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.
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Kubozono et al. (1995) studied this question.
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