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• W1567121266 abstract "The crystal and molecular structures of trimethylsilylpentacarbonylrhenium, Me3SiRe(CO)5, and [tris(trimethylsilyl)silyl]pentacarbonylrhenium, (Me3Si)3SiRe(CO)5 have been determined from three-dimensional X-ray data obtained by counter methods. Me3SiRe(CO)5 crystallises in space group P21/c of the monoclinic system with four molecules in a unit cell of dimensions: a = 6.972(4), b = 13.418(6), c = 13.400(5) Å, β 91.85(5)°. The observed and calculated densities are 2.11 (±0.01) and 2.12 g cm−3 respectively. Block-diagonal least-squares refinement of the structure has led to a final value of the conventional R factor of 0.080 for the 1297 independent reflections having Fo2 > 3σ (Fo2). (Me3Si)3SiRe(CO)5 crystallises in the triclinic space group P1 with two molecules in a unit cell of dimensions: a = 9.131(2), b = 9.358(2), c = 15.931(3) Å, α 84.78(2), β 105.46(2), γ 111.99(2)°. The observed and calculated densities are 1.56 (±0.01) and 1.57 g cm−3 respectively. Block-diagonal least-squares refinement of the structure has led to a final value of the conventional R factor of 0.060 for the 1149 independent reflections having Fo2 > 3 σ (Fo2). For both structures, the coordination geometry about the rhenium atom is approximately octahedral, and, about the silicon atom bonded to the rhenium atom, tetrahedral. The relative orientations of carbonyl and methyl (or trimethylsilyl) groups, when viewed down the ReSi bond, appear consistent with minimisation of energy due to non-bonded interactions. In Me3SiRe(CO)5 all four of the equatorial carbonyl groups are displaced out of the equatorial plane towards the silicon ligand by about 5°.The SiRe bond is 2.600(1) Å long. In (Me3Si)3SiRe(CO)5 only one of the equatorial carbonyl groups is displaced out of the equatorial plane towards the silicon ligand by 6 °. The SiRe bond is 2.665(9) Å long." @default.
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• W1567121266 date "1976-03-01" @default.
• W1567121266 modified "2023-09-23" @default.
• W1567121266 title "Polysilane derivatives of the transition metals" @default.
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• W1567121266 doi "https://doi.org/10.1016/s0022-328x(00)91525-0" @default.
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