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MO: Fachverband Molekülphysik
MO 15: Environment Controlled Processes
MO 15.5: Talk
Thursday, March 9, 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.
T. Förster, Naturwissenschaften 36, 186 (1949)
C. Spies et al., Phys. Chem. Chem. Phys. 15, 19893 (2013)
B. Finkler et al., Photochem. Photobiol. Sci. 13, 548 (2014)