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A novel indolium salt as a rapid colorimetric probe for cyanide detection in aqueous solution

Dan Wen, Xuankai Deng, and Yanhua Yu

Institute for Interdisciplinary Research, Jianghan University, Wuhan, China



Received: 14 July 2020  Accepted: 19 September 2020


In this study, a new chemosensor IDTTH for rapid detection of cyanide (CN) based on 6,6,12,12-Tetrakis(4-hexylphenyl)-6,12-dihydrodithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]di- thiophene-2,8-dicarboxaldehyde-hemicyanine conjugate has been developed. The 6,6,12,12-tetrakis(4-hexylphenyl)-6,12-dihydrodithi-eno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene was served as a signal unit and hemicyanine as a recognition unit. This probe shows high selectivity towards CN ions among tested anions. Addition of CN ions to probe IDTTH in semi-aqueous solution (acetonitrile/H2O = 1/1, V/V) could lead to a 195 nm blue shift of absorption band, together with colour changes from blue to yellow. The sensing mechanism is attributed to the nucleophilic addition between CN and the C=N bond of indolium group, which could be clearly clarified through the 1H NMR titration and MS spectral. Moreover, probe IDTTH could be used as the test strips with low cost to detect CN ions conveniently by naked eyes.

Keywords: Cyanide detection; Colorimetric probe; Indolium salt; Test strips

Full paper is available at

DOI: 10.1007/s11696-020-01371-3


Chemical Papers 75 (3) 1095–1102 (2021)

Tuesday, June 18, 2024

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