Spectroscopic characterization of some copper(II) complexes

1-(Phenylazo)-2-naphthol (PANH) has three potential donor sites and thus it acts as a very good chelating agent. This ligand has been used for complexation with Cu-II ions to synthesize the complexes of general formula Cu(PAN)(2)Ln, where L = secondary ligands like pyridine, picoline, H2O and n = 0, 1 and 2. These complexes have been characterized by their elemenetal analysis, conductivity measurement, magnetic moment at room temperature, infrared spectra and electronic spectra. The ligand PANH is found to have coordinated through deprotonated phenolic oxygen and azonitrogen forming a six membered chelate with two conjugate pi-bonds in chelate ring. The magnetic moment values reveal the mononuclear nature of complexes while their electronic spectra reveal the geometry of the complexes. Cu(PAN)(2) complex is found square planar while Cu(PAN)(2)L and Cu(PAN)(2)L-2 are found square pyramidal and tetragonally distorted octachedral respectively.