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Erlangen 2022 – scientific programme

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MO: Fachverband Molekülphysik

MO 8: Poster 1

MO 8.22: Poster

Tuesday, March 15, 2022, 16:30–18:30, P

Juxtaposition of the photolysis of diphenyldiselenide Ph2Se2 and diphenylselenide Ph2Se and the subsequent recombination dynamics of the transient radicals — •Daniel Grenda1, Carina Allacher1, Elias Harrer1, Roger Jan Kutta1, Alexander Breder2, and Patrick Nuernberger11Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93040 Regensburg — 2Institut für Organische Chemie, Universität Regensburg, 93040 Regensburg

Organoselenium compounds can be used as effective catalysts in organic synthesis [1], they are building up polymers with dynamic covalent bonds [2] and they are working as antioxidants in vivo [3]. This rich chemistry is possible by virtue of the low bond energy of selenium bonds [2] and recombination of selenium-centered radicals.
By transient absorption spectroscopy on a nano- to microsecond timescale, we follow the dynamics of Ph2Se and Ph2Se2 after photodissociation of the carbon-selenium or the selenium-selenium bond, respectively, forming the radicals PhSe and Ph. Both species photodegrade over prolonged illumination and partially interconvert into each other due to bimolecular radical pair recombination. Comparison of the differences and analogies of the photochemistry of Ph2Se2 and Ph2Se allows a specific identification of the entire reaction pathways, intermediates and products.
[1] J. Trenner et al., Angew. Chem. Int. Ed. 52, 8952 (2013).
[2] S. Ji et al., Angew. Chem. Int. Ed. 53, 6781 (2014).
[3] L. P. Borges et al., Chem.-Biol. Interact., 160, 99 (2006).

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