Fluorescent supramolecular mechanophores based on charge-transfer interactions
Keiichi Imato1, Ryota Yamanaka, Hidekazu Nakajima
1Department of Life Science and Medical Bioscience, Graduate School of Advanced Science and Engineering, Waseda University (TWIns), 2-2 Wakamatsucho, Shinjuku, Tokyo 162-8480, Japan. ntakeda@waseda.jp.
Chemical Communications (Cambridge, England)
|June 13, 2020
Summary
New supramolecular mechanofluorophores utilize charge-transfer interactions for mechanical force sensing. These polymers exhibit quenched fluorescence that turns on when subjected to mechanical stress, enabling force detection.
Area of Science:
- Materials Science
- Polymer Chemistry
- Supramolecular Chemistry
Background:
- Charge-transfer (CT) interactions are crucial for developing responsive materials.
- Mechanofluorophores offer a route to visualize mechanical forces at a molecular level.
- Poly(ε-caprolactone)s are versatile polymers with tunable properties.
Purpose of the Study:
- To develop novel supramolecular mechanofluorophores.
- To investigate the role of intramolecular charge-transfer (CT) interactions in fluorescence quenching and activation.
- To incorporate these mechanofluorophores into a polymer matrix for mechanical sensing applications.
Main Methods:
- Synthesis of supramolecular mechanofluorophores featuring pyrene and naphthalene diimide units in a tandem structure.
- Incorporation of these units into the mid-chain of poly(ε-caprolactone)s.
- Characterization of fluorescence properties in solution and in the polymer matrix under mechanical stress.
Main Results:
- Successfully developed supramolecular mechanofluorophores based on pyrene-naphthalene diimide CT interactions.
- Demonstrated fluorescence quenching due to intramolecular CT interactions in both solution and polymer.
- Observed a significant turn-on fluorescence response upon the application of mechanical forces.
Conclusions:
- The developed supramolecular mechanofluorophores effectively translate mechanical force into a detectable fluorescence signal.
- Intramolecular CT interactions play a key role in the mechanoresponsive behavior of these materials.
- These findings open avenues for designing advanced force-sensing polymers.
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