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- W2733382425 abstract "Thermodynamics of the U(VI) complexation with picolinic acid (HL) was investigated under constant ionic strength (1.05 mol·kg−1 NaClO4) with multiple techniques, including potentiometry, spectrophotometry and calorimetry. Three stepwise complexes, UO2L+, UO2L2(aq) and UO2L3−, were identified, and their formation constants were determined by potentiometric titrations at 283–313 K. The spectrophotometric work at 298 K further demonstrated the formation of these three complexes. By calorimetric titrations, stepwise enthalpies of the complexation at 298 K were determined to be ΔH11 = −(3.43 ± 0.24) kJ·mol−1, ΔH12 = −(3.3 ± 0.6) kJ·mol−1, and ΔH13 = 9.4 ± 0.6 kJ·mol−1. A formation of the 1:1 and 1:2 complexes is driven by both enthalpy and entropy, but the formation of the 1:3 complex by entropy only. The thermodynamic parameters also suggest that in the 1:1 and 1:2 complexes, picolinate coordinates to U(VI) through the chelation mode, i.e., one carboxylate oxygen and an aromatic nitrogen bind to the U(VI) atom." @default.
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- W2733382425 date "2017-10-01" @default.
- W2733382425 modified "2023-10-15" @default.
- W2733382425 title "Complexation of U(VI) with picolinic acid in aqueous solution at variable temperatures: Potentiometric, spectrophotometric and calorimetric studies" @default.
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- W2733382425 doi "https://doi.org/10.1016/j.jct.2017.07.002" @default.
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