A FUNDAMENTAL STUDY OF THE INFRARED SPECTRA OF SUBSTITUTED AROMATIC COMPOUNDS

Attempts were made to correlate the intensities of far IR absorption bands of momo- and disubstituted benzenes with physical properties of the molecules or of their substituents. I NTENSITIES WERE MEASURED FOR MONOSUBSTITUTED BENZENES HAVING THESE SUBSTITUENTS -F, -Cl, -Br, -I, -CN, CH3, -CF3, -CCl3, -NO2, and -OCH3. Some second-degree correlations but no useful simple correlation were found. Correlations were sought for the intensity of symmetrical 1,4-disubstituted benzenes, a vibration probably not as likely to mix with other modes of its symmetry species. However, the intensities did not correlate well. Complete IR of all 38 compounds studied are catalogued from 4000 to 265 reciprocal cm. Author