Journal of Emerging Trends in Engineering and Applied Sciences: Research Areas

Article Title: Synthesis and Characterization of P-Nitrobenzoylpyrazolone-5 and Its Complexes of Manganese (II), Iron (III), Rhodium (III), Tungsten (VI) and Uranium (VI)
by Arinze, J.C., Daniel, N.E. and Ogwuegbu, M.O.C

Abstract:
The present study is aimed at the preparation of 1-phenyl-3-methyl-4-(p-nitrobenzoyl)-5-pyrazolone (HNPZ) by the benzoylation of 1-phenyl-3-methyl-5-pyrazolone (HPMP) with p-nitrobenzoyl chloride, the preparation of metal complexes of HNPZ with manganese (II), iron (III), rhodium (III), tungsten (VI) and uranium (VI) ions, the investigation of the modes of interaction between the metals and the ligand (HNPZ) in aqueous media using spectroscopic methods, the investigation of the structures and compositions of the metal complexes using elemental analysis, UV-visible and infrared spectroscopies. The study suggests that the ligand and metal ions formed neutral complexes of the general formular M(NPZ)nX (M = metal ion, NPZ = ligand anion, X = H2O Molecule, n = the number of ligand molecules that complexed to M). Mn (II) formed dihydrate bischelate, Mn(NPZ)2?2H2O; Fe (III) and Rh (III) formed anhydrous trischelates, M(NPZ)3, while W (VI) and U (VI) formed dioxo aquobischelates of the type, MO2(NPZ)2H2O. The study also showed the formation of neutral octahedral complexes of Mn (II), Fe (III) and Rh (III), and pentagonal bipyramidal complexes of W (VI) and U (VI) with the HNPZ anion

Keywords: extraction, solvent, complexes, pyrazolones, ligands, metal ions

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