Wavelength and solvent independent photochemistry: the electrocyclic ring-closure of indolylfulgides

Cordes, T., Herzog, T. T., Malkmus, S., Draxler, S., Brust, T., DiGirolamo, J. A., Lees, W. J. & Braun, M., 2009, In : Photochemical & Photobiological Sciences. 8, 4, p. 528-534 7 p.

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  • Thorben Cordes
  • Teja T. Herzog
  • Stephan Malkmus
  • Simone Draxler
  • Thomas Brust
  • Jessica A. DiGirolamo
  • Watson J. Lees
  • Markus Braun
A wavelength and solvent dependent study of a photochromic indolylfulgide is presented. The ring-closure reaction is characterized using stationary and time-resolved spectroscopy with femtosecond time resolution. After excitation into the first excited singlet state (S1) the photoprocesses proceed on ultrafast timescales (0.3–0.45 ps) in both polar and non-polar solvents. Excitation into higher electronic states results in similar reaction kinetics as found for S1 excitation. A simple kinetic scheme can be established for the photoprocesses under all different experimental conditions: as expected from organic textbooks neither the solvent surroundings nor the excitation wavelength strongly alter the reaction scheme. The experimental study demonstrates that the ring-closure reaction of photochromic indolylfulgides can be considered as a very robust photoprocess: this fact may lead to a great variety of different applications where the reaction dynamics of the molecular switch are not disturbed by any surrounding effects.
Original languageEnglish
Pages (from-to)528-534
Number of pages7
JournalPhotochemical & Photobiological Sciences
Issue number4
Publication statusPublished - 2009

ID: 14535004