Vibrational spectra and assignments for 2-chloro and 2-bromo derivatives of thiophene, selenophene and tellurophene

Abstract

The infrared spectra of 2-chloro-, 2-bromo-thiophene, -selenophene and -tellurophene as liquids have been investigated from 4000 to 300 cm −1. The laser Raman spectra of these liquids have also been recorded and depolarization values have been measured. An assignment of the 21 fundamental vibrations is proposed, based on group frequency correlations, Raman polarization data and comparison with the spectra of parent molecules.