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MO: Fachverband Molekülphysik
MO 21: Ultrafast Dynamics II
MO 21.1: Vortrag
Donnerstag, 14. März 2024, 14:30–14:45, HS 3044
Reversible Switching based on intramolecular long-range Proton Transfer — Chris Rehhagen1, Miguel Argüello Cordero1, Fadhil Kamounah2, Vera Deneva3, Ivan Angelov3, •Marvin Krupp1, Søren Svenningnsen2, Michael Pittelkow2, Stefan Lochbrunner1, and Liudmil Antonov3 — 1Institute for Physics and Department of Life, Light and Matter, University of Rostock, 18059 Rostock, Germany — 2Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark — 3Institute of Electronics, Bulgarian Academy of Sciences
A molecular switch is one of the essential elements in molecular electronics. The main requirement in the design of molecular switches is to provide a fast and clean interconversion between structurally different molecular (on- and off-) states. Currently existing molecular switches are either chemically or light driven. The proton transfer could be a new and attractive elementary switching process, because the change in the tautomeric state is always accomplished by a fast proton exchange between the reaction centers in the same molecule. The energy required for proton transfer is fairly low, which provides the opportunity for fueling with visible and near infrared light. Therefore, absorption and emission spectra of a new compound HQBT are investigated and further characterized with femtosecond transient absorption spectroscopy. The system consists of a benzothiazole rotor attached to a 7-hydroxy quinoline stator. A clean and ultrafast off-/on- switching, based on intramolecular long-range proton transfer, is observed in solution.
Keywords: molecular switch; proton crane; photochemistry; molecular spectroscopy; femtosecond transient absorption spectroscopy