Abstract
It has been proved that the spin multiplicity of an aromatic hydrocarbon, benzene-1,3,5-tris-phenylmethylene, is septet in the electronic ground state. This is the highest spin multiplicity known with organic molecules. The observed g value and fine structure parameters D and E are 2.0038, +0.04158 cm −1, and ±0.01026 cm −1, respectively. These parameters are consistent with the model that three parallel spins are delocalized over the whole molecule while the remaining three are localized on each of the three divalent carbon atoms. Existence of such a molecule is a clear demonstration of the beautiful theory of Longuet-Higgins on alternant hydrocarbons.
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