Excited-state proton transfer of 3-hydroxybenzoic acid and 4-hydroxybenzoic acid
Excited-state proton transfer of 3-hydroxybenzoic acid and 4-hydroxybenzoic acid
Vulpius, D.; Geipel, G.; Bernhard, G.
The excited-state proton transfer of 3-hydroxybenzoic acid and 4-hydroxybenzoic acid was studied by time-resolved laser-induced fluorescence spectroscopy with ultra-short laser pulses. The excited-state reactions were identified in aqueous media as a function of the pH value. Apart from the well-known inversion of the ordinary dissociation properties of these compounds, new species were found which exist only in the excited-state resulting from a temporal and reversible annihilation of the aromatic bond system. These species and their reaction mechanisms were detected by their absorption and fluorescence spectra.
Keywords: 3-Hydroxybenzoic acid; 4-Hydroxybenzoic acid; Excited-state proton transfer; Time-resolved laser-induced fluorescence; spectroscopy
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Spectrochimica Acta Part A 75(2010), 558-562
DOI: 10.1016/j.saa.2009.11.016
ISSN: 1386-1425/$
Cited 8 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-13634