Synthesis and characterization of new dimethylplatinum(IV) complexes with o-(diphenylphosphino)thioanisole and its chalcogenide derivatives as ligands. Crystal structure of trans-[Me 2PtBr 2{ o-Ph 2P(S)C 6H 4SMeS,S′}

Abstract

The compound o-(diphenylphosphino)thioanisole can be oxidized by S or Se in benzene leading to the derivatives Ph 2P(E)C 6H 4SMe [EPSMe; E=S ( 1), Se ( 2)]. These compounds act as bidentate chelate ligands in reactions with the platinum(IV) complex [Me 2PtBr 2] n to form trans and cis isomers of the general formula [Me 2PtBr 2(L 2)] [L 2=SPSMe ( 3, 4); SePSMe ( 5, 6)]. The reaction of the complex [Me 2PtBr 2] n with the starting ligand Ph 2PC 6H 4SMe (PSMe) led to a reductive elimination affording the neutral complex [PtBr 2(PSMe)] ( 7). The structure of the complex [Me 2PtBr 2{ o-Ph 2P(S)C 6H 4SMe}] was established by X-ray crystallography. The platinum atom has a distorted octahedral coordination and it is bonded to two methyl carbons, two bromide atoms and two sulfur atoms of the ( o-diphenylphosphinesulfide)thioanisole bidentate ligand.