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T-1 Population as the Driver of Excited-State Proton-Transfer in 2-Thiopyridone
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Vise andre og tillknytning
Rekke forfattare: 72019 (engelsk)Inngår i: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 25, nr 7, s. 1733-1739Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Excited-state proton transfer (ESPT) is a fundamental process in biomolecular photochemistry, but its underlying mediators often evade direct observation. We identify a distinct pathway for ESPT in aqueous 2-thiopyridone, by employing transient N1s X-ray absorption spectroscopy and multi-configurational spectrum simulations. Photoexcitations to the singlet S-2 and S-4 states both relax promptly through intersystem crossing to the triplet T-1 state. The T-1 state, through its rapid population and near nanosecond lifetime, mediates nitrogen site deprotonation by ESPT in a secondary intersystem crossing to the S-0 potential energy surface. This conclusively establishes a dominant ESPT pathway for the system in aqueous solution, which is also compatible with previous measurements in acetonitrile. Thereby, the hitherto open questions of the pathway for ESPT in the compound, including its possible dependence on excitation wavelength and choice of solvent, are resolved.

sted, utgiver, år, opplag, sider
2019. Vol. 25, nr 7, s. 1733-1739
Emneord [en]
excited-state proton-transfer, intersystem crossing, nitrogen, photochemistry, X-ray absorption
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-167674DOI: 10.1002/chem.201804166ISI: 000459811300018PubMedID: 30452789OAI: oai:DiVA.org:su-167674DiVA, id: diva2:1301998
Tilgjengelig fra: 2019-04-03 Laget: 2019-04-03 Sist oppdatert: 2019-04-03bibliografisk kontrollert

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Norell, JesperJay, Raphael M.Odelius, Michael
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