研究目的
To mobilize all components of a lanthanide-viologen metal–organic framework (MOF) to collaboratively achieve multiple responsive properties, including reversible photochromism, piezochromism, hydrochromism, ionochromism, and luminescence modulation, through electron transfer, charge transfer, and energy transfer mechanisms.
研究成果
The LVMOF-1 exhibits versatile and switchable responsive properties due to collaborative involvement of all components in ET, CT, and EnT processes. It demonstrates potential applications in sensors, logic gates, and iodide detection, with excellent reversibility and stability. Future work could explore extended systems and deeper mechanistic insights.
研究不足
The study is limited to specific anions and stimuli; the framework's stability under extreme conditions and scalability for practical applications may require further optimization. The mechanisms rely on specific electron donor-acceptor pairs, which might not be generalizable to other systems.
1：Experimental Design and Method Selection:
The study involved synthesizing LVMOF-1 with various anions (e.g., Cl?, Br?, I?, PF6?, ClO4?) and investigating their responses to stimuli like light, pressure, water, and anion exchange. Methods included UV–vis spectroscopy, ESR spectroscopy, XPS, PXRD, in situ high-pressure spectroscopy using DAC, luminescence measurements, and single-crystal X-ray crystallography.
2：Sample Selection and Data Sources:
Samples were synthesized using literature procedures, with anion exchange performed in aqueous solutions. Data were collected from spectroscopic and crystallographic analyses.
3：List of Experimental Equipment and Materials:
Equipment included a 300 W Xe lamp for photoirradiation, hydraulic press for compression, DAC for high-pressure studies, Ocean Optics QE65000 spectrometer, Renishaw 1000 spectrometer, and various analytical instruments for characterization. Materials included reagents like Eu(III) salts, viologen ligands, and solvents.
4：Experimental Procedures and Operational Workflow:
Procedures involved synthesizing MOFs, performing anion exchange, subjecting samples to stimuli (e.g., heating for dehydration, light irradiation, pressure application), and measuring changes in color, absorption, ESR signals, and luminescence. High-pressure experiments used DAC with silicone oil as pressure-transmitting medium.
5：Data Analysis Methods:
Data were analyzed using linear Stern–Volmer equations for luminescence quenching, Mulliken dependence for CT interactions, and fitting curves for pressure-dependent changes.
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