Hannover 2020 – scientific programme

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MO: Fachverband Molekülphysik

MO 5: MO Poster 1

MO 5.6: Poster

Monday, March 9, 2020, 17:00–19:00, Empore Lichthof

Finding molecules for consecutive photoinduced electron transfer (conPET) — •Carina Allacher, Patrick Nuernberger, and Bernhard Dick — Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Germany

In photosynthesis, nature combines the energy of several photons to perform a chemical reaction. In 2014 König et al. [1] proposed the conPET mechanism (consecutive photoinduced electron transfer) in order to combine two photons in a photochemical reaction. The first photon excites a photocatalyst molecule M to the excited state M^* which extracts an electron from a donor molecule D. The resulting radical M^• is excited by a second photon, and the excited radical M^{• *} transfers the electron to an acceptor molecule A which is reduced and undergoes further chemical reactions. In a search for such photocatalysts we generate the radical M^• electrochemically. This allows a study of the photophysics of the conPET species M^• separated from the photochemistry involved in generating the radical. Cyclic voltammetry in combination with fs transient spectroscopy yields the reduction potential of M^• and the lifetime M^{• *}. First results obtained with the photocatalyst R6G show that the properties and reactivities of the electrochemically generated radical are the the same as those of the photochemically generated radical.

[1] I. Gosh, T. Gosh, J. I. Bardagi, B. König, Science 2014, 346, 725–728.