Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 7: Femtosecond Spectroscopy 2
MO 7.1: Hauptvortrag
Dienstag, 1. März 2016, 11:00–11:30, f102
Monitoring ultrafast excited-state intramolecular proton transfer by ultrafast electronic and fluorescence spectroscopy — •Andreas Steinbacher1, Pramod Kumar Verma2, Frederico Koch1, Alexander Schmiedel3, Patrick Nuernberger4, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Korea University, Seoul 136-701, Republic of Korea — 3Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 4Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany
Excited-state intramolecular proton transfer (ESIPT) is one of the most successful models for understanding complex proton transfer dynamics. In general, ESIPT is an ultrafast process occuring on a subpicosecond time scale. Hence, we employ transient absorption from the deep-UV to the visible spectral region and fluorescence upconversion to investigate the photoinduced ESIPT dynamics in β-diketones. Electronic excitation in the UV is followed by ultrafast proton transfer to form a vibrationally hot tautomeric species. Further relaxation steps are determined by the actual symmetry of the investigated β-diketone and also by the solvent environment. Here, we adress both issues by comparing the results for symmetric and unsymmetric β-diketones in various solvents. Depending on the actual molecular system, photoisomerization reactions and even ground-state intramolecular proton transfer could be observed.