Abstract
Stability constants, enthalpies and entropies in the formation of uranyl(VI) and thorium(IV) with aspartic acid have been determined at 25.0°C in a 1.0 mol dm −3 aqueous solution of sodium perchlorate by means of the potentiometric and calorimetric techniques. Because of precipitation of solid compounds, only two complexes of 1 : 1 and 1 : 2 stoichiometry were observed in the uranyl(VI)—asparate system and only one complex of 1 : 1 stoichiometry in the thorium(IV)—aspartate system. Comparison of values of stability constants and enthalpy and entropy changes with the corresponding values of some mono- and di-carboxylate ligands suggests that the binding of both metal ions involves one carboxylate group only, the one furthest from the positive amino group.
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