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Hennig, C.*; Ikeda, Atsushi; Emmerling, F.*; Kraus, W.*; Bernhard, G.*
Dalton Transactions, 39(15), p.3744 - 3750, 2010/04
Times Cited Count:36 Percentile:81.24(Chemistry, Inorganic & Nuclear)The coordination of the limiting U(IV) carbonate species in aqueous solution was investigated by comparing its structure parameters with those of the complex preserved in a crystal structure. The U(IV) carbonate complex in the crystal structure was identified as a [U(CO)] anionic complex. This monomeric anion complex forms a network with charge compensating Na+ cations and HO ligands. U L3-edge EXAFS spectra were collected from the solid Na[U(CO)]12HO and the corresponding solution. The obtained data indicate the identity of the [U(CO)] complex in solid and solution states. The high negative charge of the [U(CO)] anionic complex is compensated by Na+ cations. In the solid state the Na+ cations form a bridging network between the [U(CO)] anion complex, while in the liquid state they seem to be located closer at the anionic complex anion.
Hennig, C.*; Kraus, W.*; Emmerling, F.*; Ikeda, Atsushi; Scheinost, A. C.*
Inorganic Chemistry, 47(5), p.1634 - 1638, 2008/02
Times Cited Count:29 Percentile:74.46(Chemistry, Inorganic & Nuclear)Uranium(IV) sulfate species in an aqueous solution and in the solid state has been investigated by extended X-ray absorption fine structure and X-ray diffraction. The coordination polyhedron was found to comprise unidentate and bidentate sulfate ions, and water molecules both in the aqueous solution phase and in the solid state.