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The energetic stability of the ground and excited state species were counterposed against the aromaticity index derived from local vibrational modes. It was found that the large Stokes shift of the fluorophores (up to <jats:italic>ca.<\/jats:italic> 5800 cm) originates from the effect of electron donating and electron withdrawing substituents rather than \u2010delocalization and related (anti\u2010)aromaticity. On the basis of nonadiabatic molecular dynamics simulations, the absence of fluorescence from one of the regioisomers was explained by the occurrence of easily accessible S\/S conical intersections below the vertical excitation energy level. 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