Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5219618 | Tetrahedron | 2012 | 8 Pages |
A novel fluorosensor for anions, 1,11-bis(4-methylcoumarin-7-yl)-6-methyl-1,3,6,9,11-pentaazaundeca-2,10-dione (L), which contains two coumarin-urea units spaced by a flexible diethylenetriamine fragment, was easily prepared in 65% yield by a one-pot two-step procedure. The binding ability of L toward several anions (G) was evaluated by 1H NMR, UV-vis, and fluorescence titration. It was found that L forms stable [LG] and [LG2] species in both DMSO and CH3CN solvents. Furthermore, the fluorescence emission of L in the visible range (400Â nm) is affected by the presence of anions; it is quenched by acetate, chloride, and pyrophosphate while it is enhanced by fluoride. Thus, this novel fluorosensor provides a selective off-on response to the presence of fluoride in solution.
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