一种新型双配体 DUT-52 型金属有机框架，用于水相 Cu2+ 和 Cr2O72− 的比率发光检测,Dalton Transactions

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一种新型双配体 DUT-52 型金属有机框架，用于水相 Cu2+ 和 Cr2O72− 的比率发光检测
Dalton Transactions ( IF 3.5 ) Pub Date : 2023-07-17 , DOI: 10.1039/d3dt01590d
Xue Wen ₁ , Wenjun Zhang ₁ , Cong Ding ₁ , Zhongfa Li ₁ , Chengyue Xin ₁

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金属有机框架（MOF）是一类独特的多功能杂化晶体，已成功应用于多种应用。然而，由于MOF很容易发生水降解，因此在水介质中开发稳定的发光MOF平台仍然是一个巨大的挑战。在此，基于发光DUT-52原型结构，通过双配体策略和合成后修饰（PSM）方法制备了新型双配体Eu ^{3+ /DUT-52-COOH复合材料。}功能化的Eu ³⁺ /DUT-52-COOH材料在水介质中表现出双重发射和良好的光热稳定性。因此，Eu ³⁺ /DUT-52-COOH被开发为比率发光传感器，可实现水溶液中Cu ²⁺和Cr ₂ O ₇²⁻的高选择性和灵敏检测，并具有3.43 μM和25.7 μM的低检测限。分别为nM。该工作是基于DUT-52检测水介质中Cu 2+^和Cr ₂ O ₇²⁻的少数案例之一，并且无需使用复杂的分析仪器即可通过肉眼观察检测信号。详细讨论了可能的传感机制。本项目取得的成果为开发智能传感系统实现高效、易操作、定量的Cu ²⁺和Cr ₂ O ₇²⁻智能识别提供了广阔的前景。

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A new dual-ligand DUT-52-type metal–organic framework for ratiometric luminescence detection of aqueous-phase Cu2+ and Cr2O72−

Metal–organic frameworks (MOFs) are a unique class of multifunctional hybrid crystals that have been successfully utilized in diverse ranges of applications. However, since MOFs are prone to aqueous degradation, the development of stable luminescent MOF platforms in aqueous media is still a huge challenge. Here, a novel dual-ligand Eu³⁺/DUT-52-COOH composite is prepared based on the luminescent DUT-52 prototype structure via a dual-ligand strategy and a post-synthetic modification (PSM) method. The functionalized Eu³⁺/DUT-52-COOH material exhibits dual emission and good photothermal stability in aqueous media. Thus, Eu³⁺/DUT-52-COOH is developed as a ratiometric luminescent sensor to achieve highly selective and sensitive detection of Cu²⁺ and Cr₂O₇²⁻ in aqueous solutions and has a low detection limit of 3.43 μM and 25.7 nM, respectively. This work is one of the few cases of detecting Cu²⁺ and Cr₂O₇²⁻ in aqueous media based on a DUT-52, and the detection signals can be observed by the bare eye without using sophisticated analytical instruments. The possible sensing mechanism is discussed in detail. The results obtained in this project may provide broad prospects for developing smart sensing systems to accomplish highly efficient, easily operable and quantitative intelligent recognition of Cu²⁺ and Cr₂O₇²⁻.

更新日期：2023-07-17

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