The platinum-195 chemical shift in some platinum(0) and platinum(II) complexes and its relationship to their structure

Abstract

The 195Pt chemical shifts (δpt) are reported for complexes [PtL4]0[L = PMe2Ph and P(OMe)3], [PtX3L]–, cis and trans-[PtX2L2], and [PtXL3]+(where L may be PMe3, AsMe3, SbMe3, SMe2, SeMe2 or TeMe2, and X may be Cl, Br, or I), [PtX3L]–(where L may be NMe3, SOMe2, or C2H4 and X may be Cl or Br), and cis-[PtX2(SOMe2)2](where X may be Cl or Br). The chemical shifts for complexes involving more than one type of halide are used to analyse the effect of halide on δpt in different situations. The platinum chemical shift is shown to be relatively insensitive to the substituents on the donor atoms and to be useful in the identification of the nature of platinum complexes. The results for [PtX3L]– can be reconciled with the theoretical predictions if the covalency of the metal–ligand bond is taken into account.