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Conjugated Schiff base; chemosensor; colorimetric; mercury.

A novel conjugated Schiff base-based chemosensor DAP, N^¢-((1E,2E)-3-(4-(dimethylamino) phenyl)allylidene)-3-nitrobenzohydrazide, has been synthesized. DAP showed significant selectivity toward mercury ion by color change of pale yellow to orange. Detection limit was 0.11 lM, which is lowerthan the value (2.48 lM) recommended by Health Canada. DAP could recognize and quantify mercury ion in real water samples. The binding mode of DAP and Hg²⁺ was demonstrated, based on Job plot, IR spectra and ESI-MS.

AHRAN KIM SEHOON KIM CHEAL KIM¹

1. Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul 129-743, South Korea

Published

4 July 2020

Manuscript received

31 January 2019

Manuscript revised

Accepted

7 March 2020