研究目的
Investigating metal ion induced single-crystal-to-single-crystal transformation and luminescent sensing properties of resorcinarene-based metal-organic frameworks.
研究成果
Two new MOFs were synthesized and characterized. A SCSC transformation was achieved via metal ion exchange, leading to a new Cu-MOF. The MOFs exhibit highly sensitive and selective luminescent detection for Fe3+ and Cr2O7 2- ions, demonstrating their potential as efficient sensors.
研究不足
The SCSC transformation is specific to certain metal ions and may not be generalizable. Luminescent sensing might be affected by interference from other ions or environmental conditions. The synthesis conditions are solvothermal, which could limit scalability.
1：Experimental Design and Method Selection:
The study involved synthesizing two MOFs (1-Zn and 2-Cd) under solvothermal conditions using a resorcin[4]arene-based ligand. Metal ion exchange was performed by immersing crystals in aqueous Cu2+ solutions to induce SCSC transformation. Luminescent properties were measured for sensing applications.
2：Sample Selection and Data Sources:
Crystals of 1-Zn and 2-Cd were used as samples. Metal ion solutions (e.g., CuCl2·2H2O, Fe3+, Cr2O7 2-) were prepared in specific concentrations.
3：List of Experimental Equipment and Materials:
Equipment includes single crystal X-ray diffractometer, ICP analyzer, luminescence spectrometer, thermogravimetric analyzer, elemental analyzer, and optical microscope. Materials include Zn(NO3)2·6H2O, CdCl2·
4：5H2O, CuCl2·2H2O, DMF, water, and various metal salts for sensing. Experimental Procedures and Operational Workflow:
Synthesis of MOFs via solvothermal methods. Immersion of crystals in metal ion solutions for exchange. Monitoring color changes and luminescence quenching over time. Single crystal X-ray diffraction to determine structures. ICP analysis for metal composition. Luminescent measurements for sensing Fe3+ and Cr2O7 2- ions.
5：Data Analysis Methods:
Structural analysis using X-ray crystallography. Metal composition analysis using ICP. Luminescence data analyzed with Stern-Volmer equation for quenching constants. Statistical fitting of decay curves with exponential functions.
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SQUEEZE function
PLATON
Applied during refinement to handle highly disordered solvents in crystal structure analysis.
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single crystal X-ray diffractometer
Used for determining crystal structures of MOFs.
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ICP analyzer
Employed to determine metal composition in exchanged samples.
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luminescence spectrometer
Measured solid-state luminescent behaviors and sensing properties.
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thermogravimetric analyzer
Used for thermogravimetric analysis to suggest presence of water molecules and cations.
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elemental analyzer
Performed elemental analysis to confirm chemical compositions.
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optical microscope
Used for optical microscopic examination of crystal samples.
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