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On the barrier to excited-state intramolecular proton transfer (ESIPT): the controversial assignment of the spectra of 2,5-bis(2-benzoxazolyl)hydroquinone in solid argon

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Dick, Bernhard
Date of publication of this fulltext: 05 Aug 2009 13:50


The spectra of 2,5-bis(2-benzoxazolyl)hydroquinone (I) in solid argon at 15 K reveals two species. The major species (96%) undergoes very efficient excited-state intramol. proton transfer (ESIPT) after excitation to S1. It is assigned to the isolated I mol. (solvated by argon atoms) in which ESIPT is not thermally activated. Either no energy barrier exists or it can be overcome by proton ...


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