Conformational stability of ethyl chlorogermane from temperature-dependent FT-IR spectra of krypton solutions and r0 structural parameters of methyl chlorogermane and ethyl germane
作者:James R Durig、Chunhua Pan、Gamil A Guirgis
DOI:10.1016/s0022-2860(01)00917-6
日期:2002.4
estimated that 80% of the sample is in the gauche form at ambient temperature. A complete vibrational assignment is proposed for both the gauche and trans conformers based on infrared band contours, relative intensities, depolarization values, and group frequencies which is supported by normal coordinate calculations utilizing the force constants from the ab initio MP2/6-31G(d) calculations. The optimized
摘要 已记录液体和固体的拉曼光谱(3200–30 cm -1 )以及气体和固体乙基氯锗烷 CH 3 CH 2 GeH 2 Cl 的红外光谱。已经对溶解在液态氪中的样品的红外光谱进行了变温(-105 至 -150 °C)研究。根据这些数据,已确定焓差为 143±30 cm -1 (1.71±0.36 kJ mol -1 ),具有更稳定的形式,gauche 构象异构体,这与从头计算的预测一致Hartree-Fock 能级,并通过微扰方法与二阶电子相关。据估计,在环境温度下,80% 的样品呈胶状。基于红外波段轮廓、相对强度、去极化值和群频率,这些频率由法线坐标计算支持,使用 ab initio MP2/6-31G(d) 计算中的力常数。优化的几何形状和构象稳定性也已从使用几个不同的具有全电子相关性的基组通过高达 MP2/6-311+G(2d,2p) 的微扰方法从头计算获得。甲基氯锗烷和乙基锗烷的