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Updated: Jul 15, 2025

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Time-Resolved Spectroelectrochemical Dynamics of Carotenoid 8'-apo-β-Carotenal
Gürkan Keşan1, Emrah Özcan1,2, Pavel Chábera3
1Department of Physics, Faculty of Science, University of South Bohemia in České Budějovice, Branišovská 1760, 370 05 České, Budějovice, Czech Republic.
Abstract:
This work examines the influence of applied external voltage in bulk electrolysis on the excited-state properties of 8'-apo-β-carotenal in acetonitrile by steady-state and ultrafast time-resolved absorption spectroscopy. The data collected under bulk electrolysis were compared with those taken without applied voltage. The steady-state measurements showed that although intensity of the S0 -S2 absorption band varies with the applied voltage, the spectral position remain nearly constant. Comparison of transient absorption spectra shows that the magnitude of the ICT-like band decreases during the experiment under applied voltage condition, and is associated with a prolongation of the S1 /ICT-like lifetime from 8 ps to 13 ps. Furthermore, switching off the applied voltage resulted in returning to no-voltage data within about 30 min. Our results show that the amplitude of the signal associated with the ICT state can be tuned by applying an external voltage.
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