Abstract
Charged carbon cages in isolable metallofullerenes are kinetically stable with a minimum bond resonance energy ( min BRE )>−0.100 | β| . Charged carbon cages with adjacent pentagons in recently isolated non-classical metallofullerenes, Sc 2@C 66 and Sc 3N@C 68, are not exceptions. In fact, many molecular anions of fullerenes with adjacent pentagons have a large negative min BRE. Nature seems to choose carbon cages from among a small number of kinetically stable fullerene molecular anions with adjacent pentagons to design isolable non-classical metallofullerenes. There is no doubt that the isolated pentagon rule cannot be applied to charged fullerenes.
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