Supramolecular Nanoparticles via Single-Chain Folding Driven by Ferrous Ions

Area of Science:

• Polymer Chemistry
• Supramolecular Chemistry
• Nanotechnology

Background:

• Single-chain nanoparticles (SCNPs) are synthesized through intramolecular crosslinking, mimicking biomacromolecular behavior.
• Polymer folding is a key strategy for creating functional nanostructures.

Purpose of the Study:

• To synthesize poly(N-hydroxyethylacrylamide-co-4'-(propoxy urethane ethyl acrylate)-2,2':6',2''-terpyridine) (P(HEAm-co-EMA-Tpy)) via reversible addition fragmentation chain transfer polymerization.
• To achieve single-chain folding and intramolecular crosslinking of P(HEAm-co-EMA-Tpy) using metal coordination chemistry.
• To investigate the role of Fe(2+) in supramolecular crosslinking for nanoparticle formation and control.

Main Methods:

• Reversible addition fragmentation chain transfer (RAFT) polymerization for polymer synthesis.
• Metal coordination chemistry (Fe(2+)) for inducing single-chain folding and crosslinking.
• Characterization using UV-vis spectroscopy, 1H NMR, DSC, DLS, TEM, and AFM.

Main Results:

• P(HEAm-co-EMA-Tpy) was successfully synthesized.
• Fe(2+)-mediated supramolecular crosslinking induced intramolecular collapsing and nanoparticle formation.
• Nanoparticle size and morphology were reversibly controlled through metal coordination.

Conclusions:

• Metal coordination chemistry provides an effective route for reversible single-chain folding and nanoparticle formation.
• The synthesized polymer and methodology offer a controllable approach to SCNP fabrication.
• This method holds potential for mimicking biomacromolecules and developing advanced nanomaterials.