Electrolytic preparation, redox titration and stability of pentavalent state of uranyl tetraketonate in dimethyl sulfoxide

Electrodeposition of uranium in dimethyl sulfoxide and its inhibition by acetylacetone as studied by EQCM

“…The uranium battery has been studied by using uranium ␤-diketone complexes in aprotic solvents [3] in order to avoid the disproportionation reaction of U(V) from degrading to U(IV) and U(VI) in the presence of the proton [4,5]. Recently, we reported a quantitative electrolysis of the dimethyl sulfoxide (DMSO) solution of U(VI) to give the U(V) solution which was relatively stable as the half-life of 2 days at 16 • C [6,7].…”

The Chemistry of Redox‐Flow Batteries

“…Auranyl RFB,however, has not yet been built, since the uranyl complex tends to dissociate.Y amamura et al undertook further investigations to find more-stable ligands for the system. [266][267][268] As with the uranium system, ahigh efficiency in the use of neptunium compounds is expected. [241,242,269] An efficiencyo f about 99 %h as been estimated by means of electrochemical calculations.I ns uch ac ell, an eptunium complex would be present in the anolyte and ad ineptunyl complex with the transitions of Np 3+ to Np 4+ and NpO 2 2+ to NpO 2 + in the catholyte.A sar esult of the high radioactivity of Np,n o attempts have been made under electrolyte convection mode.…”

Electrochemical and spectroscopic investigations of uranium(III) with N,N,N′,N′-tetramethylmalonamide in DMF

“…It is well known that U(VI) and U(IV) complexes of acetylacetone are stable whereas that of U(V) had been never prepared. Recently, stable solutions of U(V) complexes with acetylacetonate and benzoylacetonate were obtained [17,18]. However, preparation of the U(III) complex with ␤-diketone ligands was not possible in accordance with the report that the acetylacetone oxidizes U(III) to give U(IV) [19].…”