Acta Phys. -Chim. Sin. ›› 1994, Vol. 10 ›› Issue (09): 785-789.doi: 10.3866/PKU.WHXB19940904

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Ligand Exchange Reactions of Lanthanide Complexes with Nitrilotriacetate Ln(NTA)2 by 13C and 1H NMR

Ren Ji-Min, Jing Feng-Ying, Pei Feng-Kui, Wang Wen-Yun, Ni Jia-Zuan   

  1. Changchun Institute of Applied Chemistry,Changchun 130022
  • Received:1993-04-02 Revised:1993-07-31 Published:1994-09-15
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Abstract:

 Ligand exchange reactions were studied by VT 13C and 1H NMR for lanthanide complexes with nitrilotriacetate Ln(NTA)2 in neutral aqueous solution in the presence of an excess of ligand (Ln=Ce, Pr and Nd). The intermolecular ligand exchange occurs by the following mechanism
Ln（NTA）23- ×H*NTA2-↔ Ln（*NTA）（NTA）3+ + HNTA2-
The exchange rates were analysed from the line-width values of free NTA and it is found that the activation energy values of the ligand exchange are related to the thermodynamic stability of the corresponding lanthanide complexes with NTA.

Key words: Nitrilotriacetate, Lanthanide cmplex, NMR