Vibrational spectra of some chloro- and methylchloro-species of cadmium, indium, tin, antimony, tellurium, and iodine

Abstract

Vibrational spectra of the following species are reported: SbCl₃(gas), SnCl₄(gas), (NH₄)₂SbCl₅, MeTeCl₃, Me₂TeCl₂, Me₂SbCl₃, MeTeCl₄^–, Me₂SbCl₄^–, Me₃SnCl₂^–, Me₂SnCl₃^–, MeSnCl₄^–, MeSnCl₅^2–, and SbCl₆^3–. In the case of Me₂SnCl₄^– and Me₃SnCl₂^– deuteriation studies are also given. The values of the frequencies of the most intense ‘metal–chlorine stretching mode’ in the Raman effect are compared with those of related compounds. It is suggested that in the six-co-ordinated species LMCl₅^n–(where L = a lone pair or methyl group) the M–Cl bond trans to a lone pair or methyl group will be short relative to those in the planar MCl₄ residue. Similarly in five-co-ordinated trigonal bipyramidal species LMCl₄^n– and L₂MCl₃^n– it is suggested that M–Cl bonds in the same equatorial plane as a lone pair or methyl group will be shortened relative to those in the linear MCl₂ residue. On the basis of this discussion suggestions are made about the acceptor properties and shapes of several species.