Synthesis and molecular structures of palladium(II) metalated 2-phenylpyridine complexes [PdCl(pyC6H4)L] containing amino- or acetylamino-pyridine co-ligands

Cyclometalated palladium(II) complexes, [PdCl(pyC6H4)(L)], containing amino-pyridine, acetylamino-pyridine or diphosphine monoxide co-ligands (L) have been prepared and crystal structures of four examples are reported, each showing a distorted square planer geometry around palladium with the N-coordinated amino- or acetylamino-pyridine ligand lying almost perpendicular to the square-plane. Removal of the chloride from the diphosphine monoxide complexes upon addition of AgNO3 lead to the formation of [Pd(pyC6H4)(κ2-dppmO)][NO3] and [Pd(pyC6H4)(κ2-dppeO)][NO3] in which the ligands are believed to bind in a chelate fashion.