分子振光谱中的吸电子效应和供电子效应

本文就分子振动光谱中的吸电子效应和供电子效应提出了新观点：对共价键来说，吸电子效应使化学键强度增加，因而伸缩振动频率升高；供电子效应使供价键强度减弱，因而伸缩振动频率降低。对于配价键而言，如果取代基和配价键中提供电子对的原子相连，则供电子取代基使配价键加强，因而配价键的伸缩振动频率升高；吸电子取代基使配价键减弱，因而其伸缩振动频率降低。如果取代基和配价键中的受电子原子相连，则取代基的电子效应正好相

The Electrophilic and Electrophobic Effect in Molecular Vibration Spectra

A new point of view for electronic effect of mol ecular vibration spectra was brought:the electrophilic effect of substitution gr oup can enhance the strength of covalent bond.Therefore,its stretching vibration frequency will be increased.Contrarily,electrophobic effect makes frequency dec rease.As far as the coordination bond is concerned,if electrophobic substitution group links up the atom which provides the electron doublet then the strength o f coordination bond will be enhanced and the stretching vibration frequency of t he bond will be increased.The electrophilic substitution group makes the frequen cy decrease.If substitution group links with the atom that accepts electron,the electronic effect of substitution group is on the contrary.