Abstract
UV-visible absorption spectra of solutions prepared by dissolving Cs2UO2Cl4 or UO2Cl2.nH2O into 1-butyl-3-methylimidazolium chloride (BMICl) have been measured. As a result, it was clarified that uranyl species in BMICl exist as [UO2Cl4]2–. Cyclic voltammograms of [UO2Cl4]2– in BMICl were measured at 80 ± 1°C using a glassy-carbon working electrode, a platinum wire counterelectrode, and a Ag/AgCl reference electrode with a liquid junction filled with BMIBF4 in a glove box under Ar atmosphere. Peaks corresponding to one redox couple were observed around −0:73 (Epc) and −0:65V (Epa). The potential differences between two peaks (ΔEp) at scan rates in the range from 10 to 50mVs−1 are 70–80mV, and are almost consistent with the theoretical ΔEp value (67 mV) for the reversible one-electron-transfer reaction at 80°C. Furthermore, the (Epc + E pa/2 value is constant, −0:690 V, regardless of the scan rate. From these results, it is concluded that [UO2Cl4]2—in BMICl is reduced to [UO2Cl4]3—quasi-reversibly.
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