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"Ultrafast Ring-Closure Reaction of Photochromic Indolylfulgimides Studied with UV-Pump-IR-Probe Spectroscopy" F. O. Koller, W. J. Schreier, T. E. Schrader, S. Malkmus, C. Schulz, S. Dietrich, K. Rück-Braun, and M. BraunJournal of Physical Chemistry A 112 (2008) 210-214. Abstract: The ring-opening and ring-closure reactions of a photochromic indolylfulgimide are investigated with femtosecond vibrational spectroscopy. Spectral signatures due to excited-state decay and vibrational cooling are seen in the mid-IR region. For the ring-opening reaction triggered with visible pulses, a lifetime of the excited electronic state of 4 ps was obtained in polar solution. In a nonpolar solvent, this time constant is reduced to 2 ps. The ring-closure reaction induced with UV pulses displays an excited-state lifetime and thus a building of the photoproduct of roughly 0.5 ps. For all processes, the subsequent cooling occurs on a 15-ps time scale lasting up to ~50 ps. The time-resolved IR measurements do not support the existence of any long-living intermediate states. BMO authors (in alphabetic order): Markus Braun Florian Koller Stephan Malkmus Tobias Schrader Wolfgang Schreier Assoziierte Projekte: Peptide and protein folding Spectroscopy of the functional dynamics of proteins  WWW-Version |