Nuclear magnetic resonance study of inversion at sulphur and selenium atoms in complexes of palladium(II) and platinum(II). Part 1. Complexes of bis(trimethylsilylmethyl) sulphide and selenide

Abstract

Total n.m.r. band-shape fitting methods have yielded some precise data for the energy barriers of inversion at S and Se when these atoms are bonded to Pd^II and Pt^II in the complexes [MCl₂{X(CH ₂SiMe₃)₂}₂](M = Pd^II or Pt^II, X = S or Se). The S barrier energies are in the range 51–56 kJ mol^–1 and the coresponding barriers at Se are in the range 60–66 kJ mol^–1. The somewhat higher energies in complexes of Pt^II compared to Pd^II reflect the relative strengths of the Pd–S and Pt–S bonds.