Carbonates of Uranium

Network Dimensionality of Selected Uranyl(VI) Coordination Polymers and Octopus-like Uranium(IV) Clusters

“…A possibility could be that the solvent mixture, which contained ethanol and THF may have allowed for a slow reduction to occur while being exposed to ambient sunlight. It has been known for decades that photo reduction of U­(VI) to U­(IV) can take place in alcoholic solutions. , …”

“…It has been known for decades that photo reduction of U(VI) to U(IV) can take place in alcoholic solutions. 99,100 In Figure 11a we depict the view onto the ab plane, showing the interlinkage of uranium-central atoms via hydroxy-anions (maroon O atoms), glutarate linkers (black tetrahedra), and the construction of large clusters involving six U atoms. This structure incorporates two crystallographically independent uranium(IV) metal centers, U(1) (dark gray) and U(2) (light gray).…”

Uranium secondary phase formation during anoxic hydrothermal leaching processes of UO2 nuclear fuel

“…The pure U(IV)carbonate U(CO 3 ) 2 is not known. The basic carbonate UO(CO 3 ) that can be generated in U(IV) solution upon addition of (NH 4 ) 2 (CO 3 ) (which was reported to be stable [55]), might theoretically have formed but little facts are known about the conditions under which this happens; the substance is not known to form naturally. Therefore, U(IV) carbonate phases were not taken into account in quantitative consideration during the evaluation of the present work.…”

The tris(carbonato)dioxouranium(VI) ion: A structural model for uranium 4f7/2, 5/2 X-ray photoelectron spectra satellite structures for oxide and oxygen coordination cores

“…Other reactions of CO 2 under pressure with uranium compounds also have been shown to produce anhydrous carbonates. The use of synthesized, reactive intermediates such as UO 2 CO 3 $2.5H 2 O followed by thermal decomposition also yields anhydrous carbonates [12]; synthetic approaches of this type run the risk of resulting in mixed, impure final products. Fig.…”