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Caged AIEgens: Multicolor and White Emission Triggered by Mechanical Activation.
Yunyan Sun1,2, Kecheng Wang1,2, Xiao Huang3
1Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States.
Journal of the American Chemical Society
|September 22, 2024
Summary
Researchers developed a new mechanochemical uncaging method to create tunable aggregation-induced emission luminogens (AIEgens). This strategy uses norborn-2-en-7-one (NEO) mechanophores for advanced mechanoresponsive materials.
Area of Science:
- Materials Science
- Polymer Chemistry
- Supramolecular Chemistry
Background:
- Aggregation-induced emission luminogens (AIEgens) are crucial for mechanoresponsive applications.
- Existing AIEgens primarily rely on physical changes in aggregation states.
- Mechanisms involving covalent bond cleavage for AIEgen modulation are limited.
Purpose of the Study:
- To develop a novel mechanochemical uncaging strategy for AIEgens.
- To engineer norborn-2-en-7-one (NEO) mechanophores for tunable fluorescence.
- To explore multicolor mechanofluorescence and continuous color evolution.
Main Methods:
- Covalent integration of NEO mechanophores into polymer molecules.
- Activation of NEO mechanophores in solution and solid states.
- Utilizing Förster resonance energy transfer (FRET) with donor-acceptor pairs.
- Computational exploration of electronic structures of activated NEOs.
Main Results:
- Achieved tunable fluorescence (blue, green, yellow, orange-red) upon NEO activation and immobilization.
- Demonstrated multicolor mechanofluorescence, including white emission, via FRET design.
- Provided insights into regiochemical effects through computational analysis.
- Developed a highly tunable reporter with continuous color evolution.
Conclusions:
- The novel mechanochemical uncaging strategy offers a versatile platform for mechanoresponsive AIEgens.
- Engineered NEO mechanophores enable precise control over emission characteristics.
- This advancement holds promise for applications in damage detection and bioimaging.
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