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"Ring-opening reaction of a trifluorinated indolylfulgide: mode-specific photochemistry after pre-excitation
" S. Draxler, T. Brust, S. Malkmus, J. A. DiGirolamo, W. J. Lees, W. Zinth, M. BraunPhysical Chemistry Chemical Physics 11 (2009) 5019-5027 Abstract: 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 °C to 7.6 ps at 60 °C. Simultaneously, the quantum yields for the ring-opening reaction grew from 3.1% (12 °C) to 5.0% (60 °C). When the reaction was started from a nonequilibrium state generated by a directly preceding ringclosure 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. BMO authors (in alphabetic order): Markus Braun Thomas Brust Simone Draxler Stephan Malkmus Wolfgang Zinth  WWW-Version |