研究目的
To synthesize a new tetraphenylethylene (TPE) functionalized 1,4-dihydropyrrolo[3,2-b]pyrrole derivative (APPTPECN) with obvious aggregation-induced emission (AIE) activity and investigate its reversible mechano?uorochromic (MFC) behavior for potential applications in rewritable data storage and the design of smart luminescent materials.
研究成果
The study successfully synthesized a novel 1,4-dihydropyrrolo[3,2-b]pyrrole derivative (APPTPECN) with TPE unit, exhibiting obvious AIE activity and reversible MFC behavior. The MFC mechanism was attributed to a phase transformation between microcrystalline and amorphous states under mechanical force. The compound shows potential for applications in rewritable data storage and the design of smart luminescent materials. The findings provide valuable insights for designing new AIE MFC materials with desired properties.
研究不足
The study was unable to successfully cultivate crystals of the material to explain the phenomenon of fluorescence enhancement after grinding, which limits the understanding of the molecular packing modes and the exact mechanism of MFC behavior.
1：Experimental Design and Method Selection:
The synthesis of APPTPECN was carried out using a simple synthetic method involving a classical Knoevenagel condensation reaction. The compound's AIE activity and MFC behavior were investigated through UV-vis absorption and FL spectra, PXRD, SEM, and DSC analyses.
2：Sample Selection and Data Sources:
The compound APPTPECN was synthesized and its properties were studied in solid state and in DMF/water mixtures with different water volume fractions.
3：List of Experimental Equipment and Materials:
Chemicals and solvents were purchased from Darui of Shanghai. Instruments included a Bruker Avance for 1H NMR, TU-1901 spectrometer for UV-vis absorption spectra, Hitachi FL-7000 for fluorescence spectra, HORIBA FluoroMax-4 spectrofluorometer for absolute solid-state fluorescence quantum yield, MXP18AHF for PXRD patterns, TGA5500 for thermogravimetry analysis, and DSC apparatus for differential scanning calorimetry.
4：Experimental Procedures and Operational Workflow:
The synthesis involved heating and stirring specific reactants in solvents, followed by purification. The AIE activity was checked by observing changes in UV-vis absorption and FL spectra with increasing water fraction in DMF/water mixtures. MFC behavior was studied by grinding the compound and observing changes in fluorescence.
5：Data Analysis Methods:
The data were analyzed to understand the AIE and MFC mechanisms, with PXRD and SEM used to study phase transformations.
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