Uranyl(VI) complexes of ethylene-1,2-dioxydiacetic acid and ethylene-1,2-diaminodiacetic acid in aqueous solution: a potentiometric and calorimetric study |
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| Institution: | 1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;2. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China;3. School of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013, China;1. ICGM, Univ. Montpellier, CNRS, ENSCM, Montpellier, France;2. IBMM, Univ. Montpellier, CNRS, ENSCM, Montpellier, France;1. Aqueous Separations and Radiochemistry Department, Idaho National Laboratory, Idaho Falls, ID, United States;2. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States |
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| Abstract: | The stability constants and the changes in enthalpy and entropy for the formation of uranyl(VI) complexes with dicarboxylate ligands of the type (-CH2RCH2COO)22−, where RO or NH, have been determined by potentiometric and calorimetric titrations at 25.0 °C in 1.0 mol dm−3 aqueous solution of sodium perchlorate.The ethylene-l,2-dioxydiacetate ligand forms either 1:1 and 1:2 chelated complexes or unchelated protonated complexes, owing to the low stability of the chelate ring. Because of precipitation of solid compounds only one complex of 1:1 stoichiometry was observed in the uranyl(VI)—ethylene-l,2-diaminodiacetate system.Factors influencing the stability constants and the enthalpy and entropy changes in the uranyl(VI) complexes with these potentially tetradentate ligands are discussed in comparison with analogous complexes involving bi- and tridentate dicarboxylate ligands. |
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