Catching Fullerenes: Synthesis of Molecular Nanogloves

Area of Science:

• Supramolecular Chemistry
• Organic Synthesis
• Materials Science

Background:

• Fullerenes are a class of carbon allotropes with unique electronic and structural properties.
• Efficient methods for fullerene recognition and separation are crucial for their applications.
• Designing host molecules with high binding affinity and selectivity for fullerenes remains a challenge.

Purpose of the Study:

• To synthesize a new series of rigid, all meta-phenylene, conjugated deep-cavity molecules.
• To investigate the binding affinity of these molecules towards fullerenes.
• To develop a facile synthetic approach for these novel host molecules.

Main Methods:

• Synthesis of deep-cavity molecules by covalently linking resorcin[4]arene and [12]cyclo-meta-phenylene moieties via acetal bonds.
• Utilizing a templating strategy for efficient synthesis.
• ¹H NMR titration experiments to determine fullerene binding affinities (K_a).

Main Results:

• Successful synthesis of rigid, glove-like deep-cavity molecules, named nanogloves.
• Achieved high binding affinities for fullerenes, with K_a exceeding ≥10⁶ M^-1.
• Demonstrated fullerene recognition across a range of sizes (C₆₀ to C₉₆) from carbon soot.

Conclusions:

• The developed nanogloves exhibit excellent size complementarity with fullerenes, maximizing host:guest interactions.
• The synthetic strategy provides a facile route to these high-affinity fullerene hosts.
• These nanogloves show potential for selective fullerene separation and recognition applications.