Raman and infra-red spectra of amines

V. Summary

The Raman and infra-red spectra of toluidines andpara-amino-acetophenone have been recorded and the N-H stretching and bending frequencies of these amines have been assigned. The effect of solvent on the N-H stretching and deformation frequencies of the amines is investigated and their variation in solutions of pyridine is accounted for as due to the N-H ... N bonding. The empirical formula proposed by Bellamy for the N-H stretching frequencies of amines has been used for the amines under investigation. The formula is obeyed for the N-H stretching frequencies of amines and in solutions of carbon tetrachloride, chloroform or dioxane, but it breaks down for the same frequencies in pyridine. These results are explained.