Pentavalent uranyl complexes

Polly L. Arnold, Jason B. Love, Dipti Patel

Research output: Contribution to journalLiterature reviewpeer-review

Abstract

The uranyl dication, [UO2](2+), is the most prevalent and most thermodynamically stable form of uranium and is a soluble and problematic environmental contaminant. It is also extraordinarily chemically robust due to the strongly covalent trans-UO2 bonding. In contrast, the pentavalent uranyl cation [UO2](+) is unstable in an aqueous environment with respect to disproportionation into tetravalent uranium species and [UO2](2+). Aside from fundamental interest, an understanding of the pentavalent [UO2](+) cation is desirable since it is important environmentally as a key intermediate in the precipitation of uranium from groundwater.

In the last 2 years, the use of anaerobic coordination chemistry techniques and organometallic reagents has allowed the isolation of a few kinetically inert complexes containing the f(1) [UO2](+) cation. The synthesis and characterisation of these, and the insight they give into subsequent reactivity of the trans-UO2 unit, is discussed in this review. (C) 2009 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)1973-1978
Number of pages6
JournalCoordination Chemistry Reviews
Volume253
Issue number15-16
DOIs
Publication statusPublished - Aug 2009

Keywords

  • Uranyl
  • Uranium
  • Pentavalent
  • Disproportionation
  • Metal oxo
  • Multiple bonding
  • Cation-cation interactions
  • POWDER NEUTRON-DIFFRACTION
  • CATION-CATION INTERACTIONS
  • ELECTRONIC-STRUCTURE
  • URANIUM COMPLEXES
  • UNCONVENTIONAL SUPERCONDUCTIVITY
  • COORDINATION CHEMISTRY
  • CRYSTAL-STRUCTURE
  • REDOX ENERGETICS
  • AQUEOUS-SOLUTION
  • OXIDATION-STATE

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