Density functional theory study of uranium(VI) aquo chloro complexes in aqueous solution

Michael Buehl, Nicolas Sieffert, Volodymyr Golubnychiy, Georges Wipff

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

Mixed uranyl aquo chloro complexes of the type [UO2(H2O)(x)Cl-y](2-y) (y = 1, 2, 3, 4; x + y = 4, 5) have been optimized at the BLYP, BP86, and B3LYP levels of density functional theory in vacuo and in a polarizable continuum modeling bulk water (PCM) and have been studied at the BLYP level with Car-Parrinello molecular dynamics (MD) simulations in the gas phase and in explicit aqueous solution. Free binding energies were evaluated from static PCM data and from pointwise thermodynamic integration involving constrained MD simulations in water. The computations reveal significant solvent effects on geometric and energetic parameters. Based on the comparison of PCM-optimized or MD-averaged uranyl-ligand bond distances with EXAFS-derived values, the transition between five- and four-coordination about uranyl is indicated to occur at a Cl content of y = 2 or 3.

Original languageEnglish
Pages (from-to)2428-2436
Number of pages9
JournalJournal of Physical Chemistry A
Volume112
DOIs
Publication statusPublished - 20 Mar 2008

Keywords

  • 1ST-PRINCIPLES MOLECULAR-DYNAMICS
  • POLARIZABLE CONTINUUM MODEL
  • TEMPERATURE IONIC LIQUIDS
  • NEUTRON-DIFFRACTION
  • ACTINIDE CHEMISTRY
  • URANYL EXTRACTION
  • ORBITAL METHODS
  • WATER-EXCHANGE
  • AB-INITIO
  • BASIS SET

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