Abstract
A novel di-Schiff base colorimetric sensor, 2-((E)-(((E)-anthracen-9-ylmethylene)hydrazineylidene)methyl)quinolin-8-ol (coded as AQ), connecting anthracene and 8-hydroxyquinaldehyde functionalities is developed for the naked eye detection of Hg2+ ions in HEPES buffered CH3OH: H2O (7: 3) solvent system within neutral pH range. The sensor witnessed high selectivity towards Hg2+ ions in the presence of various other metal ions with naked eye colour change from yellow to pink. The quantitative detection limit of 220 nM was achieved through UV–Vis spectroscopy. The change in the intramolecular charge transfer behaviour of AQ has been proposed to be responsible for the observed absorption as well as colour change as evident from 1H NMR titration, FT-IR studies and DFT calculations. Moreover, the probe AQ has been efficiently applied for the solid state naked eye detection of Hg2+ ions in the form of filter paper strips and solid silica gel (60–120 mesh), pre-impregnated with AQ, and for the detection of Hg2+ ions in real water samples.
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