An Azobenzene-Based Single-Component Supramolecular Polymer Responsive to Multiple Stimuli in Water

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Polymer Chemistry

Background:

• Supramolecular assemblies offer stimulus-responsive properties due to noncovalent interactions, enabling control over size, morphology, and chemical characteristics.
• Designing single-component systems that respond to multiple stimuli independently remains a significant challenge in supramolecular chemistry.

Purpose of the Study:

• To synthesize and characterize a novel discotic molecule capable of forming a single-component supramolecular polymer in water.
• To demonstrate multi-stimuli responsiveness (temperature, light, pH, ionic strength) in a controlled manner within a single supramolecular system.

Main Methods:

• Solid-phase synthesis of a C3-symmetric discotic monomer incorporating an azobenzene moiety, an octaethylene glycol chain, and a C-terminal lysine.
• Characterization using microscopy and spectroscopy techniques to confirm self-assembly in water and analyze multi-stimuli responsiveness.

Main Results:

• Successful self-assembly of the discotic monomer into a supramolecular polymer in aqueous solution.
• Demonstrated independent responsiveness of the supramolecular polymer to temperature, light, pH, and ionic strength.
• Validated the modular design approach for integrating multiple responsive functionalities.

Conclusions:

• The rational design of monomers enables the integration of independent stimuli-responsive mechanisms within a single supramolecular polymer.
• This work highlights the potential of multiresponsive supramolecular systems for advanced applications in aqueous environments.