Synthesis, characterisation and study of the first luminescent platinum(II) compound with a [C,N,S]- terdentate ligand.: X-ray crystal structure Of [Pt{C6H4-CH=N-(C6H4-2-SMe)}Cl]

The study of the reactions of the thioimine C6H5-CH=N-(C6H4-2-SMe) with cis-[PtCl2DMSO)(2)] or cis-[PtCl2(PhCN)(2)] is reported. The results obtained from the reactions of cis-[PtCl2(DMSO)(2)] with the Schiff base suggest that this platinum(II) complex induces the hydrolyses of the imine. In contrast to these findings, the treatment of equimolar amounts of C6H5-CH=N-(C6H4-2- SMe) and cis-[PtCl2(PhCN)(2)] under refluxing toluene lead to the cycloplatinated complex: [Pt{C6H4-CH=N-(C6H4-2-SMe)}Cl], which is luminescent in solution at 298 K. The X-ray crystal structure of this compound reveals that the ligand acts as a [C(sp(2)),N,S](-) ligand and has the E (anti-) conformation. The reaction of the cycloplatinated compound [Pt{C6H4-CH=N-(C6H4-2-SMe)}Cl] with PPh3 is also reported. This process produces the cleavage of the Pt-S bond and the formation of [Pt{C6H4-CH=N-(C6H4-2-SMe) Cl(PPh3)] in which the ligand acts as a monoanionic (C,N)(-) bidentate group. (C) 2003 Elsevier Science B.V. All rights reserved.