Abstract
A simple colorimetric chemosensor (E)-4((4-diethylamino)-2-hydroxybenzylidene)amino)-1,5-dimethyl-2-phenyl-1,2, dihydro-3H-pyrazole-3-one (M2) was synthesized and characterized by NMR, Mass spectra, IR and UV spectra, along with solvatochromism. The synthesized compound showed colorimetric sensing towards Hg2+ ion with high selectivity and sensitivity. The UV–Vis absorption spectra studies demonstrated that the proposed sensor could detect Hg2+ directly in acetonitrile solution over other metal ions. In the presence of Hg2+ ion, the probe exhibits instantaneous color change from colorless to yellow as a naked-eye detection. The binding ratio of the probe with metal has been identified to be of 1:1 using Job’s Plot and the obtained limit of detection is 8.83 × 10−8 M. The binding interaction of probe with the Hg2+ is confirmed using 1H NMR titration, ESI mass, and DFT calculation.
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