Cation-cation complexes of oxidized actinide ions were first reported fifty years ago by Sullivan and coworkers. Though the first noted complex was between NpO2+ and UO22+, similar species have been reported involving NpO2+, UO2+ and AmO2+ and a variety of high valent transition metal, main group and actinide species. In these complexes AnO2+ behaves as a ligand, probably bonding via the 'yl' oxygen to form a coordination complex with AnO22+ or other high charge density cations. From a practical applications perspective, cation-cation complexes may have significance when processing used nuclear fuel on an industrial scale, particularly species involving NpO2+. In this report, spectrophotometric and electrochemical methods have been used to deduce information about the thermodynamics of the reactions AnO2+ + AnO22+ ? [AnO2�AnO2]3+ and AnO2+ + M3+ ? [AnO2�M]4+. The influences of water activity, non-aqueous solvents, complexing versus non-complexing anions, and temperature on the stability of these complexes are discussed.

Fundamental studies of AnO<sub>2</sub><sup>+ </sup>cation-cation complexes in aqueous and non-aqueous media

243rd National Meeting (2012)

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Fundamental studies of AnO2+ cation-cation complexes in aqueous and non-aqueous media

Fundamental studies of AnO₂⁺cation-cation complexes in aqueous and non-aqueous media