Separation and Selective Formation of Fullerene Adducts within an M~Ⅱ_8L_6 Cage

摘要

The self-assembly of 4-fold-symmetric porphyrins with Fe~(11) or Zn~(11) gave a new cubic M~Ⅱ_8L_6 cage framework with electron-deficient walls. This cage bound C_(60)-indene or C_(60)-anthracene bisadducts selectively, whereas unfunctionalized fullerenes and monoadducts were not encapsulated. The Fe~Ⅱ_8L_6 cage also enabled the reaction of C_(60) and anthracene to yield the bisadducts selectively under conditions where no reaction was observed in the absence of the cage. These findings have relevance in the context of polymer solar cells, where C_(60) bisadducts have found use as electron acceptors, because these adducts currently require laborious and time-consuming syntheses and purification.