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Photoactive foldamers with anthracene motifs form helical assemblies that bind molecular threads. Light causes dissociation and thread release, while heat reforms the structure, enabling controllable molecular sequestration.

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Area of Science:

  • Supramolecular Chemistry
  • Photochemistry
  • Polymer Science

Background:

  • Foldamers are polymers that adopt defined structures.
  • Anthracene motifs can be incorporated into molecular structures to impart photoresponsive properties.
  • Supramolecular assemblies involve non-covalent interactions to create larger structures.

Purpose of the Study:

  • To develop photoactive foldamers capable of molecular sequestration.
  • To investigate the light-induced dissociation of supramolecular assemblies.
  • To explore the reversibility of these photoresponsive systems.

Main Methods:

  • Synthesis of aromatic oligoamide foldamers incorporating multiple anthracene units.
  • Formation of helix-on-axle supramolecular assemblies with a molecular thread.
  • Photoirradiation studies to induce and monitor assembly dissociation.
  • Thermal treatment to induce assembly regeneration.

Main Results:

  • Successfully integrated anthracene motifs into oligoamide foldamers, creating photoactive materials.
  • Demonstrated the ability of these foldamers to sequester a molecular thread within a helical structure.
  • Showed that photoirradiation distorts the helical foldamer, leading to dissociation and thread liberation.
  • Confirmed that thermal reversion regenerates the supramolecular assembly and re-sequesters the thread.

Conclusions:

  • Photoactive foldamers offer a controllable mechanism for molecular sequestration and release.
  • Light-induced dissociation and thermal regeneration provide a reversible system for molecular handling.
  • These findings open avenues for developing light-responsive materials for molecular recognition and delivery.