Electronic and vibrational spectra of [Me4N]2UO2Cl4

Abstract

Raman, polarised infrared, electronic absorption and luminescence spectra of [Me₄N]₂UO₂Cl₄ have been measured at temperatures down to 10 K. The four lowest excited states have B_2g, B_3g, A_g and B_1g symmetry in D_2h symmetry. These are analogous to the corresponding states in Cs₂UO₂Cl₄. The crystals readily absorb water from laboratory air with the creation of non-equivalent uranyl sites. A previous interpretation of the spectra of this compound is incorrect.