Concise Synthesis of Open-Cage Fullerenes for Oxygen Delivery

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Fullerenes (C60) are spherical carbon molecules with potential applications in drug delivery and materials science.
• Creating open-cage fullerenes allows for encapsulation of guest molecules.
• Controlling the release of encapsulated substances is crucial for practical applications.

Purpose of the Study:

• To synthesize open-cage fullerenes with a defined orifice.
• To investigate the encapsulation and controlled release of oxygen using these novel fullerene structures.
• To evaluate the potential of these materials for oxygen delivery.

Main Methods:

• Preparation of open-cage fullerenes from C60 through a three-step synthesis.
• Utilizing aniline-mediated ring expansion of a fullerene-mixed peroxide with a ketolactone moiety.
• Characterization of oxygen encapsulation and release kinetics under varying conditions.

Main Results:

• Successfully synthesized open-cage fullerenes with a 19-membered orifice.
• Achieved oxygen encapsulation at room temperature and moderate pressure (50 atm).
• Demonstrated slow oxygen release under ambient conditions with an activation energy of 18.8 kcal/mol and a half-life of 73 min at 37°C.

Conclusions:

• The ring strain release in fullerenes drives efficient cage-opening.
• The synthesized open-cage fullerene derivative is a promising material for controlled oxygen delivery.
• Further research could explore therapeutic or industrial applications of this oxygen-delivery system.