Abstract
Complexes formed by actinides with carboxylic acids, polycarboxylic acids, and aminopolycarboxylic acids play a central role in both the basic and the process chemistry of the actinides. Recent studies of f element complexes with phosphonic acid ligands indicate that new ligands incorporating doubly ionizable phosphonate groups (PO 3H 2) have many properties which are unique chemically, and promise more efficient separation processes for waste clean-up and environmental restoration. Simple diphosphonate ligands form much stronger complexes than isostructural carboxylates, often exhibiting higher solubility as well. In this manuscript recent studies of the thermodynamics and kinetics of f element complexation by 1,1- and 1,2-diphosphonic acid ligands are described.
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