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Summary

Tetraquinoxaline cavitands (QxCav) can act as molecular grippers, switching between open and closed states. Mechanical force, particularly within rigid polymer matrices, effectively triggers this conformational change for advanced materials.

Keywords:
cavitandsconformational mechanophoresmolecular gripperspolydimethylsiloxanepolyurethane

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Tetraquinoxaline cavitands (QxCav) exhibit conformational flexibility between closed (vase) and open (kite) states.
  • This conformational switching is typically induced by solution-based stimuli such as pH, temperature, and ion concentration.
  • The potential of QxCav as molecular grippers is linked to their controllable shape-shifting capabilities.

Purpose of the Study:

  • To investigate the mechanochemical conformational switching of functionalized QxCav.
  • To explore the influence of polymer matrix rigidity on QxCav mechanical response.
  • To assess the effectiveness of covalent embedding in converting mechanical force into molecular conformational changes.

Main Methods:

  • Covalent embedding of ad hoc functionalized QxCav into elastomeric polydimethylsiloxane (PDMS) and rigid polyurethane (PU) matrices.
  • Application of mechanical force to the polymer-matrix-QxCav composites.
  • Analysis of QxCav conformational changes in response to applied mechanical stress.

Main Results:

  • Mechanochemical conformational switching of QxCav was successfully achieved within polymer matrices.
  • A rigid polyurethane matrix demonstrated higher efficacy in converting mechanical force into QxCav conformational switching compared to an elastomeric PDMS matrix.
  • Complete covalent connection of all four quinoxaline wings to the rigid polymer matrix enhanced the mechanochemical response.

Conclusions:

  • Rigid polymer matrices are superior for translating macroscopic mechanical force into molecular-level conformational changes of embedded QxCav.
  • The covalent linkage of QxCav to the polymer backbone is crucial for efficient mechanochemical actuation.
  • This study highlights the potential of QxCav as mechanochemically responsive components in advanced materials.