SAMOP 2023 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 9: Ultrafast Dynamics I (joint session MO/A)

A 9.7: Vortrag

Dienstag, 7. März 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)