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Eckert S, Winghart MO, Kleine C, Banerjee A, Ekimova M, Ludwig J, Harich J, Fondell M, Mitzner R, Pines E, Huse N, Wernet P, Odelius M, Nibbering ETJ. Electronic Structure Changes of an Aromatic Amine Photoacid along the Förster Cycle. Angew Chem Int Ed Engl 2022; 61:e202200709. [PMID: 35325500 PMCID: PMC9322478 DOI: 10.1002/anie.202200709] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Indexed: 11/15/2022]
Abstract
Photoacids show a strong increase in acidity in the first electronic excited state, enabling real‐time studies of proton transfer in acid‐base reactions, proton transport in energy storage devices and biomolecular sensor protein systems. Several explanations have been proposed for what determines photoacidity, ranging from variations in solvation free energy to changes in electronic structure occurring along the four stages of the Förster cycle. Here we use picosecond nitrogen K‐edge spectroscopy to monitor the electronic structure changes of the proton donating group in a protonated aromatic amine photoacid in solution upon photoexcitation and subsequent proton transfer dynamics. Probing core‐to‐valence transitions locally at the amine functional group and with orbital specificity, we clearly reveal pronounced electronic structure, dipole moment and energetic changes on the conjugate photobase side. This result paves the way for a detailed electronic structural characterization of the photoacidity phenomenon.
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Affiliation(s)
- Sebastian Eckert
- Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max Born Strasse 2A, 12489, Berlin, Germany
| | - Marc-Oliver Winghart
- Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max Born Strasse 2A, 12489, Berlin, Germany
| | - Carlo Kleine
- Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max Born Strasse 2A, 12489, Berlin, Germany
| | - Ambar Banerjee
- Department of Physics, Stockholm University, AlbaNova University Center, 106 91, Stockholm, Sweden
| | - Maria Ekimova
- Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max Born Strasse 2A, 12489, Berlin, Germany
| | - Jan Ludwig
- Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max Born Strasse 2A, 12489, Berlin, Germany
| | - Jessica Harich
- Institute for Nanostructure and Solid State Physics, Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761, Hamburg, Germany
| | - Mattis Fondell
- Institute for Methods and Instrumentation for Synchrotron Radiation Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Strasse 15, 12489, Berlin, Germany
| | - Rolf Mitzner
- Institute for Methods and Instrumentation for Synchrotron Radiation Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Strasse 15, 12489, Berlin, Germany
| | - Ehud Pines
- Department of Chemistry, Ben Gurion University of the Negev, P.O.B. 653, Beersheva, 84105, Israel
| | - Nils Huse
- Institute for Nanostructure and Solid State Physics, Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761, Hamburg, Germany
| | - Philippe Wernet
- Department of Physics and Astronomy, Uppsala University, Box 516 Lägerhyddsvägen 1, 751 20, Uppsala, Sweden
| | - Michael Odelius
- Department of Physics, Stockholm University, AlbaNova University Center, 106 91, Stockholm, Sweden
| | - Erik T J Nibbering
- Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max Born Strasse 2A, 12489, Berlin, Germany
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Eckert S, Winghart MO, Kleine C, Banerjee A, Ekimova M, Ludwig J, Harich J, Fondell M, Mitzner R, Pines E, Huse N, Wernet P, Odelius M, Nibbering ET. Electronic Structure Changes of an Aromatic Amine Photoacid along the Förster Cycle. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202200709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sebastian Eckert
- Max Born Institute for Non-Linear Optics and Short Pulse Spectroscopy: Max-Born-Institut fur Nichtlineare Optik und Kurzzeitspektroskopie C1 GERMANY
| | - Marc-Oliver Winghart
- Max Born Institute for Non-Linear Optics and Short Pulse Spectroscopy: Max-Born-Institut fur Nichtlineare Optik und Kurzzeitspektroskopie C1 GERMANY
| | - Carlo Kleine
- Max Born Institute for Non-Linear Optics and Short Pulse Spectroscopy: Max-Born-Institut fur Nichtlineare Optik und Kurzzeitspektroskopie C1 GERMANY
| | - Ambar Banerjee
- Stockholm University: Stockholms Universitet Chemistry SWEDEN
| | - Maria Ekimova
- Max Born Institute for Non-Linear Optics and Short Pulse Spectroscopy: Max-Born-Institut fur Nichtlineare Optik und Kurzzeitspektroskopie C1 GERMANY
| | - Jan Ludwig
- Max Born Institute for Non-Linear Optics and Short Pulse Spectroscopy: Max-Born-Institut fur Nichtlineare Optik und Kurzzeitspektroskopie C1 GERMANY
| | - Jessica Harich
- Center for Free Electron Laser Science Institute for Nanostructure and Solid State Physics GERMANY
| | - Mattis Fondell
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH: Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH Institute for Methods and Instrumentation for Synchrotron Radiation Research GERMANY
| | - Rolf Mitzner
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH: Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH Institute for Methods and Instrumentation for Synchrotron Radiation Research GERMANY
| | - Ehud Pines
- Ben-Gurion University of the Negev Chemistry ISRAEL
| | - Nils Huse
- Center for Free Electron Laser Science Institute for Nanostructure and Solid State Physics GERMANY
| | | | - Michael Odelius
- Stockholm University: Stockholms Universitet Chemistry SWEDEN
| | - Erik T.J. Nibbering
- Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie C1 Max Born Strasse 2A D-12489 Berlin GERMANY
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Eckert S, Norell J, Jay RM, Fondell M, Mitzner R, Odelius M, Föhlisch A. T 1 Population as the Driver of Excited-State Proton-Transfer in 2-Thiopyridone. Chemistry 2019; 25:1733-1739. [PMID: 30452789 PMCID: PMC6470867 DOI: 10.1002/chem.201804166] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Indexed: 01/02/2023]
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 S2 and S4 states both relax promptly through intersystem crossing to the triplet T1 state. The T1 state, through its rapid population and near nanosecond lifetime, mediates nitrogen site deprotonation by ESPT in a secondary intersystem crossing to the S0 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.
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Affiliation(s)
- Sebastian Eckert
- Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24/25, 14476, Potsdam, Germany
| | - Jesper Norell
- Department of Physics, Stockholm University, AlbaNova University Centre, 10691, Stockholm, Sweden
| | - Raphael M Jay
- Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24/25, 14476, Potsdam, Germany
| | - Mattis Fondell
- Institute for Methods and Instrumentation for, Synchrotron Radiation Research, Helmholtz-Zentrum für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489, Berlin, Germany
| | - Rolf Mitzner
- Institute for Methods and Instrumentation for, Synchrotron Radiation Research, Helmholtz-Zentrum für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489, Berlin, Germany
| | - Michael Odelius
- Department of Physics, Stockholm University, AlbaNova University Centre, 10691, Stockholm, Sweden
| | - Alexander Föhlisch
- Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24/25, 14476, Potsdam, Germany.,Institute for Methods and Instrumentation for, Synchrotron Radiation Research, Helmholtz-Zentrum für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489, Berlin, Germany
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