Raman spectra of intermolecular compounds between antimony trichloride and methyl-group substituted benzenes (2:1)

Abstract

Raman spectra of intermolecular complexes between antimony trichloride and methyl-group substituted benzene derivatives were recorded to investigate the complexation-induced frequency shifts of vibrations belonging to the aromatic complex partners. The shifts are discussed according to the reduction of electronic charge on the ring framework of the electronic donator molecules and higher amounts of vibrational coupling. Vibrational coupling appears between CC stretching vibrations and internal modes of the substituted methyl groups and between CH stretching vibrations of the ring and the methyl groups. The influence of the charge reduction is directly related to the affections of the CH stretching vibrations and CH out-of-plane vibrations of the ring, as well as the CC stretching vibrations with tangential amplitude directions.