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Stimuli-Responsive Supramolecular Assemblies Constructed from Pillar[ n]arenes.

Takahiro Kakuta1, Tada-Aki Yamagishi1, Tomoki Ogoshi1,2

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Summary
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Pillar[n]arenes are versatile macrocyclic hosts that enable the creation of stimuli-responsive supramolecular assemblies. These assemblies exhibit controlled size, shape, and function in response to external cues like light, pH, and redox changes.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Supramolecular assemblies rely on noncovalent interactions, offering dynamic and reversible structures.
  • Environmental factors like polarity, temperature, and pressure influence assembly formation and structure.
  • Controlling the size and shape of supramolecular assemblies is crucial for their function.

Purpose of the Study:

  • To explore the development and applications of stimuli-responsive supramolecular assemblies.
  • To highlight the unique properties of pillar[n]arenes as macrocyclic hosts.
  • To review photo-, pH-, and redox-responsive systems based on pillar[n]arenes.

Main Methods:

  • Utilizing pillar[n]arenes as building blocks for supramolecular assembly construction.
  • Investigating molecular-scale assemblies like pseudorotaxanes, pseudocatenanes, and supramolecular polymers.
  • Examining sub-nanometer to micrometer scale assemblies, including particles and vesicles.
  • Analyzing macroscopic stimuli-responsive changes in surfaces and gels.

Main Results:

  • Pillar[n]arenes exhibit unique host ability, chirality, and functionality, distinct from other macrocycles.
  • Demonstrated control over molecular-scale, nanoscale, and microscale supramolecular structures using stimuli.
  • Showcased macroscopic responsive behaviors such as shrinking, expansion, and adhesion.
  • Successfully developed photo-, pH-, and redox-responsive supramolecular assemblies.

Conclusions:

  • Pillar[n]arenes are highly effective macrocyclic hosts for designing advanced stimuli-responsive supramolecular systems.
  • The study provides a comprehensive overview of pillar[n]arene-based assemblies, from molecular to macroscopic scales.
  • This research inspires further innovation in supramolecular chemistry and the development of novel functional materials.