Raman and infrared spectra of tetramethylcyclobutane‐1, 3‐dithione and the fully deuteriated derivative

Abstract

AbstractRaman and infrared spectra of tetramethylcyclobutane‐1, 3‐dithione (TMCBDT) and the fully deuteriated derivative (TMCBDT‐d12) have been recorded. A reasonably complete set of vibrational frequencies and assignments are presented for the two molecules. The symmetric CS stretching mode was observed at 1328 cm−1 for TMCBDT and at 1352 cm−1 for TMCBDT‐d12. The antisymmetric CS stretching mode occurs at lower frequencies of 1167 cm−1 for TMCBDT and 1158 cm−1 for the deuteriated molecule. This is consistent with previous observations for tetramethylcyclobutanedione. Ground‐state vibrational frequencies of several modes involved in progressions in the n→ π* electronic absorption spectra have been located.