Abstract
Stability data for complexes of yl(VI) ions MO 2 2+ (M = U, Np, and Pu) with monocarboxylic ligands L are reported and discussed (L = CH 3CO 2 −, C 2H 5CO 2 −, and CH 2ClCH 2CO 2 −). Stability constants refer to the formation equilibria of complexes in aqueous NaClO 4 solution at 20° and 1 M ionic strenght. In the range of ligand concentrations examined, complexes are formed in which the highest average ligand number, n̄ is three. The stability order of complexes of the various ligands examined is UO 2 2+>NpO 2 2+>PuO 2 2+. The stabilities of complexes of a given MO 2 2+ ion increase with increasing ligand basicity, which suggests a strong hard character for these oxycations.
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