Luminescence of UO2+sub(2(aq)) + FU+sub(2(aq)) and evidence for the formation of a new inorganic radiative exciplex in aqueous solution

Steady-state and time-resolved luminescence measurements, as well as decays of excited UO22+ + FUO2+ in aqueous solution, show the formation of a radiative exciplex, resulting from the interaction of *FUO2H+ with UO22+, similarly to the *U2O4H4+ exciplex already reported. Lifetimes and evaluations of the luminescence yields of the *UO22+, *FUO2+ and of the exciplex of probable *(O(F)UOHOUO)3+ composition, are given. The overall heat of the exciplex formation is estimated. (author)