Investigation of the vibrational spectra of PS 43−, CS 32−, CS 2Se 2−, CSSe 22−, CSe 32−, BCl 2Br and BClBr 2

Abstract

The unknown Raman spectra of CS 3 2− (in solution and of Tl 2CS 3O), BaCSe 3 and CS 2Se 2− (BaCS 2Se and partly in solution) have been measured. The Raman spectra allowed a reassignment of the earlier reported infrared spectrum of BaCS 2Se. Our assignment could be supported by the calculation of the frequencies of CS 2Se 2− with the Green's function method and also by transferring the valence force constants from CS 3 2− and CSe 3 2−. The calculated values of the fundamentals in BCl 2Br and BClBr 2 are in very good agreement with those of the experimentally determined ones. The earlier reported frequencies and assignment for CSSe 2 2− (Ba-salt) have been analysed in the same way. It could be demonstrated that the vibrational spectrum of BaCSSe 2 (the existence of which was based on the infrared spectrum only) cannot be completely correct. In addition, the unknown Raman spectrum of PS 4 3− in solution has been measured. Earlier reported assignments of the deformation frequencies are found to be different. The interpretation of the different frequencies of the deformation vibrations in the isoelectronic species PS 4 3− and SiCl 4 given earlier was used to study the same fact in the carbonate ions and boron halides.