Journal ArticleDOI
Uranyl Coordination in Ionic Liquids: The Competition between Ionic Liquid Anions, Uranyl Counterions, and Cl- Anions Investigated by Extended X-ray Absorption Fine Structure and UV−Visible Spectroscopies and Molecular Dynamics Simulations
Clotilde Gaillard,Alain Chaumont,Isabelle Billard,Christoph Hennig,and A. Ouadi,Georges Wipff +5 more
TLDR
The first coordination sphere of the uranyl cation in room-temperature ionic liquids (ILs) results from the competition between its initially bound counterions, the IL anions, and other anions (e.g., present as impurities or added to the solution).Abstract:
The first coordination sphere of the uranyl cation in room-temperature ionic liquids (ILs) results from the competition between its initially bound counterions, the IL anions, and other anions (e.g., present as impurities or added to the solution). We present a joined spectroscopic (UV−visible and extended X-ray absorption fine structure)-simulation study of the coordination of uranyl initially introduced either as UO2X2 salts (X- = nitrate NO3-, triflate TfO-, perchlorate ClO4-) or as UO2(SO4) in a series of imidazolium-based ILs (C4mimA, A- = PF6-, Tf2N-, BF4- and C4mim = 1-methyl-3-butyl-imidazolium) as well as in the Me3NBuTf2N IL. The solubility and dissociation of the uranyl salts are found to depend on the nature of X- and A-. The addition of Cl- anions promotes the solubilization of the nitrate and triflate salts in the C4mimPF6 and the C4mimBF4 ILs via the formation of chloro complexes, also formed with other salts. The first coordination sphere of uranyl is further investigated by molecular dyna...read more
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Ionic Liquids-Based Extraction: A Promising Strategy for the Advanced Nuclear Fuel Cycle
TL;DR: Ionic Liquids-Based Extraction: A Promising Strategy for theAdvanced Nuclear Fuel Cycle Xiaoqi Sun, Huimin Luo, and Sheng Dai.
Journal ArticleDOI
Ionic Liquids for Lanthanide and Actinide Chemistry
Anja-Verena Mudring,Si-Fu Tang +1 more
TL;DR: Ionic liquid chemistry has developed into a tremendously popular field of chemistry in the last decade as mentioned in this paper, and it has been realized that ionic liquids show features that cannot be realized in conventional molecular solvents.
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Probing the Nature of Chemical Bonding in Uranyl(VI) Complexes with Quantum Chemical Methods.
TL;DR: This study demonstrates that it is possible to describe the nature of chemical bond by observables rather than by ad hoc quantities such as atomic populations or molecular orbitals.
Journal ArticleDOI
Speciation of uranyl complexes in ionic liquids by optical spectroscopy.
Peter Nockemann,Kelly Servaes,Rik Van Deun,Kristof Van Hecke,Luc Van Meervelt,Koen Binnemans,Christiane Görller-Walrand +6 more
TL;DR: The competition between 18-crown-6 and small inorganic ligands for coordination to the uranyl ion was investigated and the crystal structures of the hydrolysis product [(UO2)2 (mu2-OH)2(H2O)6] and imidazolium salt [C6mim]2[ UO2Br4] are described.
Journal ArticleDOI
Exploring actinide materials through synchrotron radiation techniques
Wei-Qun Shi,Li-Yong Yuan,Cong-Zhi Wang,Lin Wang,Lei Mei,Chengliang Xiao,Li Zhang,Zijie Li,Yuliang Zhao,Zhifang Chai,Zhifang Chai +10 more
TL;DR: In this review, recent research progresses on actinide related materials by means of various SR techniques were selectively highlighted and summarized, with the emphasis on X-ray absorption spectroscopy,X-ray diffraction and scattering spectroscology, which are powerful tools to characterize actinid materials.