Browsing by Author "TG, A.K."

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    Selective colorimetric chemosensor for the detection of Hg2+ and arsenite ions using Isatin based Schiff's bases
    (DFT Studies and Applications in test strips) TG, A.K.; Tekuri, V.; Mohan, M.; Trivedi, D.R.
    10.1016/j.snb.2018.12.003
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    Selective colorimetric chemosensor for the detection of Hg2+ and arsenite ions using Isatin based Schiff's bases; DFT Studies and Applications in test strips
    (Elsevier B.V., 2019) TG, A.K.; Tekuri, V.; Mohan, M.; Trivedi, D.R.
    Three isatin appended Schiff's base chemosensors (CS1-CS3) were synthesized and characterized by FT-IR, 1H-NMR, 13 C-N MR, and LC–MS. The sensing ability of the synthesized chemosensors towards Hg2+ and AsO2? ions was established through colorimetric / UV–vis techniques and achieved detection limit at ppm levels. All chemosensors CS1-CS3 exhibited rapid colorimetric / UV–vis response with Hg2+, also, CS1 and CS3 displayed dual-ion selectivity towards AsO2? (colour changes orange to aqua-blue) and Hg2+ (from orange to colorless). The binding properties and detection limit has been examined through the UV–vis instrument. The mechanism of binding was investigated using various analytical techniques like FT-IR, UV–vis, mass and 1H-NMR titration experiments. The experimental results were supported by theoretical DFT study. The developed colorimetric chemo-sensors showed a good binding affinity towards metal ions and exhibited good linearity (R2 ? >0.99). Further, the developed sensors were used for test strips application to detect the Hg2+, AsO2? ions and achieved naked-eye detection at ppm levels. Hence, CS1-CS3 sensors find its practical application in efficient detection of toxic metals like Hg2+ and AsO2?. © 2018 Elsevier B.V.