n+ . The most thoroughly investigated, best characterized and most stable oxometal cations are the dioxouranium(VI), dioxomolybdenum(VI) and oxovanadium(IV) ions. Complexes of the uranyl ion, UO 2 2+ , are of interest since they show four, five, six or seven-coordinate, pentagonal-bipyramidal geometry (Gatto et al., 2004). Due to the spectral properties (absorption and luminescence) and excited-state electron-transfer properties of the UO 2 2+ ion, dioxouranium(VI) complexes have possible applications in solar energy conversion systems (Signorni and Dockal, 1996).The Schiff base complexes with many transition metal ions, focused on complexes of the d-block elements, have attracted considerable interest because of their growing importance as model molecules for biological systems such as oxygen carriers. Dioxouranium(VI) complexes of some aroylhydrazines (benzoylhydrazine, salicyloylhydrazine, nicotinoylhydrazine) and their Schiff bases with acetone have been characterized where ligand acted as bidentate using NO-donor set (Chowdhury et al., 2008). The structure of the chelates of dioxouranium(VI), UO 2 2+ , of the bidentate Schiff base ligands derived from o-hydroxyaldehyde or