Journal
DALTON TRANSACTIONS
Volume 42, Issue 7, Pages 2636-2642Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2dt31485a
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Funding
- Department of Energy/Nuclear Energy Fuel Cycle R&D Thermodynamics and Kinetics program
- U.S. Department of Energy [DE-AC09-8SR22470, DE-AC07-05ID14517]
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Through Density Function Theory (DFT) calculations, we set out to understand the structures and stabilities of the aqueous phase complexes [M-III(DTPA)-H2O](2-) (M = Nd, Am) as well as the changes in Gibbs free energy for complexation in the gas phase and aqueous solution. All bonding analyses suggest that the preference of the DTPA(5-) ligand for Am over Nd is mainly due to electrostatic and covalent interactions from the oxygen atoms with the nitrogen chelates providing an additional, yet small, covalent interaction. These results question the exclusive use of hard and soft acids and bases (HSAB) concepts for the design of extracting reagents and suggest that hard-soft interactions may play more of a role in the separations process than previously thought.
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