CH Stretching Vibration of Hexachlorocyclohexane lsomers

Abstract

Infrared spectra of hexachiorocyclohexane (BHC) isomers were precisely measured in CH stretching region as rnodel compounds for the investigation of CH stretching vibration of sugar.
One band whlch seems to be independent of the molecular structure appears at 2976 1cm-1 in the spectra of all the isomers measured except B-isomer, while the frequencies and numbers of the ether bands depend upon the configurations. Based on the normal vibrations of BHC igomers calculated by a simple method which takes into account only the stretching vibrations of CH bonds, the ebserved bands were assigned. The cenfiguratien-dependenee of the CH vibration was well interpreted as the result of 1, 2- anct 1, 3-diaxial interactions,