Abstract

Acetone nicotinoylhydrazone (ANH) and acetone isonicotinoylhydrazone (AINH) and their mixed ligand complexes with dioxouranium; [UO2(ANH¬¬¬¬)2(NO3)2] xH2O (1), [UO2(AINH)2(NO3)2] xH2O (2), [UO2(ANH¬¬)2 (CH3COO)2]xH2O (3) and [UO2(AINH)2(CH3COO)2]xH2O (4) were synthesized. The compounds were characterized by melting point, solubility, conductivity measurement, infrared, elemental analysis and electronic spectral studies. The Schiff’s base ligands act as bidentate donors using the carbonyl O and the azomethine N as binding sites to form stable metal chelates. The complexes adopt octahedral geometry with two ligands coordinated to the metal ion, while the fifth and sixth positions are occupied by NO for the nitrate complexes and CH3COO- for the acetato complexes. The acetate and nitrate coligands were found to coordinate via unidentate mode. The compounds have moderate melting points and are nonelectrolytes in solution, relatively stable and insoluble in common solvents except in dimethyl sulfoxide (DMSO) and dimethylformamide (DMF). Electronic spectra revealed that the complexes exhibited intraligand and charge transfer transitions accounting for the complexes