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Journal Articles

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

Kim, S.-Y.; Asakura, Toshihide; Morita, Yasuji; Ikeda, Yasuhisa*

Journal of Alloys and Compounds, 408-412, p.1291 - 1295, 2006/02

https://doi.org/10.1016/j.jallcom.2005.04.123

Times Cited Count：10 Percentile：54.65(Chemistry, Physical)

The electrochemical reactions of UO $_{2}$ (-diketonato) $_{2}$ DMF, UO $_{2}$ (trop) $_{2}$ DMF and UO $_{2}$ (sap)(DMF) $_{2}$ , (DMF = N,N-dimethylformamide, -diketonate = thenoyltrifluoroacetonate (ttfa), benzoyltrifluoroacetonate (btfa), and dibenzoylmethanate(dbm), trop = tropolonate, and sap = 2-salicylidenaminophenolate) complexes in DMF solution containing tetrabutyl ammonium perchlorate as a supporting electrolyte have been studied with cyclic voltammetry. These uranyl(VI) complexes were found to be quasi-reversibly reduced to U(V) species. The formal redox potentials (E $^{o}$ , . ferrocene/ferrocenium) for U(VI)/U(V) couples were determined to be -1.18 V for UO $_{2}$ (ttfa) $_{2}$ DMF, -1.18 V for UO $_{2}$ (btfa) $_{2}$ DMF, -1.46 V for UO $_{2}$ (dbm) $_{2}$ DMF, -1.46 V for UO $_{2}$ (trop) $_{2}$ DMF, and -1.59 V for UO $_{2}$ (sap)(DMF) $_{2}$ .

Journal Articles

Electrochemical and spectroelectrochemical behaviour of Np(VI) ions in nitric acid solutions

Kim, S.-Y.; Asakura, Toshihide; Morita, Yasuji

Radiochimica Acta, 93(12), p.767 - 770, 2005/12

https://doi.org/10.1524/ract.2005.93.12.767

Times Cited Count：10 Percentile：56.74(Chemistry, Inorganic & Nuclear)

Electrochemical and spectroelectrochemical has been used to investigate the behaviour of Neptunium (VI) in concentration 1-8 M HNO $_{3}$ solutions. The electrochemical reactions of Np(VI) ions were found to occur quasi-reversibly. The formal redox potentials (E $^{circ}$ ) for Np(VI)/Np(V) couples were determined to be +0.906, +0.908, +0.909, +0.902, +0.896, +0.895, +0.888, and +0.884 V (vs. Ag/AgCl) for Np(VI) ions in 1, 2, 3, 4, 5, 6, 7, 8 M HNO $_{3}$ solutions, respectively. The reduction processes of Np(VI) ions were followed spectroelectrochemically by using an optical transparent thin layer electrode cell. It was found that the absorption spectra measured at the applied potentials from +1.10 to +0.60 V versus Ag/AgCl reference electrode redox couple for Np(VI) in HNO $_{3}$ solution have clear isosbestic points. These results indicate that the reduction product of Np(VI) is Np(V), which is considerably stable in HNO $_{3}$ solution.

Journal Articles

Electrochemical studies of plutonium(IV) complexes in aqueous nitrate solutions

Kim, S.-Y.; Asakura, Toshihide; Morita, Yasuji

JAERI-Conf 2005-007, p.341 - 344, 2005/08

https://jopss.jaea.go.jp/pdfdata/JAERI-Conf-2005-007.pdf

Electrochemistry has been used to investigate the behavior of plutonium(IV) in 1-7 M HNO $_{3}$ solutions. These Pu(IV) complexes were found to be reduced quasi-reversibly to Pu(III) species. The formal redox potentials (E $^{o}$ ) for Pu(IV)/Pu(III) couples were determined to be +0.721, +0.712, +0.706, +0.705, +0.704, 0.694, and +0.696 V (vs. Ag/AgCl(SSE)) for Pu(IV) complexes in 1, 2, 3, 4, 5, 6, 7 M HNO $_{3}$ solutions, respectively. These results indicate that the reduction product of Pu(IV) is Pu(III), which is considerably stable in HNO $_{3}$ solution.

Journal Articles