Photochromic Bis(thiophen-3-yl)maleimides Studied with Time-Resolved SpectroscopyElsner, C., Cordes, T., Dietrich, P., Zastrow, M., Herzog, T. T., Rück-Braun, K. & Zinth, W., 2009, In : The Journal of Physical Chemistry. A: Molecules, Spectroscopy, Kinetics, Environment, & General Theory. 113, 6, p. 1033-1039 7 p.
Research output: Contribution to journal › Article › Academic › peer-review
The dynamics of the ring-closure reaction of three different bis(thiophen-3-yl)maleimides are investigated using ultrafast spectroscopy in the visible range. The structures of the molecules differ with respect to substitution of the thiophene ring and the maleimide. The experiments reveal reaction kinetics which point to the population of an excited electronic state for several nanoseconds. In the case of completely unsubstituted thiophene rings, a long excited-state lifetime (biexponential decay with 3 and 15 ns) can be observed. The remaining ultrafast absorption transients of this molecule are due to relaxational processes on the excited electronic potential energy surface. The ring-closure reaction has a small yield (
|Number of pages||7|
|Journal||The Journal of Physical Chemistry. A: Molecules, Spectroscopy, Kinetics, Environment, & General Theory|
|Publication status||Published - 2009|