The crystal and molecular structure of two pyridium propylide complexes of platinum(II) and platinum(IV)

Single crystal structure analyses have been completed of dichloro(pydridinum propylide)pyridineplatinum(II) and tetrachloro(pyridinium propylide)pyridine-platinum(IV). C₁₃H₁₆Cl₂N₂Pt forms monoclinic crystals from benzene and an X-ray analysis has been based on 1560 independent reflexions, intensities of which were measured on a Pailread diffractometer; least-quarters analysis of atomic parameters of the two independent molecules in the unit cell has converged R = 0.097. C₃H₁₆Cl₄N₂Pt·CHCl₃ also forms monoclinic crystals and an analysis is based on 1913 reflecxions (R = 0.089), intensities of which were visually estimated from Weissenberg and precession photographs. The mean metal-ligand band lenghts are 2.32 » (Pt-Cl), 2.10 » (Pt-N), 2.01 » (Pt-C) and are independent of the formal oxidations state of the metal. The formulation of the complexes as containing co-ordinated ylides is based on both NMR and stereochemical data.