Wen Xue, Zhang Wenjun, Ding Cong, Li Zhongfa, Xin Chengyue
School of Chemical Engineering, Hebei University of Technology, Tianjin, 300130, China.
Dalton Trans. 2023 Aug 1;52(30):10584-10593. doi: 10.1039/d3dt01590d.
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 Eu/DUT-52-COOH composite is prepared based on the luminescent DUT-52 prototype structure a dual-ligand strategy and a post-synthetic modification (PSM) method. The functionalized Eu/DUT-52-COOH material exhibits dual emission and good photothermal stability in aqueous media. Thus, Eu/DUT-52-COOH is developed as a ratiometric luminescent sensor to achieve highly selective and sensitive detection of Cu and CrO 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 Cu and CrO 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 Cu and CrO.
金属有机框架材料（MOFs）是一类独特的多功能杂化晶体，已成功应用于各种不同的领域。然而，由于MOFs易于在水中降解，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，基于发光的DUT-52原型结构、双配体策略和后合成修饰（PSM）方法，制备了一种新型的双配体Eu/DUT-52-COOH复合材料。功能化的Eu/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/DUT-52-COOH被开发为一种比率发光传感器，用于实现对水溶液中Cu和CrO的高选择性和灵敏检测，其检测限分别低至3.43 μM和25.7 nM。这项工作是基于DUT-52在水介质中检测Cu和CrO的少数案例之一，并且无需使用复杂的分析仪器，仅凭肉眼就能观察到检测信号。详细讨论了可能的传感机制。该项目获得的结果可能为开发智能传感系统以实现对Cu和CrO的高效、易操作和定量智能识别提供广阔前景。
