Intensities of Some Characteristic Infrared Bands of Ketones and Esters

Abstract

Integrated intensities of the 2900, 1720, 1460, 1370, and 1200 cm−1 bands are reported for four ketones and five esters, and gratingspectra are shown for the 2780–3060 and 1300–1500 cm−1spectral regions. CH3 and CH2 structural group integrated intensities are derived from the data which are adequate for predicting the integrated molecular intensities of the bands in the 2900, 1460, and 1370 cm−1spectral regions. The data show that the carbonyl and ester structural groups reduce the intensities of the stretching modes and increase the intensities of the deformation modes of adjacent CH3 and CH2 groups. A number of empirical correlations are pointed out between positions of absorption maxima in the 2900, 1460, and 1370 cm−1 regions and the internal molecular environment of CH3 and CH2 groups.