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Issue 4, 2009
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Wavelength and solvent independent photochemistry: the electrocyclic ring-closure of indolylfulgides

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Abstract

A wavelength and solvent dependent study of a photochromic indolylfulgide is presented. The ring-closure reaction is characterized using stationary and time-resolved spectroscopy with femtosecond time resolution. After excitation into the first excited singlet state (S1) the photoprocesses proceed on ultrafast timescales (0.3–0.45 ps) in both polar and non-polar solvents. Excitation into higher electronic states results in similar reaction kinetics as found for S1 excitation. A simple kinetic scheme can be established for the photoprocesses under all different experimental conditions: as expected from organic textbooks neither the solvent surroundings nor the excitation wavelength strongly alter the reaction scheme. The experimental study demonstrates that the ring-closure reaction of photochromic indolylfulgides can be considered as a very robust photoprocess: this fact may lead to a great variety of different applications where the reaction dynamics of the molecular switch are not disturbed by any surrounding effects.

Graphical abstract: Wavelength and solvent independent photochemistry: the electrocyclic ring-closure of indolylfulgides

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Article information


Submitted
07 Oct 2008
Accepted
26 Jan 2009
First published
11 Feb 2009

Photochem. Photobiol. Sci., 2009,8, 528-534
Article type
Paper

Wavelength and solvent independent photochemistry: the electrocyclic ring-closure of indolylfulgides

T. Cordes, T. T. Herzog, S. Malkmus, S. Draxler, T. Brust, J. A. DiGirolamo, W. J. Lees and M. Braun, Photochem. Photobiol. Sci., 2009, 8, 528
DOI: 10.1039/B817627B

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