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

Abstract

A novel Sm-metal–organic framework (MOF) sensor with the molecular formula Sm 8 (HDBA) 6 ·H 2 O has been prepared based on a penta-carboxyl organic ligand (H 5 DBA = 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 H 5 DBA 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, MnO 4 – 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.

A Tetraphenylethene‐Based Aggregation‐Induced Emission Luminogen (AIEgen) With Mechanochromic Phenomena for Highly Selective Naked‐Eye Detection of Mno4− Directly in Aqueous Media

“…As a result, we report a previously described TPEgen chemosensor for the selective and sensitive detection of MnO 4 − over other anions in a mixed aqueous medium (ACN: H 2 O: 1 : 9, v/v). The detection of this chemosensor for MnO 4 − is entirely dependent on the fluorescence “switch‐off” type, in contrast to previously described chemosensors [15,16] …”

“…À is entirely dependent on the fluorescence "switch-off" type, in contrast to previously described chemosensors. [15,16]…”

Construction of Two-Dimensional Fluorescent Covalent Organic Framework Nanosheets for the Detection and Removal of Nitrophenols

“…At present, various methods including high-performance liquid chromatography, colorimetry, fluorescence quenching, and electrochemical reduction have been developed to realize the detection of NACs. Among them, the fluorescence method is favored because of its simple operation, high sensitivity, strong practicability, and good accuracy.…”

Manganese Cyclotriphosphazene Multicarboxylate Frameworks and Composite Encapsulated 1,3,6,8-Tetrakis(p-benzoic acid) Pyrene as Visualization of Highly Selective Fluorescence Sensors for Aromatic Compounds with NH2/NO2 Group

“…In addition, nitroaromatic complexs (NACs) are important chemically energetic compounds, which can be used to produce insecticides, explosives, clothing dyes, shoe polish, and other substances. − Among them, p -nitrobenzoic acid and o -nitrophenol can easily cause environmental pollution and are explosion hazards . Therefore, the trace detection of p -nitrobenzoic acid and o -nitrophenol is essential for environmental governance and ensuring social security . So far, many analytical methods have been explored in many applications, including high-performance liquid chromatography, electrochemistry, capillary electrophoresis, mass spectrometry, and colorimetry.…”

“…10 Therefore, the trace detection of p-nitrobenzoic acid and onitrophenol is essential for environmental governance and ensuring social security. 11 So far, many analytical methods have been explored in many applications, including high-performance liquid chromatography, electrochemistry, capillary elec-trophoresis, mass spectrometry, and colorimetry. However, equipment, complicated sample pretreatment, and timeconsuming processes need to be considered, and the aforementioned techniques used are relatively expensive.…”