American Chemical Society, Journal of the American Chemical Society, 15(129), p. 4534-4535, 2007
DOI: 10.1021/ja070880i
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A structural isomer of the core chromophore (p-HBDI) in green fluorescence protein, o-HBDI, is synthesized. o-HBDI possesses a seven-membered-ring hydrogen bond, from which the excited-state intramolecular proton transfer takes place, resulting in a remarkable tautomer emission of similar to 605 nm.