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Reduction of uranyl(VI) by iron(II) in solutions: An ab initio study
KTH, Superseded Departments, Chemistry.
2003 (English)In: Journal of Physical Chemistry A, ISSN 1089-5639, E-ISSN 1520-5215, Vol. 107, no 4, 587-592 p.Article in journal (Refereed) Published
Abstract [en]

The reduction of uranyl U(VI) by Fe(II) in solution has been studied by quantum chemical methods, where the pH dependence of the reaction was simulated by using different numbers of coordinated hydroxide ions. The geometries for the binuclear U(VI)-Fe(II) precursor and the U(V)-Fe(III) successor complexes were optimized at the SCF level, and the reaction energies were calculated at the correlated level using the MP2 method. Effective core potentials were used throughout. Solvent effects were obtained by the polarizable continuum model. The accuracy of the solvent model was investigated for the binuclear complexes with two hydroxide bridges, and the accuracy of the MP2 method was assessed by comparing with CASPT2 and CCSD(T) calculations on the smallest complexes. The general trends in geometry and reaction energy are consistent with experiment.

Place, publisher, year, edition, pages
2003. Vol. 107, no 4, 587-592 p.
Keyword [en]
energy-adjusted pseudopotentials, aqueous-solution, cation complexes, uranium(vi), chemistry, actinides, exchange, fluoride, ions
Identifiers
URN: urn:nbn:se:kth:diva-22212DOI: 10.1021/jp026900eISI: 000180649000021OAI: oai:DiVA.org:kth-22212DiVA: diva2:340910
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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