High overtones investigation of non-equivalent CH bonds in pyridine and 2,6-lutidine by thermal lensing spectroscopy

Abstract

The 4 th and 5 th overtones of aryl and methyl CH stretching of pyridine and 2,6-lutidine in the liquid phase have been studied using thermal blooming effect. By comparison of the two liquids spectra it is possible to assign the different frequencies to aryl CH stretching affected by inductive and mesomeric effects of N atom in the ring. Evidences of conformationally non-equivalent CH bonds in the methyl groups in 2,6-lutidine are apparent.