Ring-opening reaction of a trifluorinated indolylfulgide: mode-specific photochemistry after pre-excitation.
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.
Draxler
Simone
S
Munich Center for Integrated Protein Science, Ludwig-Maximilians-Universität München, Munich, Germany.
Brust
Thomas
T
Malkmus
Stephan
S
DiGirolamo
Jessica A
JA
Lees
Watson J
WJ
Zinth
Wolfgang
W
Braun
Markus
M
D006845:Hydrocarbons, Fluorinated / Q000737:chemistry*; D007211:Indoles / Q000737:chemistry*; D015394:Molecular Structure; D010777:Photochemistry
D006845:Hydrocarbons, Fluorinated; D007211:Indoles