Photostability of 4,4′‐Dihydroxythioindigo,a Mimetic of Indigo |
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Authors: | Marc Dittmann Franziska F. Graupner Benjamin Maerz Sven Oesterling Prof. Dr. Regina de Vivie‐Riedle Prof. Dr. Wolfgang Zinth Prof. Dr. Martin Engelhard Prof. Dr. Wolfgang Lüttke |
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Affiliation: | 1. Max Planck Institute of Molecular Physiology, Otto‐Hahn‐Strasse 11, 44227 Dortmund (Germany);2. Faculty of Physics and Center for Integrated Protein Science CIPSM, Ludwig‐Maximilians‐Universit?t München, Oettingenstrasse 67, 80538 München (Germany);3. Department of Chemistry, Ludwig‐Maximilians‐Universit?t München (Germany);4. Institut für Organische und Biomolekulare Chemie, Georg‐August‐Universit?t G?ttingen, Tammanstrasse 4, 37077 G?ttingen (Germany) |
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Abstract: | The photochemical properties of indigo, a widely used industrial dye, has attracted both experimentalists and theoreticians from the beginning. Especially the high photostability of indigo has been the subject of intensive research. Recently, it was proposed that after photoexcitation an intramolecular proton transfer followed by a nonradiative relaxation to the ground state promote photostability. In indigo the hydrogen bond and the proton transfer occur between the opposing hemiindigo parts. Here, we provide experimental and theoretical evidence that a hydrogen transfer within one hemiindigo or hemithioindigo part is sufficient to attain photostability. This concept can serve as an interesting strategy towards new photostable dyes for the visible part of the spectrum. |
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Keywords: | dyes/pigments photochemistry proton transfer thioindigo ultrafast spectroscopy |
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