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Enhanced Fluorescence of Triarylethenes Having a Pyrazine Ring in Microcrystals and Glassy Polymer Films

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We investigated the fluorescence spectra and quantum yields of the pyrazine derivatives 2,5-bis[2,2-di(p-tolyl)ethenyl]pyrazine and 2-[2,2-di(p-tolyl)ethenyl]-5-(4-methoxyphenyl)pyrazine in solution, glassy polymer films and microcrystals (polycrystalline powders). The absolute fluorescence quantum yield increased by 40- to 48-fold in microcrystals and 7.2-fold in molecularly dispersed polymer films compared with these compounds in solution. The absorption and fluorescence spectra of microcrystals were substantially red-sifted. These results show that aggregation enhanced the emission from pyrazine derivatives and that the enhancement resulted from both planarization due to molecular interactions and restriction of molecular motion.
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Document Type: Research Article

Publication date: May 1, 2015

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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