A comparison of the fundamental vibrations of the anions: O-methylmonothiocarbonate and O-methyldithiocarbonate

Abstract

Twelve of the bands observed in the infrared and Raman spectra of the anions, O-methylmonothiocarbonate and 0-methyldithiocarbonate, have been assigned to in-plane vibrations, on the basis of normal coordinate analyses. It is shown that, because of the large number of parameters, vibrational studies of this type cannot be used to determine, unambiguously, the relative contribution of the canonical forms -S(-O)C=O+-CH₃ and ^2-S₂C=0⁺-CH₃ to the structures of the corresponding anions.