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  • Title: Visual detection of cyanide ion in aqueous medium by a new chromogenic azo-azomethine chemosensor.
    Author: Li Z, Liu C, Wang S, Xiao L, Jing X.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2019 Mar 05; 210():321-328. PubMed ID: 30472595.
    Abstract:
    A simple and new chromogenic azo-azomethine chemosensor N'-(5-((2,4-dichloro- phenyl) diazenyl)-2-hydroxylbenzylidene) picolinohydrazide (L) has been synthesized as an effective colorimetric sensor for cyanide ion. The sensing behavior of the probe L towards CN- over other anions was examined by naked-eye, UV-vis spectroscopy and NMR studies. L exhibited a selective sensing ability to CN- in DMSO/H2O(6:4, v:v) binary solution and DMSO/Tris(10 mM, pH = 7.1, 6:4, v:v) buffer solution by changing color from colorless to yellow. The detection limit was calculated to be 6.4 μM. The recognition mechanism was attributed to deprotonation process according to 1H NMR titration method. Moreover, test strips coated with L were easily fabricated with low cost and could be used to detect CN- in aqueous solution conveniently.
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