Abstract
Luminescence of uranyl ion (UO22+) complexed with picolinate (PA) has been studied in aqueous and acetonitrile medium. In aqueous medium, for UO22+ to PA ratio of up to 1:20, a 1:1 non-luminescent specie with stability constant of log β = 3.88 was formed. On the contrary, formed specie in acetonitrile medium was luminescent and the enhanced luminescence was due to sensitization by PA and reduction in non-radiative decay channels. UV–Vis absorption spectroscopy studies revealed that the luminescent specie was 1:2 type complex. Density functional theory and DLPNO-CCSD(T) methodologies were applied to arrive at the lowest-energy structures of the 1:1 and 1:2 uranyl–picolinate complexes.
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