SAMOP 2023 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 6: Poster I

MO 6.21: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Excited-state dynamics of aqueous aminoazobenzene Metanil Yellow studied by time-resolved transient absorption spectroscopy — •Alina Khodko^1,5, Matthew Mgbukwu⁴, Camilo Granados^1,4, Evgenii Titov^2,3, Stefan Haacke⁴, Oleg Kornilov¹, and Jérémie Léonard⁴ — ¹Max Born Institute, Max-Born-Straße 2A, 12489 Berlin, Germany — ²Institute of Physical and Theoretical Chemistry, University of Würzburg, Germany — ³Institute of Chemistry, University of Potsdam, Germany — ⁴Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504, Strasbourg, France — ⁵Institute of Physics NAS of Ukraine, Nauky Ave, 46, 03028, Kyiv, Ukraine

The excited-state dynamics of the aminoazobenzene Metanil Yellow in aqueous solutions was studied using ultrafast time-resolved transient absorption spectroscopy in both the UV-visible and the NIR regions. The different solutions were studied with different excitation wavelengths to investigate the protonated and non-protonated forms of the molecule and reveal differences in the corresponding dynamics. The relaxation dynamics of the non-protonated form was previously studied by time-resolved photoelectron spectroscopy and TDDFT calculations and revealed transitions from the bright S2 to the ground state S0 via the dark S1 state. As a first interpretation, the present results for the protonated form could be explained by direct excitation of S1 followed by the proton ejection during the first 0.5-1.0 ps. After 1 ps the excited state absorption looks similar for both forms and reflects the internal conversion to the trans ground state along the torsional coordinate.