论文部分内容阅读
利用变温13C、1H－NMR研究了过量配体存在下，氨三乙酸稀土络合物Ln（NTA）2（Ln＝Ce，Pr和Nd）配体交换反应，在中性水溶液中，分子间的配体交换过程按如下机制进行：由溶液中自由NTA信号线宽分析了交换速率，确定了反应的活化能．结果表明，分子间配体交换反应的活化能与相应稀土络合物的热力学稳定性有一定关系．
The ligand-exchange reaction of Ln (NTA) 2 (Ln = Ce, Pr and Nd) in the presence of an excess of ligand was investigated by temperature-programmed 13 C and 1H-NMR. The ligand exchange process proceeds as follows: The exchange rate is determined from the free NTA signal line width in solution and the activation energy of the reaction is determined. The results show that the activation energy of the intermolecular ligand exchange reaction has a certain relationship with the thermodynamic stability of the corresponding rare earth complex.