ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
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 www.springerlink.com.
Chemical Papers 75 (3) 1095–1102 (2021)