T Population As the Driver of Excited-State Proton-Transfer in 2-Thiopyridone

Overview

Journal Chemistry

Specialty Chemistry

Date 2018 Nov 20

PMID 30452789

Citations 5

Authors

Sebastian Eckert

Jesper Norell

Raphael M Jay

Mattis Fondell

Rolf Mitzner

Michael Odelius

Alexander Fohlisch

Affiliations

Soon will be listed here.

Abstract

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 N 1s X-ray absorption spectroscopy and multi-configurational spectrum simulations. Photoexcitations to the singlet S and S states both relax promptly through intersystem crossing to the triplet T state. The T state, through its rapid population and near nanosecond lifetime, mediates nitrogen site deprotonation by ESPT in a secondary intersystem crossing to the S 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.

Citing Articles

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T Population as the Driver of Excited-State Proton-Transfer in 2-Thiopyridone.

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PMID: 30452789 PMC: 6470867. DOI: 10.1002/chem.201804166.

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