Vibrational spectra of thioanhydrides I. Succinic thioanhydride (original) (raw)

The infrared spectra of liquid and solid succinic thioanhydride are reported, together with the Raman spectrum of the liquid phase. Assignment of the planar vibrations is proposed on the basis of depolarization ratios and empirical correrations. This assignment is confirmed by a normal-coordinate calculation, using a valence force field partially transferred from succinic anhydride. The CO stretching vibrations are similar to those of ordinary anhydrides, the symmetric mode falling about 40 cm−1 above the antisymmetric.