Spectroscopy of UO2Cl42- in basic aluminum chloride 1-ethyl-3-methylimidazolium chloride

The optical absorption, emission, FT Raman, one-photon excitation, two-phot on excitation, and luminescence lifetime measurements are reported for UO2C l42- in 40:60 AlCl3-EMIC (where EMIC equivalent to 1-ethyl-3-methylimidazol ium chloride), a room-temperature ionic liquid. Comparison of the spectra w ith previous results from single crystals containing UO2Cl42- allowed the c haracterization of four ground-state vibrational frequencies, two excited-s tate vibrational frequencies, and the location of eight electronic excited- state energy levels. The vibrational frequencies and electronic energy leve ls are found to be consistent with the UO2Cl42- ion. Comparison of the one- photon and two-photon excitation spectra, and the relative intensities of t he transitions in the emission spectrum indicate that the center of symmetr y is perturbed by an interaction with the solvent.