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Impressum
(c) 2002 BMO

"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. Braun
Journal 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


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Letzte Änderung: 2016-09-14 13:34