Infrared Spectra of Vinyl Chloride and Vinyl Chloride-d3

Abstract

Vinyl chloride‐d₃ has been prepared and the infrared spectrum has been obtained in the region from 400 to 4000 cm^‐1. The spectrum is compared with the that of vinyl chloride. Normal coordinate analyses are made for vinyl chloride and vinyl chloride‐d₃. A force field of the Urey‐Bradley type is used for the planar vibrations, and a modified valence‐type potential function is applied to the nonplanar motions. The vibrational secular equations are set up in the GF matrix fashion. The force constants are determined by a least‐square process. The force constants established for vinyl chloride are used to calculate the fundamental frequencies of vinyl chloride‐d₃. Satisfactory results are obtained.