A new amide tripodal ligand, 6-[2-(2-diethylamino-2-oxoethoxy)ethyl]-N,N,12-triethyl-11-oxo-3,9-dioxa-6,12-diazatetradecanamide (4) has been designed and synthesized for the recognition of rare earth ions. Three representative complexes of trivalent lighter (La), middle (Gd), and heavier (Er) rare earth ions with 4 were synthesized and characterized by X-ray crystallography. In the complex, the heptadentate 4 forms a cup-like coordination cavity encapsulating the central ion. Different supramolecular complex dimers are constructed by π–π interaction and van der Waals forces in accordance with the lanthanide contraction. The differences of the cavity and dimer structures were investigated further by assessing the separation efficiency of 4 in multitrace solvent extraction of rare earth ions from picrate acid solution and the ligand has the best separation factor for 147Pm(III).
一种新的
胺类三足
配体,6-[2-(2-二乙
氨基-2-氧基乙氧基)乙基]-N,N,12-三乙基-11-氧-3,9-二氧-6,12-二氮
四十四烷酰胺(4)被设计和合成用于稀土离子的识别。与
配体4合成并通过X射线晶体学表征了三种代表性的三价稀土离子复合物:轻稀土(La)、中稀土(Gd)和重稀土(Er)。在该复合物中,七齿
配体4形成一个杯状配位腔,封闭中心离子。不同的超分子复合物二聚体通过π–π相互作用和范德华力构建,与
镧系收缩相对应。通过评估4在从 picrate酸溶液中提取稀土离子的多重溶剂萃取分离效率,进一步研究了腔体和二聚体结构的差异,结果显示该
配体对147Pm(III)具有最佳分离因子。