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Gerard Parkin - One of the best experts on this subject based on the ideXlab platform.
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reactivity of cyclopentadienyl Molybdenum Compounds towards formic acid structural characterization of cpmo pme3 co 2h cpmo pme3 2 co h cpmo μ o μ o2ch 2 and cp mo μ o μ o2ch 2
Inorganic Chemistry, 2017Co-Authors: Michelle C Neary, Gerard ParkinAbstract:The molecular structures of CpMo(PMe3)(CO)2H and CpMo(PMe3)2(CO)H have been determined by X-ray diffraction, thereby revealing four-legged piano-stool structures in which the hydride ligand is trans to CO. However, in view of the different nature of the four basal ligands, the geometries of CpMo(PMe3)(CO)2H and CpMo(PMe3)2(CO)H deviate from that of an idealized four-legged piano stool, such that the two ligands that are orthogonal to the trans H–Mo–CO moiety are displaced towards the hydride ligand. While CpRMo(PMe3)3–x(CO)xH (CpR = Cp, Cp*; x = 1, 2, 3) are catalysts for the release of H2 from formic acid, the carbonyl derivatives, CpRMo(CO)3H, are also observed to form dinuclear formate Compounds, namely, [CpRMo(μ-O)(μ-O2CH)]2. The nature of the Mo···Mo interactions in [CpMo(μ-O)(μ-O2CH)]2 and [Cp*Mo(μ-O)(μ-O2CH)]2 have been addressed computationally. In this regard, the two highest occupied molecular orbitals of [CpMo(μ-O)(μ-O2CH)]2 correspond to metal-based δ* (HOMO) and σ (HOMO–1) orbitals. The σ2δ*2...
V A Likholobov - One of the best experts on this subject based on the ideXlab platform.
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mechanochemical synthesis of nanocrystalline nickel Molybdenum Compounds and their morphology and application in catalysis ii effect of mechanochemical activation parameters process power density and exposure time on the composition and structure of
Kinetics and Catalysis, 2014Co-Authors: O A Knyazheva, O N Baklanova, A V Lavrenov, V A Drozdov, N N Leonteva, V A Likholobov, A V Vasilevich, A V ShilovaAbstract:The effect of mechanochemical activation parameters-process power density and the time of treatment of a mixture of nickel hydroxocarbonate NiCO3 · 2Ni(OH)2 · nH2O and ammonium paramolybdate (NH4)6Mo7O24 · 4H2O -on the phase composition, specific surface area, and morphology of mechanically activated products at different Ni: Mo atomic ratios was studied. It was found that, at a mechanochemical activation process power density of 6.2 W/g, layered transition metal molybdates (LTM Compounds) with different amounts of crystal water were the constituents of the products, whereas the products mechanically activated at a power density of 28.0 W/g contained a mixture of LTM Compounds and heteropoly Compounds with the Anderson structure regardless of activation time.
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mechanochemical synthesis of nanocrystalline nickel Molybdenum Compounds their morphology and application in catalysis i effect of the ni mo atomic ratio on the structure and properties of nickel Molybdenum Compounds prepared under mechanochemical sy
Kinetics and Catalysis, 2011Co-Authors: O A Knyazheva, O N Baklanova, A V Lavrenov, V A Drozdov, N N Leonteva, M V Trenikhin, A B Arbuzov, V A LikholobovAbstract:Mechanochemical activation in high-energy planetary activators was used for the preparation of highly dispersed nickel-Molybdenum Compounds. Nickel hydroxocarbonate [NiCO3 · 2Ni(OH)2 · nH2O] and ammonium paramolybdate [(NH4)6Mo7O24 · 4H2O] were chosen as starting Compounds. The effect of the Ni: Mo atomic ratio on the composition and structure of products formed in the process of mechanochemical activation followed by calcination was studied. It was found that, at the Ni: Mo atomic ratios of 1.0 and 1.4, the mechanically activated product after calcination at 520°C contained 70–100% β-NiMoO4, which is a stable phase at temperatures lower than 180°C.
