Endohedral fullerenes influence

A first striking observation of this study was the dramatic difference in electron-accepting abilities of isomeric endohedral fullerenes. This difference reaches 0.22 V for the isomers of Yb C76 and even 0.3 V between two isomers of Yb C82. The cage size also influences the reduction potentials. The [CJ and [C2v] isomers of Yb C82 are the best electron acceptors of the family and the second isomer of Yb C76 the weakest electron acceptor. In general, however, these metallofullerenes are better electron acceptors than the available empty cages. The metallofullerenes with bigger cages, Yb C82 and Yb C84, also accept more easily a fifth electron than the others. 

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