Nuclear magnetic resonance study of pyramidal inversion and intramolecular rearrangements in complexes of trimethylplatinum(<scp>IV</scp>) halides with aliphatic and aromatic mixed thio–seleno-ethers

Abstract

Mixed chalcogen ligand complexes of trimethylplatinum(IV) halides of general type [PtXMe3(MeSRSeMe)][R =(CH2)2 or o-C6H4] have been prepared and the energy barriers associated with the pyramidal inversions of the individual chalcogen atoms measured by total band-shape dynamic n.m.r. methods. At elevated temperatures an intramolecular scrambling of all of the Pt-methyls occurs, associated with a fluxional movement which apparently effects a 180° rotation of the bidentate ligand.