title: Stability and reaction dynamics of trifluorinated indolylfulgides.
abstract: Quantum efficiencies and ultrafast dynamics of the ring-closure and ring-opening reaction of a trifluorinated dicyclopropyl indolylfulgide with improved photostability are investigated by stationary and ultrafast absorption spectroscopy. The ring-closure reaction occurs on the time scale of 200 fs and is found to be temperature independent (T = 287 - 333 K). However, an activated behaviour is observed for the ring-opening reaction. A comparison with the corresponding non-substituted indolylfulgide shows that the dicyclopropyl group favours the open isomer via lower cyclisation and higher cycloreversion quantum efficiencies and faster dynamics of the ring-opening reaction.
authors.affiliation: BioMolekulare Optik, Fakultät für Physik, Ludwig-Maximilians-Universität München and Center For Integrated Protein Science Munich (CIPSM), Oettingenstr. 67, D-80538 München, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Brust
authors.forename: Simone
authors.initials: S
authors.lastname: Draxler
authors.forename: Alexander
authors.initials: A
authors.lastname: Popp
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: Watson J
authors.initials: WJ
authors.lastname: Lees
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Zinth
authors.forename: Markus
authors.initials: M
authors.lastname: Braun
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