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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 Hg2+ in semi‐aqueous media. The probe exhibits a typical absorption band at 519 nm upon interaction with Hg2+, which is responsible for remarkable color change from yellow to pink. The detection limit of Py‐KS for the analysis of Hg2+ was found to be 4.73×10−7 M. The binding modes of interaction of Py‐KS with Hg2+ have been determined by Job's plot which exhibits 2:1 (Py‐KS: Hg2+) ratio, and further confirmed with 1H NMR titration and FT‐IR analysis. The association constant of Py‐KS‐Hg2+ complex was found as 1.2×103 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 Hg2+ in real sample analysis.

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