Vibrational spectra of crystalline organic sulphides: dimethyl sulphide and diethyl sulphide

Abstract

The vibrational spectra of crystalline dimethyl sulphide and diethyl sulphide have been measured at 77 K. The comparison with the liquid-state spectra has provided the correlation between the normal motions of the free molecules and those of the molecules in the Bravais unit.All Davydov components in the solid-state spectra have been assigned with the aid of polarized infrared radiation, and the analysis of the unit-cell symmetry of both molecules has been derived.