Ring-opening reaction of a trifluorinated indolylfulgide: mode-specific photochemistry after pre-excitation

Phys Chem Chem Phys. 2009 Jul 7;11(25):5019-27. doi: 10.1039/b819585d. Epub 2009 Apr 2.


The ring-opening reaction of a trifluorinated indolylfulgide has been studied as a function of temperature and optical pre-excitation where it was found that reaction times decreased as temperature increased from 10.3 ps at 12 degrees C to 7.6 ps at 60 degrees C. Simultaneously, the quantum yields for the ring-opening reaction grew from 3.1% (12 degrees C) to 5.0% (60 degrees C). When the reaction was started from a non-equilibrium state generated by a directly preceding ring-closure process, the ring-opening reaction became faster and the quantum efficiency increased by more than a factor of three. Analysis of the experimental results points to mode-specific photochemistry in that the promoting, photochemically active modes of the photoreaction are efficiently excited by the directly preceding ring-closure reaction.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Hydrocarbons, Fluorinated / chemistry*
  • Indoles / chemistry*
  • Molecular Structure
  • Photochemistry


  • Hydrocarbons, Fluorinated
  • Indoles