期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 5, 页码 1584-1587出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b12405
关键词
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资金
- JSPS KAKENHI [JP16H00818]
- Asahi Glass Foundation
- Iketani Science and Technology Foundation
- Ogasawara Foundation for the Promotion of Science and Engineering
- Swiss National Center of Competence in Research Bio-Inspired Materials
- European Research Council [291490-MERESPO]
- Grants-in-Aid for Scientific Research [16H00818] Funding Source: KAKEN
The integration of mechanophores, motifs that transduce mechanical forces into chemical reactions, allows creating materials with stress-dependent properties. Typical mechanophores are activated by cleaving weak covalent bonds, but these reactions can also be triggered by other stimuli, and this renders the behavior unspecific. Here we show that this problem can be overcome by extending the molecular-shuttle function of rotaxanes to mechanical activation. A mechanically interlocked mecha-nophore composed of a fluorophore-carrying macrocycle and a dumbbell-shaped molecule containing a matching quencher was integrated into a polyurethane elastomer. Deformation of this polymer causes a fluorescence turn on, due to the spatial separation of fluorophore and quencher. This process is specific, efficient, instantly reversible, and elicits an easily detectable optical signal that correlates with the applied force.
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