Endohedral metallofullerene Ca@C60 has been prepared by archeating of graphite rod containing calcium oxide, CaO, and extracted by pyridine under the oxygen-free condition. The laser desorption time-of-flight (LD-TOF) mass spectrum of the pyridine solution exhibits five main peaks due to C60+, Ca@C60+, C70+, Ca@C70+, and C74+. It has been found that Ca@C60 can be extracted only under the atmosphere of degassed pyridine owing to its high oxygen-sensitivity.

Endohedral metallofullerene Ce@C60 has been enriched in the extracted solution of the soot prepared by arc-heating of CeO/graphite composite rods. The enrichment of Ce@C60 in aniline solution containing the hollow and the other endohedral fullerenes have been performed by using high performance liquid chromatography (HPLC) technique. The laser desorption time-of-flight (LD-TOF) mass spectrum shows clearly the enrichment of Ce@C60.

Endohedral metallofullerenes, Ca@C60 and Sr@C60, prepared by the arc-heating of the graphite rods containing CaO and SrO, respectively, have been extracted with aniline under the air atmosphere. The laser desorption time-of-flight (LD-TOF) mass spectra for the extracted solutions exhibit intense peaks due to M@C60+ (M: Ca and Sr) and C60+ with weak peaks due to the other hallow fullerenes and metallofullerenes.

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