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 language | English |
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Pages (from-to) | 1973-1978 |
Number of pages | 6 |
Journal | Coordination Chemistry Reviews |
Volume | 253 |
Issue number | 15-16 |
DOIs | |
Publication status | Published - Aug 2009 |
Keywords / Materials (for Non-textual outputs)
- 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