SAMOP 2023 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MO: Fachverband Molekülphysik
MO 4: Ultrafast Dynamics I (joint session MO/A)
MO 4.7: Talk
Tuesday, March 7, 2023, 12:45–13:00, F102
Investigating the oxidation states of a perylene bisimide cyclophane with ultrafast spectroelectrochemistry — •Rebecca Fröhlich1, Jessica Rühe2, Michael Moos2, Frank Würthner2, Christoph Lambert2, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg — 2Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg
From photosynthesis to optoelectronic devices, charged species fulfill essential roles in our everyday world. With spectroelectrochemistry the oxidation states of molecules can be generated and investigated under potential control. In our setup we combine spectroelectrochemistry with femtosecond transient absorption spectroscopy to investigate the dynamics of charged species on an ultrafast timescale [1].
Here we show new data on the oxidation states of a perylene bisimide cyclophane [2]. A fit of the cyclic voltammetry data of the molecule shows four reduction steps with closely lying redox potentials. The four reduced states show a change in absorption which is highlighted by the deconvolution of the absorption spectroelectrochemistry data. Through the fits of the absorption spectra the charged species can be distinguished in a set of transient absorption spectroelectrochemistry maps. The excited state lifetimes of the reduced molecule are analyzed with global fitting and change according to their oxidation state.
[1] J. Heitmüller et al., Spectrochim. Acta Part A, 253, 119567 (2021)
[2] J. Rühe et al., Organic Materials, 2, 149-158 (2020)