It is shown that electronic absorption characteristics of many examples of dye molecules containing unsaturated five-membered ring systems can be explained in terms of anti-aromaticity of the rings. The criteria used to assign anti-aromatic character are specified. These are less restrictive than in the original definition of anti-aromaticity given by Breslow.
F. Dietz, N. Tyutyulkov and M. Rabinovitz, J. Chem. Soc., Perkin Trans. 2, 1993, 157 DOI: 10.1039/P29930000157
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