Ligational, analytical and biological applications on oxalyl bis(3,4-dihydroxybenzylidene) hydrazone

The molecular modeling and parameters have been calculated to confirm the geometry of oxalyl bis(3,4-dihydroxybenzylidene) hydrazone, H6L. The metal complexes of Cr3+, VO2+, ZrO2+, HfO2+, UO22+ and MoO22+ with H6L have been prepared and characterized by partial elemental analysis, spectral studies (electronic; IR), thermal analysis and magnetic measurements. The data suggest the formation of polymer complexes with a unit [Cr(H4L)(H2O)3Cl]·H2O, [VO(H4L)(H2O)2], [Hf(H4L)(H2O)]·H2O [UO2(H4L)(H2O)2]·2H2O [MoO2(H4L)] and [(ZrO)2(H2L)-(C2H5OH)2]. The ligand behaves as a dibasic bidentate in all complexes except ZrO2+ which acts as a tetrabasic tetradentate with the two ZrO2+ ions. An octahedral geometry was proposed for the Cr3+, HfO2+, MoO22+and UO22+ complexes and square pyramid for VO2+. The Cr3+ is necessary to degrade the DNA of eukaryotic subject completely; the other complexes have little effect. H6L was found suitable as a new reagent for the separation and preconcentration of ZrO2+ ions from different water samples using flotation technique with satisfactory results.