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

Abstract Electrochemical behaviours of UO 2 (β-diketonate) 2 DMF, UO 2 (trop) 2 DMF 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) 2 DMF, −1.183 V for UO 2 (btfa) 2 DMF, −1.461 V for UO 2 (dbm) 2 DMF, −1.456 V for UO 2 (trop) 2 DMF and −1.585 V for UO 2 (sap)(DMF) 2 complex.