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Rotaxanes as Mechanochromic Fluorescent Force Transducers in Polymers.

Yoshimitsu SagaraMarc KarmanEster Verde-SestoKazuya MatsuoYuna KimNobuyuki TamaokiChristoph Weder
Published in: Journal of the American Chemical Society (2018)
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 mechanophore 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.
Keyphrases
  • single molecule
  • living cells
  • fluorescent probe
  • high resolution
  • quantum dots
  • high speed
  • liquid chromatography
  • sensitive detection
  • energy transfer
  • tissue engineering
  • label free