Abstract Phenanthroimidazole-based cage-ligands 1 and 2 and their Eu(III), La(III) lanthanide complexes were synthesized and characterized. Schiff base condensation is the main step to obtain cage-shaped ligand design. Connection between clicked-phenanthroimidazole dipodal aldehyde and a fluorescent amine resulted great numbers of possible bindings that make the cage-shaped ligands suitable for lanthanide bindings. Lanthanide selectivities of the ligands 1 and 2 were investigated towards Dy(III), Yb(III), Er(III), Tb(III), La(III) and Eu(III) ions by absorption and emission studies in half-aqueous medium. The binding stoichiometries with the most fluorescence quenching ion Eu(III) were determined by Job's plotting as 1:1 ratio between ligand/Eu(III). The binding constants were calculated as 1.074 × 104 M−1 for 1 and 6.67 × 103 M−1 for 2 according to the concentration studies and the limit of detections (LOD) were determined as 5.23 × 10−4 μM for 1 and 4.65 × 10−4 μM for 2 by Benesi-Hildebrand plotting.

中文翻译：

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基于菲咪唑的点击笼配体的镧系元素结合；由席夫碱缩合设计

摘要 合成并表征了基于菲咪唑的笼配体 1 和 2 及其 Eu(III)、La(III) 镧系元素配合物。席夫碱缩合是获得笼形配体设计的主要步骤。点击菲咪唑二足醛和荧光胺之间的连接导致了大量可能的结合，使笼形配体适合镧系元素结合。通过在半水溶液中的吸收和发射研究，研究了配体 1 和 2 对 Dy(III)、Yb(III)、Er(III)、Tb(III)、La(III) 和 Eu(III) 离子的镧系选择性中等的。具有最多荧光猝灭离子 Eu(III) 的结合化学计量由 Job 绘图确定为配体/Eu(III) 之间的 1:1 比率。1 和 6 的结合常数计算为 1.074 × 104 M-1。