Synthesis and spectral properties of dioxouranium (VI) complexes of N-isonicotinamidio-p-anisalaldimine and N-isonicotinamido-p-dimethylamino benzalaldimine

In the present work, the ligational behaviour of N-isonicotinamido-p-anisaladimine (INH-ANSL) and N-isonicotinamido-p-dimethylaminobenzalaldimine (INH-PDAB) toward dioxouranium(VI) salts were studied. The isolated complexes have the general composition UO2X2.nL (X=Br-, I-, NCS-, NO3- or CH3COO-, n = 2, X = ClO4-, n = 3 and L = INH-ANSL or INH-PDAB). All these complexes were characterized by infrared, conductance, magnetic moment, molecular weight data and elemental analyses. In these complexes both the ligands behave as neutral bidentate ligand coordinating through amido-oxygen and azomethinic-nitrogen atoms. The electrical conductance indicates that except UO2(ClO4)2 complexes all the complexes are non-electrolytes, while UO2(ClO4)2.3L are 1:2 electrolytes. The probable coordination number of U(VI) is either 8 or 10 depending on the nature of anions. Thermal properties of the complexes are also discussed. (author)