Redox-switchable supramolecular graft polymer formation via ferrocene-cyclodextrin assembly

Area of Science:

• Polymer Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Host-guest interactions are crucial for creating dynamic and responsive materials.
• Ferrocene (Fc) and cyclodextrin (CD) are well-established host-guest pair systems.
• Controlled polymerization techniques are essential for synthesizing well-defined polymer architectures.

Purpose of the Study:

• To synthesize redox-switchable supramolecular graft polymers in aqueous solution.
• To investigate the self-assembly behavior of these polymers driven by host-guest interactions.
• To characterize the structural and redox properties of the resulting supramolecular structures.

Main Methods:

• Reversible Addition-Fragmentation chain Transfer (RAFT) copolymerization to synthesize Fc-containing polymers (PDMA-stat-Fc).
• RAFT polymerization followed by copper (I)-catalyzed 1,3-cycloaddition to create β-cyclodextrin (β-CD) functionalized polymers (PDEA-βCD).
• Nuclear Overhauser Enhancement Spectroscopy (NOESY), Cyclic Voltammetry (CV), and Transmission Electron Microscopy (TEM) for characterization.

Main Results:

• Well-defined graft polymers with controlled Fc content and molecular mass were successfully synthesized.
• Host-guest interactions between Fc and β-CD moieties led to the formation of supramolecular graft polymers.
• The polymers exhibited redox-responsive behavior, confirmed by CV.
• Self-assembly in aqueous solution resulted in the formation of mono- and multi-core micelle aggregates, observed via TEM.

Conclusions:

• Redox-switchable supramolecular graft polymers can be effectively constructed in aqueous media using Fc-CD host-guest chemistry.
• The synthesized polymers demonstrate tunable self-assembly into defined nanostructures.
• This approach offers a versatile platform for developing advanced functional materials with responsive properties.