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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A small-molecular europium complex with anion sensing sensitivity
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A small-molecular europium complex with anion sensing sensitivity

机译：具有阴离子感测灵敏度的小分子euro络合物

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摘要

A novel small-molecular europium(iii) complex with quinoline derivative has been designed and prepared for anion recognition. This Eu ~(3+) complex displays striking emission changes at 616 nm in response to NO _3 ~- and Cl ~-. What's more, the anion-selective luminescence enhancement is easily detected by the naked eye. UV, luminescence titration experiments and the Job plot analysis revealed that the ligand can form stable 1:1 complexes with Eu(NO _3) _3 or EuCl _3 in CH _3CN; log K = 7.10 and 6.76 (295 K), respectively. The crystal structure shows that three oxygen atoms and one nitrogen atom of the ligand are approximately coplanar and wrap around the Eu ~(3+) ion through a semicircle-shaped coordination structure and some unoccupied sites of the central europium ions are available for guest anions in the complexes. Thus, three nitrate ions are located in the gap of the semicircle. It is supposed that the mechanism of luminescence enhancement is of NO _3 ~- or Cl ~- anions squeezing out solvent molecules from the inner coordination sphere.
机译：一种新型的具有喹啉衍生物的小分子euro（iii）配合物已被设计并制备用于阴离子识别。此Eu〜（3+）络合物在616 nm处响应NO _3〜-和Cl〜-表现出惊人的发射变化。此外，用肉眼很容易检测到阴离子选择性发光增强。紫外，发光滴定实验和Job图分析表明，配体可与CH_3CN中的Eu（NO_3）_3或EuCl_3形成稳定的1：1络合物。 log K分别为7.10和6.76（295 K）。晶体结构表明，配体的三个氧原子和一个氮原子近似共面，并通过半圆形配位结构环绕Eu〜（3+）离子，并且中心and离子的一些未占据位点可用于客体阴离子在复杂。因此，三个硝酸根离子位于半圆的间隙中。推测发光增强的机理是NO _3〜-或Cl〜-阴离子从内部配位球中挤出溶剂分子。

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