Comparative UV−Vis Studies of Uranyl Chloride Complex in Two Basic Ambient-Temperature Melt Systems:  The Observation of Spectral and Thermodynamic Variations Induced via Hydrogen Bonding

Electrochemical Studies on Uranyl(VI) Chloride Complexes in Ionic Liquid, 1-Butyl-3-methylimidazolium Chloride

“…This absorption spectrum is found to exhibit a remarkable vibrational fine structure, which is similar to that of [UO 2 Cl 4 ] 2À in AlCl 3 /EMIC (EMIC = 1-ethyl-3-methylimidazolium chloride), 14) BMITf 2 N, MeBu 3 NTf 2 N, and C 4 minTf 2 N (Tf 2 N = bis(trifluoromethanesulfonyl)imide, MeBu 3 N = tri-n-butylmethyl-ammonium, C 4 min = 1-hexyl-3-methylimidazolium). 19,24) Nockemann et al have reported that the fine structure is typical for […”

“…[4][5][6][7][8][9][10][11][12] In the nuclear industry field, applications of ILs as media for reprocessing of spent nuclear fuels and treatment of radioactive wastes contaminated with uranium have been proposed, and basic studies on properties of uranyl species in ILs have been performed extensively. [13][14][15][16][17][18][19][20][21][22][23][24][25][26] Recently, we studied the dissolution behavior of uranium oxides (UO 2 and U 3 O 8 ) in 1-butyl-3-methylimidazolium chloride (BMICl), tetrafluoroborate (BMIBF 4 ), and nonafluorobutanesulfonate (BMINfO), and the electrochemical properties of uranyl species in these ILs to examine their feasibility as alternatives to conventional molten salts as media for pyro-reprocessing processes for spent nuclear fuels. [27][28][29] As a result, we clarified that UO 2 2þ species in BMICl are almost reversibly reduced to UO 2 þ and that UO 2 2þ species in BMINfO are reduced to U(IV) with formation of deposits on the electrode.…”

Separation of fission products based on ionic liquids: Task-specific ionic liquids containing an aza-crown ether fragment

“…The applications of ionic liquids (ILs) as replacement solvents for various catalytic reactions and separation processes have been extensively explored [1][2][3][4][5][6][7][8]. The structure templates for the two most common classes of room-temperature ionic liquids are shown in Fig.…”

Electrochemical Studies on Uranyl(VI) Chloride Complexes in 1-Butyl-3-methyl- imidazolium Based Ionic Liquids and Their Application to Pyro-Reprocessing and Treatment of Wastes Contaminated with Uranium

“…Figure 1(a) shows the UV-visible absorption spectrum of the solution prepared by dissolving Cs 2 UO 2 Cl 4 into BMICl at 80˚C. This absorption spectrum is found to exhibit remarkable vibrational fine structure, which is similar to that of [UO 2 Cl 4 ] 2-in AlCl 3 /EMIC (EMIC = 1-ethyl-3-methylimidazolium chloride) (Dai et al, 1997), BMITf 2 N, MeBu 3 NTf 2 N, and C 4 minTf 2 N (Tf 2 N = bis(trifluoromethanesulfonyl)imide, MeBu 3 N = tri-n-butylmethylammonium, C 4 min = 1-hexyl-3-methylimidazolium) (Sornein et al, 2006;Nockemann et al, 2007). Nockemann et al have reported that the fine structure is typical for the [UO 2 Cl 4 ] 2-with D 4h coordination symmetry (Nockemann et al, 2007).…”