Wavelength-Controlled Light-Responsive Polymer Vesicle Based on Se-S Dynamic Chemistry.

Area of Science:

• Polymer Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Dynamic covalent chemistry offers tunable control over material properties.
• Selenium-sulfur (Se-S) bonds provide a novel dynamic covalent linkage for responsive materials.
• Self-assembled polymer structures, like vesicles, are promising for various applications.

Purpose of the Study:

• To synthesize an asymmetric polymeric amphiphile featuring a Se-S bond.
• To investigate the light-induced self-assembly and disassembly of these polymers into vesicles.
• To explore the mechanism of wavelength-controlled degradation of polymer vesicles.

Main Methods:

• Synthesis of an asymmetric polymeric amphiphile with a Se-S bond.
• Induction of self-assembly into vesicles in an aqueous solution.
• Application of visible light and toluene to trigger vesicle rupture.
• Characterization using Nuclear Magnetic Resonance (NMR), Gel Permeation Chromatography (GPC), and X-ray Photoelectron Spectroscopy (XPS).

Main Results:

• Successful synthesis and self-assembly of polymer vesicles containing Se-S bonds.
• Demonstration of wavelength-controlled vesicle rupture upon visible light irradiation in the presence of toluene.
• Confirmation of Se-S bond cleavage as the mechanism for vesicle dissociation.
• Evidence of polymer assembly dissociation following Se-S bond fracture.

Conclusions:

• Introduction of Se-S dynamic chemistry enables wavelength-controlled light responses in polymer assemblies.
• The Se-S bond acts as a cleavable linker, facilitating the disassembly of self-assembled vesicles.
• This work expands the scope of light-responsive polymer systems with potential for future applications.