首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Vibrational spectra and ab initio analysis of tert-butyl, trimethylsilyl, trimethylgermyl, trimethylstannyl, and trimethylplumbyl derivatives of 3,3-dimethylcyclopropene X. Some regularities
Authors:Panchenko Yu N  De Maré G R  Pupyshev V I  Abramenkov A V
Institution:Laboratory of Molecular Spectroscopy, Division of Physical Chemistry, Department of Chemistry, MV Lomonosov Moscow State University, Moscow, Russian Federation. panchenk@phys.chem.msu.ru
Abstract:The changes in the vibrational frequencies of 1-tert-butyl and 1,2-di-tert-butyl derivatives of 3,3-dimethylcyclopropene brought about by substitution of the central carbon atom (X) of the tert-butyl moieties by Si, Ge, Sn, or Pb atoms are examined. The most important decrease in the vibrational frequencies implicating the X(CH(3))(3) moieties is noted for substitution of X=C by Si. The substitutions of Si by Ge or Ge by Sn or Sn by Pb are not accompanied by the pronounced frequency shifts observed for the C-->Si transition. An explanation is given for trends in these vibrational frequencies for the transitions X=C-->Si-->Ge-->Sn-->Pb. It is concluded that there are lower limiting values of the vibrational frequencies of a molecular moiety which are approached when the mass of its isovalent atom is increased. This leads to the formation of cluster regions in the vibrational spectra for the frequencies of the SnC(3) and PbC(3) moieties.
Keywords:3  3-Dimethyl-1  2-bis(tert-butyl)cyclopropene  3  3-Dimethyl-1  2-bis(trimethylsilyl)cyclopropene  3  3-Dimethyl-1  2-bis(trimethylgermyl)cyclopropene  3  3-Dimethyl-1  2-bis(trimethylstannyl)cyclopropene  3  3-Dimethyl-1-(t-butyl)cyclopropene  3  3-Dimethyl-1-(trimethylsilyl)cyclopropene  3  3-Dimethyl-1-(trimethylgermyl)cyclopropene  3  3-Dimethyl-1-(trimethylstannyl)cyclopropene  3  3-Dimethyl-1-(trimethylplumbyl)cyclopropene  Isovalent heteroatoms  Vibrational spectra
本文献已被 ScienceDirect PubMed 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号