Aromaticity and superaromaticity in carbon nanotoroids

Abstract

Percentage topological resonance energies (%Etrs) have been estimated for 15 hypothetical carbon nanotoroids composed of 240 carbon atoms. These carbon materials were predicted to be moderately aromatic with moderately large positive %Etrs. They are presumably less aromatic than graphite and carbon nanotubes, but must be appreciably more aromatic than fullerenes such as C60 and C70. It seems that superaromaticity arising from torus-shaped super-ring structures is negligible.