Reductive Decarbonylation of a Cage-Opened C₆₀ Derivative

Area of Science:

• Supramolecular Chemistry
• Nanotechnology
• Physical Chemistry

Background:

• Fullerenes (C60) are spherical molecules with unique cage structures.
• Encapsulation of molecules within fullerenes is a key area of research.
• Previous studies suggested a minimum orifice size of 16 atoms for water encapsulation in fullerenes.

Purpose of the Study:

• To investigate the decarbonylation of a cage-opened C60 derivative.
• To explore the spontaneous encapsulation of water molecules into this derivative.
• To understand the structural requirements for molecular encapsulation in fullerenes.

Main Methods:

• Decarbonylation of a cage-opened C60 derivative using single-electron reductants.
• Analysis of the encapsulation process and orifice formation.
• Crystallographic analysis to determine the orifice structure and shape.

Main Results:

• Spontaneous encapsulation of water molecules (up to 78%) was observed.
• Encapsulation occurred through a 14-membered ring orifice, contradicting previous size requirements.
• Crystallographic data revealed a near-circular orifice shape, reducing the activation barrier for water encapsulation.

Conclusions:

• Water molecules can be encapsulated into fullerene derivatives through smaller orifices than previously thought.
• The shape of the orifice, particularly its circularity, plays a crucial role in lowering the activation barrier for encapsulation.
• This finding opens new possibilities for designing fullerene-based nanocontainers.