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Right here we display a brand new method for managing the shape of the S1 energy profile which relies on tuning the amount of excited-state aromaticity (ESA). In a few fluorescent π-expanded oxepins, the power reduce associated the bent-to-planar conformational improvement in S1 becomes less pronounced with reduced ESA amounts. Stabilization energies following from ESA had been quantitatively determined to be 10-20 kcal/mol using photophysical data. Extremely fast planarization character