CRYSTAL-STRUCTURE OF CATIONIC SQUARE-PLANAR PLATINUM(II) COMPLEXES CONTAINING THE TRIDENTATE CHELATE LIGAND 2,6-BIS(METHYLTHIOMETHYL)PYRIDINE

The crystal structures of four platinum(II) complex cations containing the organic ligand 2,6-bis(methylthiomethyl)pyridine (SNS), [Pt(SNS)C l]+ (1), [Pt(SNS) (SCN)]+ (2), [Pt(SNS)Br]+ (3) and [Pt(SNS)(Py)]2+ (4 ) have been determined by X-ray diffraction. In all complexes SNS beha ves as a tridentate neutral ligand with the two sulphur atoms in trans positions to each other. The fourth coordination position, trans to t he nitrogen atom of SNS, is occupied either by a monodentate chloride, sulphur-bonded thiocyanate, bromide or nitrogen of a pyridine molecul e, respectively, in a square planar arrangement. No Pt-Pt interactions in the linear chain are present. Pt-N(pyridine) bond distances are re lated to the charge of the complexes.