Abstract
Abstract The topological resonance energies (TREs) indicate that mono- to hexaanions of C60 are as aromatic as the neutral species. The tendency of multiply charged C60 anions to retain their own spherical conjugated systems can be attributed to aromatic character. Tetraanions of C28, C36, and C44 are likewise predicted to be highly aromatic. Thus, the formation of metallofullerenes, such as U@C28, U@C36, and U@C44, can be rationalized in terms of aromaticities of the ligands.
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