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

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 77; no. 1; pp. 297 - 303
• Main Authors: El-Asmy, Ahmed A., El-Gammal, O.A., Radwan, H.A., Ghazy, S.E.
• Format: Journal Article
• Language: English
• Published: England Elsevier B.V 15.09.2010
• Subjects: Animals; Benzyl Compounds - chemistry; Benzyl Compounds - pharmacology; Cattle; Color; Cr 3+, VO 2+, ZrO 2+, HfO 2+, UO 22+ and MoO 22+ complexes; DNA - drug effects; Electron Spin Resonance Spectroscopy; Electrons; Flotation; Hydrazones - chemistry; Hydrazones - pharmacology; Ions; Magnetics; Models, Molecular; Oxalyl bis(3,4-dihydroxybenzylidene) hydrazone; Spectra; Spectrophotometry, Infrared; Temperature; Thermogravimetry; Zirconium - chemistry; Flotation; Spectra; Cr 3+, VO 2+, ZrO 2+, HfO 2+, UO 2 2+ and MoO 2 2+ complexes; Oxalyl bis(3,4-dihydroxybenzylidene) hydrazone
• ISSN: 1386-1425; 1873-3557
• DOI: 10.1016/j.saa.2010.05.026

The molecular modeling and parameters have been calculated to confirm the geometry of oxalyl bis(3,4-dihydroxybenzylidene) hydrazone, H 6L. The metal complexes of Cr 3+, VO 2+, ZrO 2+, HfO 2+, UO 2 2+ and MoO 2 2+ with H 6L 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(H 4L)(H 2O) 3Cl]·H 2O, [VO(H 4L)(H 2O) 2], [Hf(H 4L)(H 2O)]·H 2O [UO 2(H 4L)(H 2O) 2]·2H 2O [MoO 2(H 4L)] and [(ZrO) 2(H 2L)-(C 2H 5OH) 2]. The ligand behaves as a dibasic bidentate in all complexes except ZrO 2+ which acts as a tetrabasic tetradentate with the two ZrO 2+ ions. An octahedral geometry was proposed for the Cr 3+, HfO 2+, MoO 2 2+and UO 2 2+ complexes and square pyramid for VO 2+. The Cr 3+ is necessary to degrade the DNA of eukaryotic subject completely; the other complexes have little effect. H 6L was found suitable as a new reagent for the separation and preconcentration of ZrO 2+ ions from different water samples using flotation technique with satisfactory results.