Ni(II), Pd(II), Cu(II) and Zn(II) complexes with N-(2-pyridyl)carbonylantline (L), syntheses and X-ray crystal structures of [Cu(L)2(H2O)2](NO3)2, [Cu(L)2(H2O)2](ClO4)2 and [Zn(L)2(H2O)2](ClO4)2

Reaction of the N-(2-pyridyl)carbonylaniline ligand (L) with Cu(NO3)(2), Cu(ClO4)(2), Zn(ClO4)(2), Ni(NO3)(2) and PdCl2 gives complexes with stoichiometry [Cu(L)(2)(H2O)(2)](NO3)(2), [Cu(L)(2)(H2O)(2)(ClO4)(2), [Zn(L)(2)(H2O)(2)] (ClO4)(2), [Ni(L)(2)(H2O)Cl](NO3) and PdLCl2. The new complexes were characterized by elemental analyses and infrared spectra. The crystal structures of [Cu(L)(2)(H2O)(2)](NO3)(2), [Cu(L)(2)(H2O)(2)](ClO4)(2), and [Zn(L)(2)(H2O)(2)](ClO4)(2) were determined by X-ray crystallography. The cation complexes [M(L)(2)(H2O)(2)] contain copper(II) and zinc(II) with distorted octahedral geometry with two N-(2-pyridyl)carbonylaniline (L) ligands occupying the equatorial sites. The hexa-coordinated metal atoms are bonded to two pyridinic nitrogens, two carbonyl oxygens and two water molecules occupying the axial sites. Both the coordinated water molecules and uncoordinated amide NH groups of the N-(2-pyridyl)carbonylaniline (L) ligands are involved in hydrogen bonding, resulting in infinite hydrogen-bonded chains running in one and two-dimensions.