Double aromaticity and anti-aromaticity in small carbon ringsElectronic supplementary information (ESI) available: computed 3D coordinates as PDB files. See http://www.rsc.org/suppdata/cc/b0/b002922j/
Abstract
Calculated NICS indices for C10 and C14 indicate these species are doubly aromatic and that C12 is doubly anti-aromatic, with the π-aromaticity dominating the σ-contribution in systems such as triplet C10, C8N2, C10B2 or C122+ all of which have opposing aromatic/anti-aromatic character.