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

Abstract

The ¹⁹⁵Pt chemical shifts (δ_pt) 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 δ_pt 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.