Abstract
Three competitive fluorescence emissions are shown to be observable from a common initial excited singlet state in a prototype aminosalicylate molecule: 2-hydroxy-4-dimethylaminobenzoic acid methyl ester. The fluorescences are assigned as the normal fluorescence S 1 (π, π*)→S 0, the twisted intramolecular charge-transfer or TICT-state fluorescence S 1 ″(TICT)→S 0, and the intramolecular proton-transfer fluorescence S 1 ′(PT)→S 0. Chemical substitution and solvent polarity perturbations are used to corroborate the assignments.
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