 TC 3
 PU ELSEVIER SCIENCE BV
 PI AMSTERDAM
 PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
 SN 0039-9140
 J9 TALANTA
 JI Talanta
 PY 1973
 VL 20
 IS 9
 BP 907
 EP 910
 PG 4
 SC Chemistry, Analytical
 GA Q6495
 UT ISI:A1973Q649500017
 ER
 
 
 PT J
 AU RAO, GG
    RAO, PVK
 TI TITRIMETRIC DETERMINATION OF VANADIUM(V) AND CHROMIUM(VI) ALONE AND IN
    MIXTURES WITH HYDRAZINE SULFATE IN PHOSPHORIC-ACID MEDIA
 SO ANALYTICA CHIMICA ACTA
 LA English
 DT Article
 C1 ANDHRA UNIV,DEPT CHEM,WALTAIR,INDIA.
 NR 21
 TC 5
 PU ELSEVIER SCIENCE BV
 PI AMSTERDAM
 PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
 SN 0003-2670
 J9 ANAL CHIM ACTA
 JI Anal. Chim. Acta
 PY 1973
 VL 65
 IS 2
 BP 347
 EP 356
 PG 10
 SC Chemistry, Analytical
 GA Q2066
 UT ISI:A1973Q206600012
 ER
 
 
 PT J
 AU ROMANOV, VF
    KONISHEV.GA
    YATSIMIR.KB
 TI CATALYTIC PROPERTIES OF OSMIUM COMPOUNDS - OXIDATION OF VANADIUM SODIUM
    HYDRAZINE
 SO ZHURNAL NEORGANICHESKOI KHIMII
 LA Russian
 DT Article
 C1 LV PISARZHEVSKII PHYS CHEM INST,KIEV,UKSSR.
 NR 19
 TC 3
 PU INST OBS NEORG KHIMII
 PI MOSCOW
 PA IM N S KURNAKOVA LENINSKI PROSPEKT 31, 71 MOSCOW, RUSSIA
 SN 0044-457X
 J9 ZH NEORG KHIM
 JI Zhurnal Neorg. Khimii
 PY 1972
 VL 17
 IS 12
 BP 3300
 EP 3305
 PG 6
 SC Chemistry, Inorganic & Nuclear
 GA O1922
 UT ISI:A1972O192200028
 ER
 
 
 PT J
 AU PRASAD, RK
    KUMAR, A
 TI OXIDATION OF HYDRAZINE BY VANADIUM
 SO JOURNAL OF THE INDIAN CHEMICAL SOCIETY
 LA English
 DT Note
 NR 5
 TC 4
 PU INDIAN CHEMICAL SOC
 PI CALCUTTA
 PA 92 ACHARYA PRAFULLA CHANDRA RD ATTN:DR INDRAJIT KAR/EXEC SEC, CALCUTTA
    700009, INDIA
 SN 0019-4522
 J9 J INDIAN CHEM SOC
 JI J. Indian Chem. Soc.
 PY 1972
 VL 49
 IS 8
 BP 819
 EP &
 PG 0
 SC Chemistry, Multidisciplinary
 GA N6271
 UT ISI:A1972N627100018
 ER
 
 
 PT J
 AU SOKOLSKI.DV
    SAPOVA, RG
    SHINDLER, YM
    DORFMAN, YA
    NOGERBEK.BY
 TI NITROGEN REDUCTION TO HYDRAZINE BY ZINC IN PRESENCE OF VANADIUM AND
    MAGNESIUM COMPOUNDS
 SO ZHURNAL OBSHCHEI KHIMII
 LA Russian
 DT Article
 NR 9
 TC 5
 PU MEZHDUNARODNAYA KNIGA
 PI MOSCOW
 PA 39 DIMITROVA UL., 113095 MOSCOW, RUSSIA
 SN 0044-460X
 J9 ZH OBSHCH KHIM
 JI Zhurnal Obshchei Khimii
 PY 1972
 VL 42
 IS 7
 BP 1425
 EP &
 PG 0
 SC Chemistry, Multidisciplinary
 GA N0660
 UT ISI:A1972N066000001
 ER
 
 
 PT J
 AU ROMANOV, VF
 TI CATALYTIC PROPERTIES OF VANADIUM(V) COMPOUNDS IN REACTION OF HYDRAZINE
    OXIDATION WITH CERIUM(V) SULFATE
 SO UKRAINSKII KHIMICHESKII ZHURNAL
 LA Russian
 DT Article
 NR 17
 TC 1
 PU ACADEMY SCIENCE UKRAINE
 PI KIEV 22
 PA PROSPECT SCIENCE 46,MSP, KIEV 22 252650, UKRAINE
 SN 0041-6045
 J9 UKR KHIM ZH
 PY 1972
 VL 38
 IS 2
 BP 132
 EP &
 PG 0
 SC Chemistry, Multidisciplinary
 GA L9303
 UT ISI:A1972L930300006
 ER
 
 
 PT J
 AU BENGTSSO.G
 TI KINETIC STUDY OF REDUCTION OF VANADIUM(V) BY HYDRAZINE IN STRONGLY ACID
    AQUEOUS SOLUTIONS
 SO ACTA CHEMICA SCANDINAVICA
 LA English
 DT Article
 NR 6
 TC 9
 PU MUNKSGAARD INT PUBL LTD
 PI COPENHAGEN
 PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK
 SN 0904-213X
 J9 ACTA CHEM SCAND
 JI Acta Chem. Scand.
 PY 1971
 VL 25
 IS 8
 BP 2989
 EP &
 PG 0
 SC Biochemistry & Molecular Biology; Chemistry, Multidisciplinary
 GA L2221
 UT ISI:A1971L222100021
 ER
 
 
 PT J
 AU DESHMUKH, GS
    BAPAT, MG
 TI BROMOMETRIC DETERMINATION OF VANADIUM(V) BY HYDRAZINE
 SO ANALYTICA CHIMICA ACTA
 LA English
 DT Article
 NR 7
 TC 4
 PU ELSEVIER SCIENCE BV
 PI AMSTERDAM
 PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
 SN 0003-2670
 J9 ANAL CHIM ACTA
 JI Anal. Chim. Acta
 PY 1956
 VL 14
 IS 3
 BP 225
 EP 227
 PG 3
 SC Chemistry, Analytical
 GA WM047
 UT ISI:A1956WM04700005
 ER
 
 
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