RAMAN SPECTRA OF METHYL AND EYTHYL ESTERS OF BENZOIC ACID

Abstract

The Raman spectra of methyl and ethyl benzoates have been recorded in the liquid state at room temperature and the frequency shifts are compared with those of earlier investigations. A new line at 140 cm.-1 in methyl benzoate and three new lines at 377, 432 and 862 cm.-1 in ethyl benzoate are reported. The lines 1720, 1110 and 670 cm.-1 are assigned 11 as the characteristic frequencies of the -C-0- group. The weak line at 850 cm. in methyl benzoate and the lines at 850 and 862 cm.-1 in ethyl benzoate are ascribed to a mode of oscillation of the C-O-C chain and the frequencies below 200 cm.--1 to intermolecular vibration in associated molecules.