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Hemicarceplex formation with a cyclotriveratrylene-based molecular cage allows isolation of high-purity (≥99.0%) C70 directly from fullerene extracts.

A cyclotriveratrylene-based molecular cage that favors the formation of a room temperature isolable hemicarceplex with C(70), in the presence of C(60), has been developed. Significant differences in the association and dissociation kinetics of the molecular cage and buckyballs allowed the isolation of C(70) in high purity (≥99.0%) from a commercial fullerene extract without the need for recrystallization or HPLC.