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A Pyrazole‐Based Highly Selective Colorimetric Chemosensor for Hg 2+ Ion in Semi‐Aqueous Medium
Author(s) -
Karuppusamy P.,
Senthilvelan J.,
Vijayakumar V.,
Sarveswari S.
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201903109
Subject(s) - chemistry , reagent , titration , knoevenagel condensation , detection limit , aqueous solution , aqueous medium , pyrazole , chromogenic , analytical chemistry (journal) , proton nmr , absorption (acoustics) , nuclear chemistry , stereochemistry , chromatography , inorganic chemistry , materials science , organic chemistry , catalysis , composite material
In this study, a pyrazole‐based ( Py‐KS) chemosensor was successfully designed and synthesized via Knoevenagel condensation and utilized as a colorimetric chemosensor for selective determination of Hg 2+ in semi‐aqueous media. The probe exhibits a typical absorption band at 519 nm upon interaction with Hg 2+ , which is responsible for remarkable color change from yellow to pink. The detection limit of Py‐KS for the analysis of Hg 2+ was found to be 4.73×10 −7 M. The binding modes of interaction of Py‐KS with Hg 2+ have been determined by Job's plot which exhibits 2:1 ( Py‐KS: Hg 2+ ) ratio, and further confirmed with 1 H NMR titration and FT‐IR analysis. The association constant of Py‐KS ‐Hg 2+ complex was found as 1.2×10 3 M −1 using Benesi‐Hildebrand method. The probe could be recyclable after appropriate treatment with the reagents such as EDTA. Moreover, the designed probe Py‐KS has successfully demonstrated for the detection of Hg 2+ in real sample analysis.