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• W1551531408 abstract "The reactions between niobium alkoxides [Nb(OR)5]2 (R=Pri, Et) and pinacol HOCMe2CMe2OH (pinH2) were investigated in different stoichiometries in toluene at room temperature. Nb4O4(pin)2(OPri)8 (1), [Nb2O(pin)4H2(OPri)2]m (2) and Nb3O3(pin)6H (3) were isolated. The various products were characterized by elemental analyses, FT-IR and 1H NMR spectroscopy and by X-ray diffraction for 1 and 3. The niobium atoms are all six-coordinated. The Nb–O bond lengths vary according to Nb–OPri<Nb–μO<Nbμ3–O∼Nb–O(pin). The structure of [Nb3(μ-O)2(μ,η2-pin)2(η2-pin)4H] is based on a bent open-shell framework with a short intramolecular O…O contact of 2.48 Å suggesting hydrogen bonding. The structure of [Nb4(μ-O)2(μ3-O)2(μ, η2)-pin)2(OPri)8] corresponds to a rhombus." @default.
• W1551531408 created "2016-06-24" @default.
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• W1551531408 date "1999-01-01" @default.
• W1551531408 modified "2023-10-17" @default.
• W1551531408 title "Niobium pinacolate complexes: synthesis and molecular structures of Nb3(μ-O)2(μ, η2-OCMe2CMe2O)2(η2-OCMe2CMe2O)4H and of Nb4(μ-O)2(μ3-O)2(μ, η2-OCMe2CMe2O)2(OPri)8" @default.
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• W1551531408 doi "https://doi.org/10.1016/s0277-5387(98)00368-4" @default.
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