Infrared Spectra and the Structures of Xanthates and Dixanthogens

The infrared spectra of representative dialkyl dixanthogens and a few xanthates have been examined. All these compounds have two strong absorption bands in the regions 1140–1265 and 1010–1080 cm−1. On the basis of the shift of the bands with the changes in the substituents in the xanthic acid, the former band is assigned to the C=S group, while the latter to the CO group. Except in the ionic compounds, the canonical structure [Formula: see text] contributes very little to the structures of dixanthogens and covalent metal complexes.