Partha Basu - One of the best experts on this subject based on the ideXlab platform.
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synthesis electrochemistry geometric and electronic structure of oxo Molybdenum Compounds involved in an oxygen atom transferring system
Journal of Inorganic Biochemistry, 2008Co-Authors: Raghvendra S Sengar, Victor N Nemykin, Partha BasuAbstract:The oxygen atom transfer reactivity of Tp*MoO2(SPh) (1) (where Tp* = hydrotris-(3,5dimethylpyrazol-1-yl)borate) with trimethyl phosphine (PMe3) has been investigated. The reaction proceed through a diamagnetic phosphoryl intermediate complex, Tp*MoO(SPh)(OPMe3) (2), which has been isolated and characterized by IR, NMR, UV-visible spectroscopy, and mass spectrometry. The molecular structure of 2 has been determined by X-ray crystallography. The complex crystallizes in monoclinic (P21/n) space group, a = 19.81 (1) A, b = 11.1 (4) A, c = 18.416 (5) A, β= 121.2 (3)°, V = 3463.8(25) A 3 with Z = 4. In acetonitrile, complex 2 exchanges its
Michelle C Neary - One of the best experts on this subject based on the ideXlab platform.
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reactivity of cyclopentadienyl Molybdenum Compounds towards formic acid structural characterization of cpmo pme3 co 2h cpmo pme3 2 co h cpmo μ o μ o2ch 2 and cp mo μ o μ o2ch 2
Inorganic Chemistry, 2017Co-Authors: Michelle C Neary, Gerard ParkinAbstract:The molecular structures of CpMo(PMe3)(CO)2H and CpMo(PMe3)2(CO)H have been determined by X-ray diffraction, thereby revealing four-legged piano-stool structures in which the hydride ligand is trans to CO. However, in view of the different nature of the four basal ligands, the geometries of CpMo(PMe3)(CO)2H and CpMo(PMe3)2(CO)H deviate from that of an idealized four-legged piano stool, such that the two ligands that are orthogonal to the trans H–Mo–CO moiety are displaced towards the hydride ligand. While CpRMo(PMe3)3–x(CO)xH (CpR = Cp, Cp*; x = 1, 2, 3) are catalysts for the release of H2 from formic acid, the carbonyl derivatives, CpRMo(CO)3H, are also observed to form dinuclear formate Compounds, namely, [CpRMo(μ-O)(μ-O2CH)]2. The nature of the Mo···Mo interactions in [CpMo(μ-O)(μ-O2CH)]2 and [Cp*Mo(μ-O)(μ-O2CH)]2 have been addressed computationally. In this regard, the two highest occupied molecular orbitals of [CpMo(μ-O)(μ-O2CH)]2 correspond to metal-based δ* (HOMO) and σ (HOMO–1) orbitals. The σ2δ*2...
K.r. Williams - One of the best experts on this subject based on the ideXlab platform.
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Electrocatalytic activity of some carburised nickel, tungsten and Molybdenum Compounds
Electrochimica Acta, 1997Co-Authors: C.j. Barnett, G.t. Burstein, Anthony Kucernak, K.r. WilliamsAbstract:Carburisation of some Compounds of nickel, tungsten and Molybdenum produces powders which show considerable passivity in sulphuric acid at elevated temperature, and which also show some catalytic activity towards the electro-oxidation of methanol and of hydrogen. Of those materials examined, carburised nickel-tungsten, prepared by reduction of nickel tungstate, shows a wide potential range of passivity, and is electroactive towards the anodic oxidation of methanol. The corresponding nickel-Molybdenum material shows higher corrosion rates, and some electrocatalytic activity towards the anodic oxidation of hydrogen, but with little detectable catalysis of the methanol oxidation reaction. Reduced nickel and reduced iron on their own give high corrosion rates with no detectable electrocatalytic activity for fuel oxidation. Tungsten carbide on its own shows a high degree of passivity in sulphuric acid, but no electrocatalytic activity for methanol oxidation.