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Internal Dynamics and Modular Peripheral Binding in Stimuli-Responsive 3 : 2 Host:Guest Complexes.

Hang Yin1, Roselyne Rosas2, Stéphane Viel3,4

  • 1State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Taipa, Macau, China.

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|November 27, 2023
PubMed
Summary
This summary is machine-generated.

Researchers explored higher stoichiometry host:guest complexes using cucurbit[n]uril (CB[n]) macrocycles and di-viologens. They discovered unique 3:2 CB[8] complexes with dynamic properties and responsiveness to stimuli.

Keywords:
ComplexesCucurbiturilStimulusSupramolecularViologen

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Area of Science:

  • Supramolecular Chemistry
  • Macrocyclic Chemistry
  • Host:Guest Chemistry

Background:

  • The chemistry of 1:1 host:guest complexes is well-established.
  • Higher stoichiometry (oligomeric) complexes, particularly with excess host, are largely unexplored.
  • Protein oligomerization leads to novel functions in cellular machinery.

Purpose of the Study:

  • To investigate the formation and properties of higher stoichiometry host:guest complexes.
  • To explore the potential of cucurbit[n]uril (CB[n]) macrocycles in forming such complexes.
  • To understand the dynamic and responsive behaviors of these novel supramolecular assemblies.

Main Methods:

  • Synthesis and characterization of host:guest complexes using cucurbit[n]uril (CB[n]) macrocycles and symmetric, linear di-viologens.
  • Investigation of complex stoichiometry, structural dynamics, and self-sorting properties in aqueous solutions.
  • Evaluation of the responsiveness of the complexes to various external stimuli including chemicals, pH, and redox conditions.

Main Results:

  • Formation of unusual 3:2 host:guest complexes between CB[n] macrocycles and di-viologens.
  • Observation of remarkable dynamic properties, including host self-sorting and external ring-translocation.
  • Demonstration of the structural tunability of cucurbit[8]uril (CB[8]) based 3:2 complexes.
  • Confirmation of the complexes' responsiveness to chemical, pH, and redox stimuli in water.

Conclusions:

  • Cucurbit[n]uril macrocycles can form higher stoichiometry, oligomeric host:guest complexes.
  • The discovered 3:2 CB[8]:di-viologen complexes exhibit unique dynamic and responsive characteristics.
  • These findings expand the understanding of supramolecular complex formation and highlight potential applications in stimulus-responsive materials.