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Theoretical studies of UO2(OH)(H2O)n+, UO2(OH)2(H2O)n, NpO2(OH)(H2O)n, and PuO2(OH)(H2O)n+ (n<=21) complexes in aqueous solution

J. Chem. Phys. 131, 164504 (2009); doi:10.1063/1.3244041

Published 27 October 2009

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Zhiji Cao1 and K. Balasubramanian1,2
1Department of Mathematics and Computer Science, California State University, East Bay, Hayward 94542, California, USA
2Chemistry and Material Science Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, USA and Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720, USA
Extensive ab initio calculations have been carried out to study equilibrium structures, vibrational frequencies, and the nature of chemical bonds of hydrated UO2(OH)+, UO2(OH)2, NpO2(OH), and PuO2(OH)+ complexes that contain up to 21 water molecules both in first and second hydration spheres in both aqueous solution and the gas phase. The structures have been further optimized by considering long-range solvent effects through a polarizable continuum dielectric model. The hydrolysis reaction Gibbs free energy of UO2(H2O)52+ is computed to be 8.11 kcal/mol at the MP2 level in good agreement with experiments. Our results reveal that it is necessary to include water molecules bound to the complex in the first hydration sphere for proper treatment of the hydrated complex and the dielectric cavity although water molecules in the second hydration sphere do not change the coordination complex. Structural reoptimization of the complex in a dielectric cavity seems inevitable to seek subtle structural variations in the solvent and to correlate with the observed spectra and thermodynamic properties in the aqueous environment. Our computations reveal dramatically different equilibrium structures in the gas phase and solution and also confirm the observed facile exchanges between the complex and bulk solvent. Complete active space multiconfiguration self-consistent field followed by multireference singles+doubles CI (MRSDCI) computations on smaller complexes confirm predominantly single-configurational nature of these species and the validity of B3LYP and MP2 techniques for these complexes in their ground states. ©2009 American Institute of Physics
History: Received 31 December 2008; accepted 17 September 2009; published 27 October 2009
Permalink: http://link.aip.org/link/?JCPSA6/131/164504/1
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KEYWORDS and PACS

Keywords
PACS
  • 31.15.am
    Ab initio relativistic configuration interaction (CI) and many-body perturbation calculations (atoms and molecules)
  • 31.15.xp
    Perturbation theory in atomic and molecular physics
  • 31.15.xr
    Self-consistent-field methods in atomic and molecular physics
  • 31.15.vq
    Electron correlation calculations for polyatomic molecules
  • 31.15.E-
    Density-functional theory (atoms and molecules)
  • 33.20.Tp
    Vibrational analysis (molecular spectra)
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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