Electrochemical redox reactions of uranium(VI) complexes with multidentate ligands in dimethyl sulfoxide

Seong Yun Kim, Toshihide Asakura, Yasuji Morita, Gunzo Uchiyama, Yasuhisa Ikeda

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Electrochemical reactions of UO2(β-diketonato) 2-dmso, UO2(trop)2dmso, UO2(sap) (dmso)2, and UO2(salen)dmso (dmso = dimethyl sulfoxide, β-diketonate = benzoylacetonate (ba), benzoyltrifluoroacetonate (btfa), and thenoyltrifluoroacetonate (ttfa), trop = tropolonate, sap = 2-salicylidenaminophenolate, and salen = N,N′- disalicylidenethylenediaminate) complexes in dmso solutions containing tetrabutylammonium perchlorate as a supporting electrolyte have been studied with cyclic voltammetry. These uranyl(VI) complexes were found to be reduced quasi-reversibly to U(V) species. The formal redox potentials (E°, vs. ferrocen/ferrocenium) for U(VI)/U(V) couples were determined to be - 1.416 V for UO2(ba)2dmso, - 1.073 V for UO2(btfa) 2dmso, -1.082 V for UO2(ttfa)2dmso, -1.379 V for UO2(trop)2dmso, -1.500 V for UO2(sap)(dmso) 2, and -1.602 V for UO2(salen)dmso. Furthermore, the resulting U(V) complexes, [UO2(btfa)2dmso]-, [UO2(ttfa)2dmso]-, and [UO2(salen) dmso]-, were found to be able to exist stably in dmso solutions.

Original languageEnglish
Pages (from-to)75-81
Number of pages7
JournalRadiochimica Acta
Issue number2
Publication statusPublished - 2005


  • Cyclic voltammetry
  • Electrochemistry
  • Multidentate ligands
  • Redox reaction
  • Uranyl complexes


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