Photochemical preparation and reactivity of platinum(II) complexes with oxygen-donor ligands. Description and synthesis of di-µ-chloro-dichlorobis(substituted pyridine)diplatinum(II)

Abstract

The complexes [PtCl₂YL](Y = substituted pyridine, L = oxygen-donor ligand) have been obtained by irradiation of [PtCl₂Y(CH₂CH₂)] in the appropriate solvent. Substitutions of the oxygenated ligands by dimethyl sulphide, ethylene, and acetonitrile have been studied. At room temperature and in the absence of external ligands, loss of the oxygen-donor ligand is observed and dichloro-bridged diplatinum complexes [(PtCl₂Y)₂] are formed with cis and trans configurations. The cis–trans proportion of the diplatinum complexes can be shifted by u.v. irradiation and compounds with cis configurations have been isolated for the first time by this process.