“…The enhanced stability is manifested from the transfer of charge from the incorporated atoms, molecules, ions, and so forth, to the carbon cage. The status of the current literature focuses on the endohedral derivatives of large fullerene cages, C n (n ≥ 60), in which metals, nonmetals, and metalloids are located inside the cage structure, and heterofullerenes that incorporate nonmetal dopants into the cage structure …”