Abstract
Infrared and Raman spectra of D 4-ortho, meta and para fluorochloro and fluorobromo benzenes are presented and assignments are given. Some of the bands of H 4- p-fluorochloro benzene assigned earlier as fundamentals are shown to be due to impurities and alternate assignments are given. The observed frequencies of the H 4 and D 4 molecules are combined in a normal coordinate analysis to obtain a 33-parameter modified valence force field, for the in-plane vibrations, with an average difference of ±0.8% between observed and calculated frequencies. The normal coordinate analysis shows that many of the previous assignments of the ring modes ν 1, ν 6, and ν 12 for disubstituted benzenes are not very reliablie. Revised assignments with good correlation with the corresponding benzene modes are given.
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