Uranium(VI) Complexes of Some Schiff Bases Derived from Hydroxyaromatic Aldehyde and Ketone

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Abstract
Stable uranyl(II) complexes of some Schiff bases derived from 1,2-diaminoethane with bis-salicylaldehyde (H2L1) and/or bis-o-hydroxy-acetophenone (H2L2) as well as 2-aminophenol with salicylaldehyde (H2L3) and o-hydroxyacetophenone (H2L4) have been prepared. The complexes have been characterized by elemental analysis, spectral (UV-Visible, IR and 1NMR) studies as well as magnetic measurements. IR specral data suggest that the neutral molecules (H2L3 and H2L4) are tridentate ligands coordinating to the central metal ions. The anions of H2L1 and H2L2 are tetradentate giving seven-coordination in the case of uranyl acetate and six-coordination in the nitrate. The labile EtOH molecule in UO2L1.C2H5OH is equatorially bonded to the uranium ion and its hydrogen is bonded to the axial oxygen of the uranyl moiety through hydrogen bonding and is easily substituted by polar solvents. The fU-O (mdyn Å) and the length rU-O(Å) of the UO bond are calculated from the IR data.

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