Abstract
Nonexponential uranyl luminescence decay curves corresponding to the liminescence of different complex species was found in solutions containing very small amounts of fluoride or phosphate. The luminescence lifetimes of uranyl aquo ion, 1:1 and 1:2 uranyl fluoro complexes are determined to be 2.4, 75 and 150 μs, respectively (25°C, 0.1 M HClO 4, μ = 1), The rate of formation of 1:1 uranyl fluoro complex in an excited state (UO 2 2+∗ + F − → UO 2F +∗) is smaller than the rate of deactivation of uranyl aquo ion, but the equilibrium UO 2F +∗ + F − ⇄ UO 2F 2 ∗ is attained within the luminescence lifetimes of UO 2F +∗ and UO 2F 2 ∗. Kinetic characteristics of complexes formed between UO 2 2+ and sulfate or phosphate was also discussed.
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