Molybdenum(VI), Uranium(VI) and Vanadium(V) Complexes of 4-Acylbis(L-Phenyl-3-Methylpyrazolone-5): Synthesis and Spectroscopic Characterization

• Published in: Synthesis and reactivity in inorganic and metal-organic chemistry 2000-03, Vol.30 (3), p.433-443
• Main Authors: Uzoukwu, B. A., Gloeb, K., Adiukwu, P. U.
• Format: Article
• Language: English
• ISSN: 0094-5714; 1532-2440
• DOI: 10.1080/00945710009351772

The synthesis and characterization of metal complexes of 4-adipoyl and 4-sebacoyl derivatives of bis(l-phenyl-3-methylpyrazolone-5) with Mo(VI), U(VI) and V(V) are reported. Analytical and spectroscopic data show that the complexes are neutral and conform to a general empirical formula MO 2 (L) a (HL) b -xH 2 O where M is the metal; L is 4-acylbis(l-phenyl-3-methyl-pyrazolone-5) dianion; a = 0 or 1; b = 0 or 1 and x = 0, 1/2 or 1. The molybdenum complex of the 4-adipoyl derivative was, however, found to conform to an empirical formula of (MO 2 ) 2 (L)(OH)(OCH 2 CH 3 ) suggesting that two moles of Mo(VI) interacted with one mole of the ligand to form a neutral complex. IR spectral analysis showed that O˭V˭O and O˭Mo˭O species existed as the cis-form in the V(V) and Mo(VI) complexes respectively. The UV-visible, IR and NMR spectral data of the complexes were reported.