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Issue 33, 2019
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A new ratiometric, colorimetric and ‘‘turn-on’’ fluorescent chemosensor for the detection of cyanide ions based on a phenol–bisthiazolopyridine hybrid

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Abstract

A novel C2-symmetric ratiometric fluorescence and colorimetric cyanide (CN) sensor 1 based on a phenol–bisthiazolopyridine hybrid was synthesized and characterized. Among the various screened anions, this chromogenic receptor 1 showed only a distinct visible color change from colorless to yellow and blue to green fluorescence toward CN in both pure methanol and aqueous methanol. The ‘‘turn-on’’ ratiometric fluorescence (emission shift = 95 nm) and colorimetric (absorbance shift = 45 nm) detection of CN can be attributed to the deprotonation of the OH groups of 1, as evidenced by OH and 1H NMR experiments. The binding mode of 1 with CN was determined to be a 1 : 1 stoichiometry through a Job plot. Probe 1 was also highly sensitive (LOD = 75 nM) as measured by ratiometric fluorescence (I420/I515 nm) methods. Moreover, the reversibility of the deprotonated 1 by HCl in both solution and the solid state (TLC paper test strips) was successful. In general, probe 1 is a promising CN indicator in terms of its ease-of-use, selectivity, sensitivity, rapid response (<1 s), reversibility and test kit application.

Graphical abstract: A new ratiometric, colorimetric and ‘‘turn-on’’ fluorescent chemosensor for the detection of cyanide ions based on a phenol–bisthiazolopyridine hybrid

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Publication details

The article was received on 09 Jun 2019, accepted on 23 Jul 2019 and first published on 23 Jul 2019


Article type: Paper
DOI: 10.1039/C9NJ02863C
New J. Chem., 2019,43, 13001-13009

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    A new ratiometric, colorimetric and ‘‘turn-on’’ fluorescent chemosensor for the detection of cyanide ions based on a phenol–bisthiazolopyridine hybrid

    N. Assadollahnejad, M. Kargar, H. R. Darabi, N. Abouali, S. Jamshidi, A. Sharifi, K. Aghapoor and H. Sayahi, New J. Chem., 2019, 43, 13001
    DOI: 10.1039/C9NJ02863C

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