<br>一种基于镧系元素功能化 MOF 的新型比率荧光传感器，用于 Hg2+ 检测,Talanta

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一种基于镧系元素功能化 MOF 的新型比率荧光传感器，用于 Hg2+ 检测
Talanta ( IF 5.6 ) Pub Date : 2022-06-30 , DOI: 10.1016/j.talanta.2022.123710
Ning Wu Hao Guo ₁ , Liping Peng ₁ , Yuan Chen ₁ , Yinsheng Liu ₁ , Cuiliu Li ₁ , Hao Zhang ₁ , Wu Yang ₁

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合成后改性是制备稀土有机框架材料和衍生高性能功能材料的有效策略。在这里，我们报道了使用 Ca-MOF 作为母体框架的双发射 Ln-MOF 材料（Eu-Ca-MOF）的制备，并通过合成后修饰将 Eu3 + 离子引入其通道。Eu-Ca-MOF 具有良好的光致发光性能，可用作比率荧光传感器（I381/I590），以敏感地检测水中的 Hg2+ 离子。获得的 Eu-Ca-MOF 的特性是，当材料分散在含有 Hg2+ 离子的水溶液中时，配体在 381 nm 处的特征发射增强，而 Eu3+ 在 590 nm 处的特征发射被淬灭。两种发射的峰高比可用于实现 Hg2+ 离子的高灵敏度检测，即使存在其他潜在竞争分析物也是如此。此外，Hg2+ 诱导 Eu-Ca-MOF 产生显着的比率发光响应，使其发光颜色由红色变为蓝色，有利于肉眼的视觉分析。同时，Eu-Ca-MOF 具有更宽的检测范围（0.02–200 μM），对 Hg2+ 离子的检测下限（2.6 nM）。通过合成后改性制备的镧系化合物为光致发光材料提供了一种有效的合成策略。

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A novel ratiometric fluorescence sensor based on lanthanide-functionalized MOF for Hg2+ detection

Post-synthesis modification is an effective strategy for the preparation of rare earth organic framework materials and the derivation of high-performance functional materials. Here, we report the preparation of a dual emission Ln-MOF material (Eu-Ca-MOF) using Ca-MOF as the parent framework and introducing Eu3+ ions into its channels through post-synthesis modification. Eu-Ca-MOF has good photoluminescence properties and can be used as a ratiometric fluorescence sensor (I381/I590) to detect Hg2+ ions in water sensitively. The characteristic of Eu-Ca-MOF obtained is that when the material is dispersed in an aqueous solution containing Hg2+ ions, the characteristic emission of the ligand at 381 nm is enhanced, while the characteristic emission of Eu3+ at 590 nm is quenched. The peak-to-height ratio of the two emissions can be used to achieve highly sensitive detection of Hg2+ ions even in the presence of other potentially competing analytes. In addition, Hg2+ induces Eu-Ca-MOF to produce a significant ratiometric luminescence response, which changes its luminescence color from red to blue, which is beneficial to visual analysis of naked eyes. At the same time, Eu-Ca-MOF has a wider detection range (0.02–200 μM), and a lower limit detection (2.6 nM) for Hg2+ ions. The lanthanide compounds prepared by post-synthetic modification provide an effective synthesis strategy for photoluminescent materials.

更新日期：2022-06-30

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