Syntheses and characterization of zinc, cadmium, and mercury(II) complexes with N-(2-pyridyl)carbonylaniline (L), X-ray crystal structure of [Hg(L)(SCN)2]

The reaction of N-(2-pyridyl)carbonylaniline (L) with Zn(NO3)(2), CdCl2. and Hg(SCN)(2) gives the following complexes: [Zn(L)(2)](NO3)(2), [Cd(L)(2)Cl-2], and [Hg(L)(SCN)(2)]. The new complexes were characterized by elemental analyses and IR-, H-1-, C-13-NMR spectroscopy. The crystal structure of the [Hg(L)(SCN)(2)] was determined by single crystal X-ray analysis. The monomeric complex is built up of a Hg(SCN)(2) unit with one N-(2-pyridyl)carbonylaniline (L) ligand coordinated to the Hg atom via the ring pyridinic nitrogen atom and the carbonyl oxygen atom forming a five-membered chelate ring. The Hg atom has a distorted tetrahedral environment. There is pi-pi stacking interaction between the parallel aromatic rings belonging to adjacent chain as planar species in which the mean molecular planes are close to parallel and separated by a distance of similar to3.5 Angstrom, close to that of the planes in graphite. The coordinated N-(2-pyridyl)carbonylaniline (L) molecule is involved in hydrogen bonding acting as hydrogen-bond donors with S and N atoms from SCN- ligand as potential hydrogen-bond acceptors. There is a shortest intermolecular contacts between the S and N atoms. The hydrogen bonding and shortest intermolecular contacts between the S and N atoms yields infinite chains parallel to the crystallographic vector c. Each molecule is bonded to two neighbors.