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Issue 26, 2012
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A new ratiometric and colorimetric chemosensor for cyanide anion based on Coumarin–hemicyanine hybrid

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Abstract

A hybrid coumarin–hemicyanine dye, Cou-BT, was developed as a new ratiometric and colorimetric sensor for cyanide with a sensing mechanism via nucleophilic addition of cyanide anion to the benzothiolium group. Cou-BT shows high sensitivity and selectivity for cyanide detection over other common anion species in aqueous acetonitrile solution. The calculated pseudo-first-order rate constant for cyanide anion addition was (2.13 ± 0.08) × 10−2 s−1 at 298 K, and the detection limit was estimated to be 0.64 μM. The DFT and TDDFT calculation results suggest that the ratiometric and colorimetric sensing behavior of Cou-BT upon its reaction with cyanide was due to the interrupted π-conjugation and blocked ICT progress.

Graphical abstract: A new ratiometric and colorimetric chemosensor for cyanide anion based on Coumarin–hemicyanine hybrid

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Publication details

The article was received on 01 Feb 2012, accepted on 14 May 2012 and first published on 14 May 2012


Article type: Paper
DOI: 10.1039/C2OB25516B
Citation: Org. Biomol. Chem., 2012,10, 5073-5076
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    A new ratiometric and colorimetric chemosensor for cyanide anion based on Coumarin–hemicyanine hybrid

    Z. Yang, Z. Liu, Y. Chen, X. Wang, W. He and Y. Lu, Org. Biomol. Chem., 2012, 10, 5073
    DOI: 10.1039/C2OB25516B

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