Circularly Polarized Luminescence from a Pyrene-Cyclodextrin Supra-Dendron

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Chiroptical Materials

Background:

• Soft nanomaterials with circularly polarized luminescence (CPL) are gaining significant attention.
• Pyrene-containing peptide dendrons offer a versatile platform for developing novel CPL materials.

Purpose of the Study:

• To synthesize and characterize pyrene-containing π-peptide dendron hydrogels.
• To investigate the self-assembly behavior and CPL properties of these dendrons.
• To explore the influence of host-guest interactions with cyclodextrins on nanostructure and CPL.

Main Methods:

• Hydrogel formation across a wide pH range.
• pH-tuned helical self-assembly of dendrons.
• Chirality transfer from peptide to pyrene moiety for CPL.
• Host-guest complexation with β- and γ-cyclodextrins.
• Characterization of supra-dendrons and their CPL emission.

Main Results:

• Dendron hydrogels formed stable 1D helical nanostructures with pH-tunable pitches.
• Pyrene units exhibited CPL from both monomer and excimer bands.
• Cyclodextrin complexation induced distinct 2D nanostructures (nanosheets and nanofibers).
• Supra-dendrons displayed cyclodextrin-modulated CPL from pyrene moieties.

Conclusions:

• Simple host-guest interactions effectively modulate both nanostructures and chiroptical properties of pyrene-peptide dendrons.
• This provides a facile strategy for designing advanced CPL soft materials.
• The study highlights the potential of supramolecular chemistry in creating functional nanomaterials.