Electronic Absorption Spectra of Uranium(V) Species in Fused Alkali Chlorides

Electronic absorption spectra of uranium(V) dioxochloro-ions were recorded in a range of alkali chloride melts at 350-850 oC. The effect of temperature and second coordination sphere on the electronic transitions in UO2Cl43- ions were analyzed. Temperature has a relatively minor effect on the band positions in the spectra. The effect of the cationic composition of the melt is more pronounced and the energies of φ5u → 3π1u and φ5u → 3π3u transitions shift to the higher values with increasing radii of the solvent melt cations.