Complexation of trivalent lanthanides and actinides was studied in a room temperature ionic liquid (RTIL) using five N‐pivot tripodal diglycolamide ligands (L_I–L_V) having different structural features, viz. spacer lengths and substituents. The nature of the metal/Ligand complex changed with the substitution of N atom near the tripodal platform from ML with L_III and L_IV to ML₂ with L_I, L_II and L_V (where M = Eu³⁺/Nd³⁺/Am³⁺). With 0.2 mmol/L ligands, the distribution ratio of Am³⁺ at 1 m HNO₃ followed the order: L_I (210) > L_II (42) > L_III (2.1) > L_V (0.7) > L_IV (0.2). The formation constants between Nd³⁺ and the ligands (log β_ML,ML2) followed an identical order, viz. L_I > L_II > L_III > L_V > L_IV. The extraction of Am³⁺ or Eu³⁺ with all the ligands followed a cation‐exchange extraction mechanism, which is in sharp contrast to the results obtained in a molecular solvent (n‐dodecane), where a solvation extraction mechanism prevalied. Luminescence studies on the Eu³⁺ extract in RTIL confimed the absence of water molecules in the inner coordination sphere of the complex. EXAFS studies indicated that all three DGA arms were binding to the Eu³⁺ cation.

中文翻译：

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在离子液体中使用几种N-轴三脚架二甘醇酰胺配体高效提取三价f-阳离子：配体结构对金属离子络合的作用

三价镧系元素和锕系元素的络合在使用五个室温离子液体（RTIL）进行了研究Ñ -pivot三脚二乙二醇配体（大号_我-大号_V具有不同的结构特征，即）。间隔长度和取代基。金属/配体配合物的性质随着三脚架平台附近的N原子的取代而从具有L _III和L _IV的ML变为具有L _I，L _II和L _V的ML ₂（其中M = Eu ³⁺ / Nd ³⁺ /上午³⁺）。在配体为0.2 mmol / L的情况下，Am ³⁺在1 m HNO _3上的分布比例为：L _I（210）> L _II（42）> L _III（2.1）> L _V（0.7）> L _IV（ 0.2）。钕之间的形成常数³⁺和配位体（对数 β _{ML，ML 2}），然后一个相同的顺序，即 L _I > L _II > L _III > L _V > L _IV。Am的提取具有所有配体的³⁺或Eu ³⁺遵循阳离子交换萃取机理，这与在分子溶剂（正十二烷）中获得溶剂化萃取机理的结果形成鲜明对比。在RTIL中对Eu ³⁺提取物进行的发光研究证实了该复合物内部配位域中不存在水分子。EXAFS研究表明，所有三个DGA臂均与Eu ³⁺阳离子结合。