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• W2056548838 abstract "The gas-phase structures of the conformers of 1,4-disilabutane and 1,5-disilapentane have been analyzed from electron-diffraction data augmented by flexible restraints derived from ab initio calculations. This allowed the simultaneous refinement of 22 and 29 parameters for 1,4-disilabutane and 1,5-disilapentane, respectively. 1,4-Disilabutane has been found to be present in the vapour predominantly in the anti (A) form (76(2)% from the experiment, 83% predicted by theory). Consistency in the geometries is found between theoretical predictions and experimental findings, except for the torsion angle ∠(SiCCSi) of the gauche (G) conformer [exptl 78.5(21)°, theor 68.0°]. The AA conformer of 1,5-disilapentane was always found to be the lowest energy structure, while some doubt still remains about the ordering of the AG and G(+)G(−) conformers. The AA conformer is found to be the sole form present in the crystal [C2/c, a = 15.585(8), b = 4.704(3), c = 9.895(6) Å, β = 95.77(4)°, Z = 4]. Good agreement is found for geometrical parameters determined experimentally in the gas phase and solid state and calculated by ab initio methods. The following values represent the most important distances (rg/Å) and angles (∠g/deg) found for the gas phase and crystal structures. 1,4-Disilabutane GED (A/G, esd's correspond to 1σ): r(CSi) 1.882(1)/1.885(1), r(CC) 1.563(5)/1.563(5), r(SiH) both 1.499(3), ∠(CCSi) 110.7(2)/114.4(5), ∠(SiCCSi) 180.0/78.5(21). 1,5-Disilapentane GED [AA/G(+)G(−)]: r(CSi) 1.886(1)/1.888(1), r(CC) 1.537(2)/1.539(2), r(SiH) both 1.487(4), ∠(CCC)114.8(7)/118.8(7), ∠(CCSi) 114.1(4)/116.8(7), ∠(SiCCC) 180.0/60.9(10); X [%, AA/AG/G(+)G(−)] 28(4)/40(5)/26(6). 1,5-Disilapentane XRD: r(CSi) 1.868(2), r(CC) 1.527(2), ∠(CCC) 113.8(2), ∠(CCSi) 115.2(1), ∠(SiCCC) 180.0(1)." @default.
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• W2056548838 modified "2023-10-03" @default.
• W2056548838 title "Conformational Analysis of 1,4-Disilabutane and 1,5-Disilapentane by Combined Application of Gas-Phase Electron Diffraction and <i>ab Initio</i> Calculations and the Crystal Structure of 1,5-Disilapentane at Low Temperatures" @default.
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• W2056548838 doi "https://doi.org/10.1021/jp9600468" @default.
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