VERSATILE LIGAND BEHAVIOR OF PHENYL 2-PYRIDYL KETONE BENZOYLHYDRAZONEIN PALLADIUM(II) COMPLEXES

A series of monometallic palladium(II) complexes with phenyl 2-pyridyl ketone benzoylhydrazone (H(2)L) has been synthesized and characterize d. The spectroscopic and diffractometric data have revealed a versatil e ligand behaviour which mainly depends on the the palladium salt reag ent. From the reaction of palladium acetate a cyclopalladated complex, [PdL(MeCN)], was isolated, the exact nature of which has been establi shed by X-ray diffraction. With palladium chloride two complexes, [Pd( HL)(2)] and [Pd(HL)Cl], were obtained with the monodeprotonated hydraz one behaving as an N,N-bidentate and N,N,O-terdentate ligand, respecti vely.