水素分子を内包するフラーレンC60開口型ケトラクタム誘導体の合成
A new open-cage C60 fullerene derivative bearing a bis(hemiketal) unit was obtained through reaction of C60-N-MEM-ketolactam (MEM: 2-methoxyethoxymethyl) with N-methylmorpholine N-oxide in the presence of water, with the structure confirmed by single-crystal X-ray diffraction. The orifice was subsequently expanded to a 15-membered ring by treatment with trifluoroacetic anhydride, yielding a tetraketo derivative. Exposure of this compound to high-pressure H2 gas allowed encapsulation of a single hydrogen molecule within the cage. Following encapsulation, the opening was contracted back to its original dimensions while retaining the H2 inside. The resulting compound represents a potential precursor for the preparation of endohedral azafullerenes that contain an encapsulated hydrogen molecule.
High-pressure H2 gas was used to insert a hydrogen molecule through an enlarged 15-membered ring orifice of an open-cage C60 derivative; subsequent chemical reduction of the opening size trapped the H2 molecule inside the fullerene cage.
The delivery route is not clearly identifiable from this paper. For hydrogen intake, inhalation is the most efficient route; inhalation, however, carries explosion risk (empirical LFL of 10%; high-concentration devices are not recommended).
See also:
https://h2-papers.org/en/papers/24828793