Journal of Radioanalytical and Nuclear Chemistry

, Volume 203, Issue 1, pp 177–187 | Cite as

31P-NMR study of the organophosphorous complexes of uranium(VI)

I. The intermolecular ligand exchange kinetics in uranyl nitrate complexes with TBP and TOPO
  • A. Vasilescu-Saidel
  • C. N. Turcanu
  • R. Grosescu


The intermolecular ligand exchange in uranyl nitrate complexes with TBP and TOPO is studied by31P-NMR. The constant rates at 25°C in CCl4 are: (8.47±1.86)·103 s−1 for U-TBP and (1.3±0.04)·104M−1·s−1 for U-TOPO system. The very similar activation parameters values of the ligand exchange suggest the same mechanism for both systems, namely an one-step interchange mechanism. The differences between the systems regarding the rate equations and the extraction properties are discussed.


Nitrate Physical Chemistry Inorganic Chemistry Uranium Uranyl 
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Copyright information

© Akadémiai Kiadó 1996

Authors and Affiliations

  • A. Vasilescu-Saidel
    • 1
  • C. N. Turcanu
    • 1
  • R. Grosescu
    • 1
  1. 1.Institute for Physics and Nuclear EngineeringBucharest-Magurele(Romania)

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