An ICT-based chemodosimeter for selective dual channel sensing of cyanide in an aqueous solution. Issue 20 (14th May 2018)

• Record Type: Journal Article
• Authors: Raja Lakshmi, P.; Manivannan, R.; Jayasudha, P.; Elango, Kuppanagounder P.
• Is Part Of: Analytical methods. Volume 10:Issue 20(2018)
• Page Start: 2368
• Page End: 2375
• Publication Date: 2018-05-14
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/c8ay00818c
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : The chemodosimeter senses cyanide in an aqueous solution via dual channel mode through nucleophilic addition, which blocks π-conjugation and ICT transition. Abstract : Herein, using intramolecular charge transfer (ICT) transition as a signaling mechanism, a quinoline–benzothiazolium hybrid was designed, synthesized, and developed as a dual channel (colorimetric/turn-on fluorometric) sensor for cyanide in aq. HEPES buffer/DMF (70 : 30 v/v; pH 7.2). This receptor can detect cyanide with very high selectivity and instantaneous response. The mechanism of sensing involves nucleophilic addition of CN − to the C atom of the CN bond of benzothiazolium moiety. This irreversible addition blocks the π-conjugation and ICT transition between quinoline and benzothiazolium moieties and consequently alters the colour and spectral properties. The results of electronic, fluorescence, and 1 H & 13 C NMR spectral studies corroborated well with those of the DFT calculations.