Isatin Hydrazone as a Colorimetric Chemosensor for the Selective Detection of Mercury (Hg2+)

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Janati Fatemeh; Hosseini Melika

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Journal Paper

Paper Information

Journal: ORGANIC CHEMISTRY RESEARCH Year:2023 | Volume:9 | Issue:1 Page(s): 67-73

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Title

Isatin Hydrazone as a Colorimetric Chemosensor for the Selective Detection of Mercury (Hg2+)

Author(s)

Janati Fatemeh | Hosseini Melika | Issue Writer Certificate

Keywords

Colorimetry

Chemosensor

Isatin

Selective mercury detection

Abstract

A highly sensitive and selective colorimetric chemosensor for Hg2+ ions was prepared by the use of the well-known isatin chromophore, hydrazine hydrate, and 4-hydroxybenzaldehyde. In EtOH solution, the synthesized adsorbent showed a visual color change from melon yellow to dark orange with a remarkably large red shift (75 nm) in the presence of Hg2+. This color change is due to the formation of a 1:1 metal-ligand complex. In complex, nitrogen atom of hydrazone group and oxygen atom of lactam group were coordinated to Hg2+, while the hydroxyl group on the phenyl ring plays an important role in color change. The detection limit of the synthesized colorimetric chemosensor for mercury ions was 1.8±0.2 μM. The H1 was synthesized as a colorimetric chemosensor based on isatin hydrazone and 4-hydroxy benzaldehyde for monitoring mercury ions. The H1 probe showed a high sensitivity to Hg2+ ions, that interact from its nitrogen and oxygen atoms against mercury cations, with a detection limit of 1.8±0.2 μM. In future research, we intend to modify the structure of isatin hydrazone so that it acts as a logic gate to detect two or more agents, showing different color changes.

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