Synthesis and characterization of new dimethylplatinum(IV) complexes with o-(diphenylphosphino)thioanisole and its chalcogenide derivatives as ligands. Crystal structure of trans-[Me2PtBr2{o-Ph2P(S)C6H4SMeS,S′}]

Abstract The compound o -(diphenylphosphino)thioanisole can be oxidized by S or Se in benzene leading to the derivatives Ph 2 P(E)C 6 H 4 SMe [EPSMe; E=S ( 1 ), Se ( 2 )]. These compounds act as bidentate chelate ligands in reactions with the platinum(IV) complex [Me 2 PtBr 2 ] n to form trans and cis isomers of the general formula [Me 2 PtBr 2 (L 2 )] [L 2 =SPSMe ( 3 , 4 ); SePSMe ( 5 , 6 )]. The reaction of the complex [Me 2 PtBr 2 ] n with the starting ligand Ph 2 PC 6 H 4 SMe (PSMe) led to a reductive elimination affording the neutral complex [PtBr 2 (PSMe)] ( 7 ). The structure of the complex [Me 2 PtBr 2 { o -Ph 2 P(S)C 6 H 4 SMe}] 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.