Electrochemical Studies on [UO2(DMF)5](ClO4)2, UO2(acac)2DMF, and UO2(salen)DMF (DMF=N, N-dimethylformamide, acac=acetylacetonate, salen=N, N'-disalicylideneethylenediaminate) Complexes in DMF.

Electrochemical properties of uranium(VI) complexes with multidentate ligands in N,N-dimethylformamide

“…2. These phenomena are similar to those for UO 2 (acac) 2 DMF [7], and suggest that the UO 2 (ttfa) 2 DMF complex is reduced to [UO 2 (ttfa) 2 DMF] − quasi-reversibly with successive reactions through the following mechanism proposed previously [7,9],…”

“…3 with previous ones [7,8]. As seen from this table, the E 0 values become negative in order of uranyl(VI) complexes with unidentate(DMF), bidentate(ttfa, btfa, dbm, acac and trop), tridentate(sap) and tetradentate(salen, saloph) ligands.…”

“…However, the second anodic peaks are observed at around −0.83 and −1.21 for UO 2 (acac) 2 DMF [7] and UO 2 (acac) 2 DMSO [5], and at around −0.83 and −1.18 V for UO 2 (ba) 2 DMF and UO 2 (ba) 2 DMSO (ba, benzoylacetonate) [9], respectively. This supports that the electrochemical reactions (i) is followed by chemical reactions (ii) and (iii), that is, EC mechanism.…”

“…Hence, despite of many studies on U(V) formed by electrochemical and photochemical reductions of U(VI) species [2][3][4][5][6][7][8][9][10][11][12][13][14], its properties have not been clarified in details. We have investigated the electrochemical properties of U(VI) complex in carbonate solution [3] and U(VI) complexes in non-aqueous solution [4][5][6][7][8][9]. From results of such studies, we have proposed that uranyl complexes are reduced reversibly or quasireversibly to form relatively stable U(V) species, that the resulting U(V) species are yl-type, U V O 2 + , and that uranyl complexes with multidentate ligands can produce more stable U(V) complexes than those with unidentate ligands, [UO 2 L 5 ] 2+ .…”

Electrochemical Properties of Uranyl Ion in Ionic Liquids as Media for Pyrochemical Reprocessing

“…1 Schematic diagram of proposed processes of the reprocessing by using IL as media Electrochemical Properties of Uranyl Ion in Ionic Liquids as Media for Pyrochemical Reprocessing of magnitude smaller than those of UO 2 (dmso) 5 2þ (dmso: dimethyl sulfoxide) in dmso at 25 C (1:6 Â 10 À6 cm 2 Ás À1 ) and UO 2 (dmf) 5 2þ (dmf: N,N-dimethylformamide) in dmf at 23 C (2:6 Â 10 À6 cm 2 Ás À1 ), and so on. 11,12) This is considered to be due to the high viscosity of BMICl.…”