In 1972, Baird showed theoretically that the electron counting rule for aromaticity and antiaromaticity in the lowest ππ* triplet state is opposite to that in the electronic ground state. A pair of compounds that manifests this reversal in character has now been identified and characterized experimentally for the first time.
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Ottosson, H., Borbas, K. A light-switched yin and yang pair. Nature Chem 7, 373–375 (2015). https://doi.org/10.1038/nchem.2242
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DOI: https://doi.org/10.1038/nchem.2242
