Extractions of Y@C_(60), Ba@C_(60), La@C_(60), Ce@C_(60), Pr@C_(60), Nd@C_(60), and Gd@C_(60) with Aniline

摘要

Recently many endohedral metallofullerenes such as M@C_(74), M@C_(80), and M@C_(82) (M; metal atom) have been successfully isolated by the high performance liquid cinematography (HPLC) technique. Some M@C_(60) were prepared in primary soots by an arc-heating or a laser-Aaporization method, but the isolation of M@C_(60) has not yet been achieved because of the difficulties in extraction; only the extraction of Ca@C_(60) with pyridine has been reported so far. Recently we found that aniline is a suitable extraction solvent for Ca@C_(60) and Sr@C_(60). For the isolation of M@C_(60) by an HPLC technique it is important to find a suitable extraction solvent for M@C_(60). In the present study, we report the successful extraction of Y@C_(60), Ba@C_(60), La@C_(60) Ce@C_(60), Pr@C_(60), Nd@C_(60), and Gd@C_(60) with aniline under an air atmosphere.