Abstract

Electrochemical behaviours of UO 2(β-diketonate) 2DMF, UO 2(trop) 2DMF and UO 2(sap)(DMF) 2, (DMF, N, N-dimethylformamide; β-diketonate, thenoyltrifluoroacetonate(ttfa); benzoyltrifluoroacetonate(btfa) and dibenzoylmethanate(dbm); trop, tropolonate and sap, 2-salicylidenaminophenolate) complexes in DMF solution containing tetrabutylammonium perchlorate as a supporting electrolyte have been investigated by cyclic voltammetry. These uranyl(VI) complexes were found to be quasi-reversibly reduced to U(V) species. The formal redox potentials ( E 0, versus ferrocene/ferrocenium) for U(VI)/U(V) couples were determined to be −1.176 V for UO 2(ttfa) 2DMF, −1.183 V for UO 2(btfa) 2DMF, −1.461 V for UO 2(dbm) 2DMF, −1.456 V for UO 2(trop) 2DMF and −1.585 V for UO 2(sap)(DMF) 2 complex.

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