Chiral Semibuckminsterfullerene: Synthesis, Resolution, and Chiroptical Properties

Area of Science:

• Organic Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Fullerenes and buckybowls are unique carbon nanomaterials with intriguing electronic and optical properties.
• Chiral semifullerenes offer potential for stereoselective applications but are challenging to synthesize.
• Developing scalable synthetic routes is crucial for exploring their practical utility.

Purpose of the Study:

• To establish a gram-scalable synthesis of C30-buckybowls and their derivatives.
• To report the first successful desymmetrization of a buckybowl to a chiral semifullerene.
• To characterize the chiroptical and electronic properties of the synthesized chiral compounds.

Main Methods:

• Optimization of a synthetic route for gram-scale production of buckybowl precursors.
• Development of a novel desymmetrization strategy to access chiral semifullerenes.
• Experimental and theoretical determination of chiroptical (e.g., circular dichroism) and electronic properties.

Main Results:

• Successful gram-scale synthesis of C30-buckybowl precursor 1 and derivative 2.
• Demonstration of the first desymmetrization yielding a stable chiral semifullerene.
• Comprehensive characterization of the synthesized compounds' unique properties.

Conclusions:

• The developed process allows for practical, gram-scale production of valuable buckybowls and chiral semifullerenes.
• Chiral hemifullerenes represent promising scaffolds for stereoselective ligands, receptors, sensors, and catalysts.
• These findings pave the way for the development of new advanced materials based on curved aromatic systems.