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MO: Fachverband Molekülphysik
MO 15: Environment Controlled Processes
MO 15.5: Vortrag
Donnerstag, 9. März 2017, 15:30–15:45, N 6
Monitoring the proton-transfer dynamics of a super-photoacid in acetone — •Johannes Knorr1, Bastian Geißler1, Christian Spies1,2, Björn Finkler2, Gregor Jung2 und Patrick Nuernberger1 — 1Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum — 2Biophysikalische Chemie, Universität des Saarlandes, 66123 Saarbrücken
Photoacidity, i.e., a molecule’s higher tendency to release a proton after electronic excitation, caused by changes in the molecule’s electronic distribution that in turn affect corresponding hydrogen bonds, is frequently encountered in aromatic alcohols capable of transferring a proton to a suitable acceptor [1]. In this study, we investigate an extraordinarily strong super-photoacid, namely tris(1,1,1,3,3,3-hexafluoropropan-2-yl)8-hydroxypyrene-1,3,6-trisulfonate [2,3] in the aprotic solvent acetone—an environment which has not been addressed in previous time-resolved studies with other photoacids due to their weaker proton-transfer capabilities. In-depth analysis of time-correlated single-photon counting and femtosecond transient absorption experiments allows us to disclose solvation dynamics and radiative relaxation processes, as well as to derive a reaction scheme comprising the relevant steps of proton transfer along with the characteristic time scales.
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B. Finkler et al., Photochem. Photobiol. Sci. 13, 548 (2014)