Novel Multifunctional Samarium–Organic Framework for Fluorescence Sensing of Ag+, MnO4–, and Cimetidine and Electrochemical Sensing of o‑Nitrophenol in Aqueous Solutions

A novel Sm-metal–organic framework (MOF) sensor with the molecular formula Sm8(HDBA)6·H2O has been prepared based on a penta-carboxyl organic ligand (H5DBA = 3,5-di­(2′,4′-dicarboxylphenyl)­benzoic acid) and samarium nitrate under solvothermal conditions. Sm-MOF is characterized by single-crystal X-ray diffraction analysis, elemental analysis, thermogravimetric analysis, and powder X-ray diffraction analysis. Structural analysis shows that the dimer metal units are alternately connected to form a one-dimensional chain, and this chain is connected by the bridging carboxyl oxygen of the ligand H5DBA to form a two-dimensional double-layer plane, which then expands into a three-dimensional microporous framework. Fluorescence detection studies show that Sm-MOF can detect Ag+ ions, MnO4– anions, and cimetidine tablets with high sensitivity and selectivity and can also be used to electrochemically detect o-nitrophenol in water. High-sensitivity detection capability of the Sm-MOF can enrich the application of samarium complexes in multifunctional sensors.基于五羧基有机配体H5DBA（H5DBA=3,5-二(2′,4′-二羧基苯基)苯甲酸）与硝酸钐，通过溶剂热法制备了一种新型钐基金属有机框架（metal-organic framework, MOF）传感器，其分子式为Sm8(HDBA)6·H2O。随后通过单晶X射线衍射分析、元素分析、热重分析以及粉末X射线衍射分析对该Sm-MOF进行了表征。结构分析表明，双核金属单元交替连接形成一维链，该链通过配体H5DBA的桥联羧基氧相互连接，构筑为二维双层平面，进而拓展为三维微孔骨架。荧光检测研究显示，该Sm-MOF可高灵敏度、高选择性地检测Ag+离子、MnO4–阴离子以及西咪替丁片剂，同时还可用于电化学检测水中的邻硝基苯酚。该Sm-MOF的高灵敏检测性能，可丰富钐基配合物在多功能传感器领域的应用。