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Luminescent versus non-luminescent uranyl–picolinate complexes

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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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  1. Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India

    Satendra Kumar, S. Maji, Gopinadhanpillai Gopakumar, M. Joseph, K. Sundararajan & K. Sankaran

  2. Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India

    Satendra Kumar, M. Joseph, K. Sundararajan & K. Sankaran

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  1. Satendra Kumar
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Kumar, S., Maji, S., Gopakumar, G. et al. Luminescent versus non-luminescent uranyl–picolinate complexes. J Radioanal Nucl Chem 318, 2145–2156 (2018). https://doi.org/10.1007/s10967-018-6305-3

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