Femtosecond spectroscopy reveals huge differences in the photoisomerisation dynamics between azobenzenes linked to polymers and azobenzenes in solution

Bahrenburg, Julia, Renth, Falk, Temps, Friedrich, Plamper, Felix and Richtering, Walter (2014) Femtosecond spectroscopy reveals huge differences in the photoisomerisation dynamics between azobenzenes linked to polymers and azobenzenes in solution Physical Chemistry Chemical Physics, 16 (23). pp. 11549-11554.

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Abstract

Femtosecond fluorescence up-conversion spectroscopy of two azobenzenes covalently attached to the side chain or linked by covalent bonds at each end into the main chain of polybutylmethacrylate polymer colloids with different cross-linking ratios reveals dramatic differences in the excited-state dynamics compared to the monomer chromophores in solution due to strong mechanical forces in the complex micronetworks. For the azobenzene derivative DR1 in the polymer side chain, the measurements determined an increase of the mean excited-state lifetime after irradiation at lambda = 475 nm to <tau > = 5.5 ps from <tau > = 0.5 ps for the monomer. For the cross-linked BAAB in the polymer main chain, an increase of <tau > was found of more than a factor-of-20. Moreover, with a lifetime of tau = 430 ps, approximate to 12% of the molecules in the tightly (1 : 10) cross-linked polymer were found to remain in the excited state about 100 times longer than observed for the monomer chromophore. These results are of high relevance for applications of photoswitchable polymer materials.

Document Type: Article
Additional Information: Times Cited: 0 Plamper, Felix/E-9747-2012 0
Research affiliation: Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Physical Chemistry
OceanRep > The Future Ocean - Cluster of Excellence
ISSN: 1463-9076
Projects: Future Ocean
Date Deposited: 30 Mar 2015 11:57
Last Modified: 30 Mar 2015 11:57
URI: http://eprints.uni-kiel.de/id/eprint/27118

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