Determination by electron diffraction of the molecular structures of chloro- and bromo-tri(trimethylsilyl)methane in the gas phase
作者:Paul T. Brain、Mathias Mehta、David W. H. Rankin、Heather E. Robertson、Colin Eaborn、J. David Smith、Alexander D. Webb
DOI:10.1039/dt9950000349
日期:——
The molecular structures of chloro- and bromo-tris (trimethylsilyl)methane in the gas phase have been determined by electron diffraction. Both molecules have inner Si–C bonds which are longer than normal and wide Si–C–Si angles. Principal parameters (ra) for CCl (SiMe3)3, with estimated standard deviations in parentheses, are r(C–Cl) 182.3 (15) pm, r(Si–Cinner) 193.9(6) pm, r(Si–Couter) 188.2(2) pm
气相中的氯和溴三(三甲基甲硅烷基)甲烷的分子结构已经通过电子衍射确定。这两个分子都具有内部Si–C键,该键长于正常且宽的Si–C–Si角。CCl(SiMe 3)3的主要参数(r a)(括号中带有标准偏差)为r(C–Cl)182.3(15)pm,r(Si–C内部)193.9(6)pm,r(Si –C外部)188.2(2)pm,以及角度Cl–C–Si 102.7(5)°和C外部–Si–C外部109.6(4)°。三个三甲基甲硅烷基从交错位置扭曲14.6(7)°,并从分子三重轴倾斜1.3(6)°。对于CBr(SiMe 3)3,主要参数为r(C-Br)191.1(35)pm,r(Si-C内部)195.4(15)pm,r(Si-C外部)187.7(3)pm,Br –C–Si 106.5(6)°和C外部–Si–C外部109.3(5)°。三甲基甲硅烷基基团从稳定位置扭曲13.5(7)°,但这些基团的倾斜角无法确定。