A new and efficient extraction method using DMF ( N, N -dimethylformamide) was developed to concentrate endohedral metallofullerenes. This single-step extraction method obtained a solution containing 5−15% endohedral metallofullerenes and strongly discriminated against the dominant C 60, C 70, and higher empty fullerenes in raw soot. This highly selective extraction procedure substantially reduced sample loading in the HPLC isolation for a given volume of sample injection. The efficiency of our separation method is demonstrated by the isolation of the endohedral metallofullerene Ce@C 82 .
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Ding et al. (1996) studied this question.
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