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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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Keywords: ENHANCED FLUORESCENCE; GLASSY POLYMER; PYRAZINE; QUANTUM YIELD; TRIARYLETHENE

Document Type: Research Article

Publication date: 01 May 2015

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