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MO: Fachverband Molekülphysik
MO 5: Ultrafast Dynamics I
MO 5.7: Vortrag
Dienstag, 11. März 2025, 12:30–12:45, HS XVI
Ultrafast photoisomerization dynamics of protonated azobenzene in an ion trap — •Marcel J. P. Schmitt1, Gereon Niedner-Schatteburg1, Sabine Becker1, Carolin Müller2, and Christoph Riehn1 — 1Department of Chemistry, RPTU Kaiserslautern — 2Computer Chemistry Center, FAU Erlangen-Nürnberg, Erlangen
The E/Z photoswitchability of azobenzenes is widely used in biological, medicinal,[1] and optical applications as molecular machines[2] and reversible photoswitchable metallocycles.[3] Less is known about the photophysics and deactivation processes of simple protonated azobenzene compound. Here, we report transient photodissociation action spectra of isolated azonium monocations that reveal ultrafast dynamics of the E isomers. Multiexponential electronic decays in the sub-ps and ps time regimes occur with faster decay rates as for neutral azobenzene. Superimposed, there is a rapidly damped wave packet dynamics of 0.4 ps oscillations that indicate torsional modes of isomerization. These findings find support by nonadiabatic dynamics simulations (CASSCF) that decipher deactivation pathways.
[1] M. Medved’, M. Di Donato, W. J. Buma, A. D. Laurent, L. Lameijer, T. Hrivnák, I. Romanov, S. Tran, B. L. Feringa, W. Szymanski, G. A. Woolley, J. Am. Chem. Soc. 2023, 145, 19894. [2] S. Megow, H.-L. Fitschen, F. Tuczek, F. Temps, J. Phys. Chem. Lett. 2019, 10, 6048. [3] R. I. Petrikat, J. Hornbogen, M. J. P. Schmitt, E. Resmann, C. Wiedemann, N. I. Dilmen, H. Schneider, A. M. Pick, C. Riehn, R. Diller, S. Becker, Chem. Eur. J. 2024, 30, e202400205.
Keywords: Azobenzene; Photoswitching; Wave Packet Dynamics; Nonadiabatic Dynamics Simulations; Femtosecond Spectroscopy