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Researchers developed stimuli-responsive supramolecular polymers using benzene-1,3,5-tricarboxamide (BTA) and azobenzene. These polymers can be depolymerized with UV light and regenerated with visible light, showing potential for photo-responsive materials.

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Area of Science:

  • Supramolecular chemistry
  • Polymer science
  • Materials science

Background:

  • Synthetic polymers are increasingly designed to mimic natural self-assembling systems.
  • Benzene-1,3,5-tricarboxamide (BTA) based supramolecular polymers are well-studied for their hydrogen-bonded helical structures.
  • Incorporating photoswitchable units offers external control over polymer assembly and disassembly.

Purpose of the Study:

  • To synthesize and characterize novel stimuli-responsive supramolecular polymers based on BTA and an azobenzene photoswitch.
  • To investigate the depolymerization and regeneration mechanisms triggered by orthogonal light stimuli.
  • To explore the structural behavior of these polymers across a range of concentrations.

Main Methods:

  • Synthesis of BTA derivatives functionalized with azobenzene photoswitches and chiral alkyl chains.
  • UV-Vis spectroscopy and Circular Dichroism (CD) to monitor depolymerization in dilute solutions.
  • Nuclear Magnetic Resonance (NMR) spectroscopy and iPAINT super-resolution microscopy for concentrated solutions.
  • Molecular dynamics (MD) simulations to predict the preferred helical configurations.

Main Results:

  • UV irradiation (365 nm) induced depolymerization of helical BTA polymers in methylcyclohexane (MCH).
  • Regeneration of the polymer superstructure was achieved after thermal depolymerization.
  • Repeated light-induced depolymerization and regeneration cycles were possible without degradation using visible light (455 nm).
  • MD simulations revealed a specific left-handed helical network of BTA cores and right-handed azobenzene helices.

Conclusions:

  • The developed BTA-azobenzene polymers exhibit reversible light-responsive behavior across a broad concentration range.
  • The orthogonal photo-triggers allow for precise control over polymer assembly and disassembly.
  • These findings suggest potential applications in areas such as photo-responsive gelation and advanced materials design.