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Direct Structural Determination of Conformations of Photoswitchable Molecules by Laser Desorption–Electron Diffraction

Authors

  • Andreas Gahlmann,

    1. Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125 (USA)
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  • I-Ren Lee,

    1. Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125 (USA)
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  • Ahmed H. Zewail Prof.

    1. Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125 (USA)
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  • This work was supported by the National Science Foundation and the Air Force Office of Scientific Research in the Gordon and Betty Moore Center of Physical Biology at Caltech.

Abstract

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Die Beteiligung mannigfacher Strukturen an der komplexen Photochemie photoschaltbaren Nitro-substituierten 1,3,3-Trimethylindolinbenzospiropyrans wird durch Elektronenbeugung offenbart. Die Isomerisierung der Spiropyran- zur Merocyaninform bei der Ringöffnung ergibt vornehmlich die cis-trans-cis-Struktur (siehe Bild; rot O, blau N, gelb C), während konkurrierende strahlungslose Pfade zu anderen Strukturen führen, nämlich den geschlossenen Formen in ihren Triplett- und Singulett-Grundzuständen.

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