Infrared Spectra of Negative Ions of Amides

Abstract

Abstract The anionic derivatives of a series aliphatic, arylaliphatic and aromatic compounds containing amide group were investigated by means of infrared spectroscopy. The stretching vibration frequencies of the amide C=O, the ketone C=O and the N-C(Ph) in the N-anions of the studied compounds were assigncd: the amide C=O shifts 76-180 cm−1 downward depending on the substituents; the band intensity increases 2.5-3 times. It was found an excellent correlation between the carbonyl stretching vibration frequencies of the studied N-anions with the Hamrnett CJ constants of the substituents.