Synthesis and proton-induced fluorescence “OFF–ON” switching of a new D-π-A type pyran dye

Synthesis and proton-induced fluorescence “OFF–ON” switching of a new D-π-A type pyran dye A new D-π-A type 4-(dicyanomethylene)-2-methyl-6-((1,4-diethyl-1,2,3,4-tetrahydroquinoxalin-6-yl)vinyl)-4H-pyran (DCM-Q) dye has been prepared by condensation. Under neutral or alkaline conditions, DCM-Q had a long absorption wavelength, because of intramolecular charge transfer (ICT), but weak fluorescence, because of photoinduced electron transfer (PET) in the excited state. In the presence of protons, the absorption wavelength of DCM-Q was blue shifted, owing to weak ICT, whereas the fluorescence intensity increased, because of limited PET. DCM-Q has potential as an efficient fluorescence “OFF–ON” switch for proton determination. Research on Chemical Intermediates Springer Journals

Synthesis and proton-induced fluorescence “OFF–ON” switching of a new D-π-A type pyran dye

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Springer Netherlands
Copyright © 2013 by Springer Science+Business Media Dordrecht
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
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