Non-superaromatic reference for carbon nanotube as a quasi-one-dimensional pi-bonding model for graphite

A non-superaromatic reference defined for an armchair tubule is proposed as a simple model for the graphite pi-electron system. This kind of reference structure is easy to deal with because of its quasi-one-dimensional character. We found that even the non-superaromatic reference for a relatively thin armchair tubule has essentially the same pi-binding energy per carbon atom as graphite. The accurate pi-binding energy per carbon atom of graphite turned out to be 1.57459724\beta\.