Z-E Photo-Isomerisation of Styrene- and Stilbene-Derived Push-Pull Systems Bearing 4, 5-Dicyanoimidazole Unit

Z-E isomerisation of six styrene- and stilbene-derived chromophores featuring 4, 5-dicyanoimidazole unit was investigated. The photo-isomerisation was induced by irradiation of the chormophore in ethyl acetate. The observed photo-isomerisation has been studied by measuring absorption and fluorescenc...

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Bibliographic Details
Published in:Journal of materials science and engineering. A 2011-07, Vol.1 (2), p.146-151
Main Authors: Almonasy, N, Bures, F, Kulhanek, J, Machalicky, O
Format: Article
Language:English
Subjects:
Absorbance
Bearing
Fluorescence
Irradiation
Microstructure
NMR spectroscopy
Quenching
Spectra
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Summary:Z-E isomerisation of six styrene- and stilbene-derived chromophores featuring 4, 5-dicyanoimidazole unit was investigated. The photo-isomerisation was induced by irradiation of the chormophore in ethyl acetate. The observed photo-isomerisation has been studied by measuring absorption and fluorescence spectra as well as by super(1)H NMR spectroscopy. It was found that the absorbance of the longest-wavelength band of starting E-isomers decreased and, simultaneously, the absorbance of Z-isomers in the short-wavelength region increased during the irradiation. Additionally, a gradual decrease of the fluorescence intensity was observed. The fluorescence quenching was attributed to the formation of a non-fluorescent Z-isomer.
ISSN:2161-6213