Trans platinum(II) complexes with pyridine and substituted pyridines

Abstract

Complexes of the type trans-PtL 2X 2 (L = pyridine, 2-picoline, 3-picoline, 4-picoline and 3,5-lutidine; X = Cl, Br, NCS) have been sythesized by nucleophilic displacement of two ligands from the tetrakis ion [Pt(L) 4] 2+ by the appropriate anion X- either in the solid state or in aqueous solution. Thermal degradation of the solid tetrakis complexes [Pt(L) 4]X 2 (L = 4-picoline, 3,5-lutidine, X = Cl, Br, NCS) and [Pt(3-picoline) 4]X 2(X = Cl, Br) led to the appropriate trans-complex PtL 2X 2. In the other cases nucleophilic displacement by the appropriate anion occured directly in aqueous solution to produce the trans bis-ligand complex without the formation of the intermediate tetrakis ligand complex. The trans-complexes are characterised by vibrational spectroscopy and elemental analysis.