Synthesis, characterization and physicochemical properties of copper(II) complexes containing salicylaldehyde semicarbazone

Abstract

Copper(II) complexes containing a series of salicylaldehyde semicarbazone ligands have been prepared and characterized by a range of physicochemical techniques. The X-ray structure of [Cu(HBnz 2)Cl]·H 2O ( 5) (where HBnz 2 is salicylaldehyde- N, N-dibenzyl semicarbazone) shows the complex is monomeric and the copper atom is four coordinated in a distorted square planar geometry. The ligand chelates the copper in a tridentate fashion through the imine N, carbonyl O and phenolato O with the fourth position being occupied by coordinated Cl. The compound [Cu(Ph 2)·H 2O] ( 4) (where Ph 2 is salicylaldehyde- N, N-diphenyl semicarbazone) is also formulated as a monomer whereas all other complexes are assumed to have a side-by-side dimeric arrangement of the metal chelating with the phenolate bridging the Cu(II) centres.