An off-on chemosensor for Hg2+ based on the excimer emission of Anthracene (cas 120-12-7)
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Add time:08/30/2019 Source:sciencedirect.com
A quinazoline derivative 6-anthracenyl-5,6-2H-benzimidazo[1,2-c]quinazoline (L) was obtained and characterized by elemental analysis, IR spectroscopy, 1H NMR and single-crystal X-ray diffraction. L shows very weak emission in DMSO, but can respond to Hg2+ ion intensively in off-on mode. Job's plot and titration experiments show that Hg2+ ion binds L in 1:1 stoichiometry. The detection limit for Hg2+ is 6.34 μM. 1H NMR titration experiments indicate that only one benzimidazo nitrogen atom coordinates with Hg2+. And the fluorescence emission spectra imply that an excimer formed in the Hg2+-L system, and the detection of Hg2+ was realized by excimer emission of anthracene moiety.
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