A Saddle-Shaped Expanded Porphyrinoid Fitting C₆₀

Area of Science:

• Supramolecular Chemistry
• Organic Synthesis
• Materials Science

Background:

• Expanded porphyrinoids are macrocyclic compounds with unique electronic and structural properties.
• Host-guest chemistry involving fullerenes is crucial for developing advanced materials.
• Developing efficient synthetic routes for complex macrocycles remains a challenge.

Purpose of the Study:

• To synthesize a novel expanded porphyrinoid macrocycle with a saddle-shaped geometry.
• To investigate the complexation of C60 guest molecules by the new macrocycle.
• To characterize the photophysical properties and host-guest interactions of the system.

Main Methods:

• Copper-catalyzed click reaction for macrocycle synthesis.
• Nuclear Magnetic Resonance (NMR) spectroscopy for solution-state analysis.
• X-ray crystallography for solid-state structure determination.

Main Results:

• Successful synthesis of a saddle-shaped macrocycle containing carbazole and triazole units.
• Demonstration of efficient host-guest complexation with C60 molecules.
• Observation of stacked polymer formation in host-guest complexes.
• High fluorescence quantum yield (60%) of the macrocycle.

Conclusions:

• The novel saddle-shaped macrocycle is readily synthesized and exhibits promising photophysical properties.
• The unique geometry facilitates host-guest interactions with C60, leading to polymer formation.
• This work opens avenues for designing new supramolecular architectures for materials applications.