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Rotaxane-Based Mechanochromic Mechanophore Enabled by Amide Bond Formation
Yuto Yoshida1, Yoshimitsu Sagara1,2
1Department of Materials Science and Engineering, Institute of Science Tokyo, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan.
Chemistry, an Asian Journal
|February 27, 2025
Summary
Researchers developed new rotaxane mechanophores using amide bond formation. These supramolecular mechanophores show reversible fluorescence changes in response to mechanical force, enabling broader applications.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Polymer Science
Background:
- Mechanochromic mechanophores change optical properties under mechanical stress.
- Supramolecular mechanophores offer reversible, force-induced fluorescence changes without bond cleavage.
- Existing rotaxane mechanophores often use azide-alkyne cycloaddition, limiting functional group incorporation.
Purpose of the Study:
- To develop a novel synthesis for rotaxane mechanophores.
- To overcome limitations of previous rotaxane synthesis methods.
- To create mechanophores with enhanced functional group compatibility.
Main Methods:
- Synthesized rotaxane mechanophores via amide bond formation.
- Incorporated the mechanophore into polyurethane elastomer films.
- Investigated fluorescence response to mechanical stretching.
Main Results:
- Achieved rapid and reversible on/off switching of green fluorescence.
- Demonstrated force-responsive behavior comparable to existing rotaxane mechanophores.
- Confirmed the utility of amide bond formation for rotaxane synthesis.
Conclusions:
- Amide bond formation provides a versatile route for synthesizing rotaxane mechanophores.
- This strategy allows for diverse functional group incorporation.
- Broadens the potential applications of supramolecular mechanophores.
