Calculation of the singlet-triplet splitting of the dinegative ions of some aromatic molecules

Abstract
Calculations have been made on some dinegative ions of hydrocarbons having C3 symmetry axes, namely coronene, (18)-annulene, triphenylbenzene, decacyclene and triphenylene. When configuration interaction is allowed for only decacyclene and triphenylbenzene in a twisted configuration are calculated to have triplet ground states. These calculations agree with the available experimental data.
Keywords