Influence of para-substituents and solvents on selective precipitation of fullerenes by inclusion in calix[8]arenes

Abstract Twelve calix[8]arene derivatives ( 1 8 R) with different para -substituents (R) were synthesized and applied to selective precipitation of C 60 and C 70 from benzene and toluene. 1 8 Pr i and 1 8 Bu t precipitates from benzene and toluene, forming a 1:1 complex with C 60 whereas only 1 8 Bu t precipitates from benzene, forming a 1:2 1 8 Bu t /C 70 complex. The spectroscopic studies of the precipitate complexes are also reported.