(2,2',2''-terpyridine)platinum(II) complexes of phenylcyanamide and 1,4-dicyanamido-2,5-dimethylbenzene ligand

A series of square planar terpyridineplatinum(II) complexes of the phenylcyanamide ligand and its derivatives has been synthesized and characterized by IR, 1H NMR, UV-Visible spectroscopy, cyclic voltammetry and X-ray crystallography. The crystal structures of [(trpy)Pt(pcyd)](PF6) and [(trpy)Pt(2,4-Me 2-pcyd)](CF3SO3) show that the complexes are planar and the Pt-NCN bond is bent with angles in the range of 159 to 175°. Since the formation of pi-stacks in the crystal lattice requires planarity, the fact that the molecule is planar leads to the comparison with organic charge transfer salts that show pi-stacking and are highly conductive. It is suggested that the bending of the cyanamide group allows for mixing between the sigma* orbital of the metal and the pinb orbital of the ligand and causes the appearance of the ligand-to-metal charge transfer (LMCT) in the visible spectrum.;Two dinuclear terpyridineplatinum (II) complexes of derivatives of the 1,4-dicyanamidobenzene dianion (dicyd)2- were also synthesized and characterized by IR, 1H NMR, UV-Visible spectroscopy, and cyclic voltammetry.