Erlangen 2022 – scientific programme
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MO: Fachverband Molekülphysik
MO 15: Poster 2
MO 15.9: Poster
Wednesday, March 16, 2022, 16:30–18:30, P
Spectroscopic investigation of the light-induced rearrangement of a Xanthine derivative — •Karina Heilmeier1, Thomas Rittner1, Rafael E. Rodríguez-Lugo2, Robert Wolf2, and Patrick Nuernberger1 — 1Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93040 Regensburg — 2Institut für Anorganische Chemie, Universität Regensburg, 93040 Regensburg
The Xanthine derivative 7-(4-methoxyphenyl)-1,3-dimethyl-8-(pyridin-2-yl)-3,7,8,9-tetrahydro-1H-purine-2,6-dione possesses a characteristic purine skeleton additionally modified with pyridine and anisole moieties bound to the five-membered ring. Our studies reveal that ultraviolet light induces the migration of the anisole group from the 7-nitrogen of the purine skeleton to the nitrogen of the pyridine moiety. The isomer emerging as rearrangement product could even be isolated, and the structure was determined by single-crystal X-ray diffraction.
For obtaining a comprehensive picture of the light-induced mechanism leading to the rearrangement, results from stationary measurements are compared to those from ultrafast transient absorption and fluorescence upconversion spectroscopy. In addition, we contrast the photodynamics of the in-situ generated isomer with that of the synthetically isolated one. In further systematic studies, we explore whether photoinduced back-isomerization is achievable as well, and address the role of the solvent’s polarity on the rearrangement.