Metal–sulphur vibrations. Part II. Dithiolate and dithiophosphate complexes and correlations for ν(M–S)

Abstract

I.r. spectra (70–4000 cm.^–1) of nickel complexes of the type [Ni(S₂C₂R₂)₂]^n–(R = H, CF₃, or CN) and of [M(S₂C₂(CN)₂)₂]^n–(M = Co, Cu, Zn, Pd, or Pt) are discussed. Vibrations containing a large (ν(M–S) contribution are found in the range 465–295 cm.^–1. Frequency and intensity variations are consistent with the molecular orbital description of the bonding.

For dithiophosphate complexes of three types of stereochemistry ν(M–S) is assigned in the region 330–220 cm.^–1; the variation is mainly due to the differing masses of the metal.

These results, together with other published work, lead to correlations for ν(M–S) for various ligands in the range 504–205 cm.^–1.