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- W2339548397 abstract "We report and discuss here the unambiguous uranium valence state determination on the complex compound [Ni(H2O)4]3[U(OH,H2O)(UO2)8O12(OH)3] by using high-energy-resolution fluorescence detection-X-ray absorption near-edge structure spectroscopy (HERFD-XANES). The spectra at both U L3- and M4-edges confirm that all five nonequivalent U atoms are solely in the hexavalent form in this compound, as previously suggested by bond-valence-sum analysis and X-ray diffraction pattern refinement. Moreover, the presence of the preedge feature, due to the 2p3/2-5f quadrupole transition, has been observed in the U L3-edge HERFD-XANES spectrum, in agreement with theoretical and experimental observations of other uranium-based compounds. Recently, this feature has been proposed as a possible tool to determine the uranium oxidation state in a manner similar to that of 3d and 4d metals. Nevertheless, this feature is also very sensitive to the uranium local environment, as revealed by our theoretical calculations, and consequently could not be used to attribute without ambiguity the uranium valence state. In contrast, U M4-edge HERFD-XANES appears to be the most straightforward and reliable way to assess the uranium valence state in very complex materials such as [Ni(H2O)4]3[U(OH,H2O)(UO2)8O12(OH)3] or a mixture of compounds." @default.
- W2339548397 created "2016-06-24" @default.
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- W2339548397 date "2016-04-13" @default.
- W2339548397 modified "2023-09-24" @default.
- W2339548397 title "Use of HERFD–XANES at the U L<sub>3</sub>- and M<sub>4</sub>-Edges To Determine the Uranium Valence State on [Ni(H<sub>2</sub>O)<sub>4</sub>]<sub>3</sub>[U(OH,H<sub>2</sub>O)(UO<sub>2</sub>)<sub>8</sub>O<sub>12</sub>(OH)<sub>3</sub>]" @default.
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- W2339548397 doi "https://doi.org/10.1021/acs.inorgchem.6b00014" @default.
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