Tunable Macrocyclic Polyparaphenylene Nanolassos via Copper-Free Click Chemistry

Area of Science:

• Organic Chemistry
• Supramolecular Chemistry

Background:

• Synthesizing diverse compound libraries from single precursors is challenging in cycloparaphenylene chemistry.
• Late-stage functionalization offers a route to modify complex molecular architectures.

Purpose of the Study:

• To explore a novel strategy for the late-stage functionalization of alkyne-containing cycloparaphenylenes.
• To investigate the impact of peripheral substitution on the properties of resulting cycloparaphenylene adducts.

Main Methods:

• Copper-free [3+2]azide-alkyne cycloaddition reaction.
• Systematic variation of electron-rich to electron-deficient azides.
• Experimental characterization and theoretical calculations, including AIQM1.

Main Results:

• High yields (>90%) achieved in a single reaction step.
• Demonstrated efficient functionalization of shape-persistent cycloparaphenylenes.
• Observed significant influence of azide substitution on molecular shape, oxidation potential, excited state properties, and fullerene affinity.

Conclusions:

• The developed strategy provides a versatile route for generating diverse cycloparaphenylene derivatives.
• Peripheral substitution plays a crucial role in tuning the optoelectronic and structural properties of these adducts.
• This work advances cycloparaphenylene chemistry and offers new possibilities for materials science.