研究目的
To synthesize water-stable luminescent metal-organic frameworks (MOFs) for selective sensing of Fe3+ ions and nitroaromatic explosives, and to investigate their stimuli-responsive luminescence upon lanthanide encapsulation.
研究成果
The synthesized MOFs exhibit high selectivity and sensitivity for detecting Fe3+ ions and nitroaromatic explosives, with significant luminescence quenching. Encapsulation of lanthanide ions leads to enhanced and shifted luminescence, making these materials promising for environmental monitoring and security applications.
研究不足
The study is limited to specific MOF structures and may not generalize to other systems. The sensing performance could be affected by environmental factors, and the encapsulation efficiency for lanthanides might vary with different ions.
1：Experimental Design and Method Selection:
The study involved synthesizing three MOFs using solvent control methods, with characterization via single-crystal X-ray diffraction, powder X-ray diffraction, thermogravimetric analysis, and photoluminescence spectroscopy to assess structural and luminescent properties.
2：Sample Selection and Data Sources:
MOFs were synthesized from biphenyl-3,3',5,5'-tetracarboxylic acid (H4bptc) and metal salts (Zn or Cd nitrates) in various solvent mixtures. Sensing experiments used analytes like Fe3+ ions and nitroaromatic compounds in solution.
3：List of Experimental Equipment and Materials:
Equipment included a vario MICRO cube elemental analyzer, JASCO FP-6500 Fluorescence Spectrophotometer, NETZSCH STA 449F5 thermal analyzer, PANalytical Empyrean X-ray diffractometer, and Bruker D8 Venture diffractometer. Materials included H4bptc, metal salts, solvents (DMF, NMP, DMA, water), and analytes.
4：Experimental Procedures and Operational Workflow:
Synthesis involved heating mixtures at 85°C for 24 hours, cooling, filtering, and washing crystals. Luminescence measurements were performed on solid samples and suspensions in solvents, with titration of analytes to observe quenching or enhancement effects.
5：Data Analysis Methods:
Data were analyzed using Stern-Volmer equations for quenching constants, and structural data were refined with SHELX programs.
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