COORDINATION COMPOUNDS OF BUTANE-1,1/,4,4/- TETRACARBOXYLIC ACID TETRAKIS-(SALICYLALDEHYDENE HYDRAZIDE): THEIR PREPARATION, CHARACTERIZATION AND STRUCTURAL INVESTIGATION

There has been increasing interest in the use of hydrazides, hydrazones and their metal derivatives for a wide range of applications. Transition metal complexes have been prepared by chemical and electrochemical techniques with butane-1,1/,4,4/-tetracarboxylic acid tetrakis (salicylaldehydenehydrazide) (H8L). Electrochemical preparations using the metals as sacrificial anodes in non-aqueous acetone solution of the ligand were carried out and it has been found that the ligand reacts with bivalent metal ions to form polynuclear complexes. Elemental analyses, magnetic measurements, IR as well as electronic spectral studies have been used to elucidate the stoichiometry and to investigate the structures of the prepared complexes. It was found that the ligand has four hydrazone moieties and coordinates with the metal ions as ONO system forming tetranuclear complexes. Coordination is through the phenolic oxygen, the azomethine nitrogen and the carbonyl groups of the ligand.