Berlin 2014 – scientific programme
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MO: Fachverband Molekülphysik
MO 5: Posters 1: Electronic Spectroscopy, Photochemistry, Femtosecond Spectroscopy
MO 5.13: Poster
Monday, March 17, 2014, 16:30–18:30, Spree-Palais
Excited-state proton transfer in a pyranine-derived super-photoacid — •Johannes Knorr1, Björn Finkler2, Gregor Jung2, and Patrick Nuernberger1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg — 2Biophysikalische Chemie, Universität des Saarlandes, 66041 Saarbrücken
The phenomenon of photoacidity, i.e. an increase in acidity by some orders of magnitude upon electronic excitation, is frequently met in aromatic alcohols capable of transferring a proton to a suitable acceptor [1]. We recently synthesized a promising new class of so-called super-photoacids and their methylated counterparts based on pyrene, and demonstrated the extent of solvent induced solvatochromic effects by means of changes in the respective absorption and emission spectra [2]. Aiming at deeper insights into the underlying mechanisms contributing to excited-state intermolecular proton transfer, we extend our study by scrutinizing the associated ultrafast dynamics employing transient absorption spectroscopy in combination with fluorescence detection. Specifically, we try to explore whether vibrational excess energy has any influence on the proton-transfer process.
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