Add time:08/13/2019         Source:sciencedirect.com

We developed a curcumin-based chemosensor (DCD) for selective and efficient detection of Picric acid (PA). The developed chemosensor DCD exhibit a broad emission band at 516 nm and shows green colour fluorescence in DMSO/H2O solution (8:2, v/v) due to the more conjugations of its double bonds. Upon binding with PA, the fluorescence intensity of DCD was dramatically quenched in the presence of other aromatic nitro compounds due to the disruption of conjugation. Using Benesi-Hildebrand plot, the binding constant value of DCD with PA was calculated to be 4 × 10−2 M. The chemosensor DCD shows perfect linearity up to 250 μM with a detection limit of 11 × 10−8 M. The binding stoichiometry ratio between DCD and PA was calculated to be 1:1 by Job's plot analysis. In addition, the DFT study also confirms the binding mechanism of DCD with PA.

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