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  • Title: Reaction-based colorimetric cyanide chemosensors: rapid naked-eye detection and high selectivity.
    Author: Cheng X, Zhou Y, Qin J, Li Z.
    Journal: ACS Appl Mater Interfaces; 2012 Apr; 4(4):2133-8. PubMed ID: 22387560.
    Abstract:
    Taking advantages of both the well-known azobenzene structure and the special nucleophilicity of cyanide toward the acceptor moiety, a new ratiometric colorimetric chemodosimeter (Azo-1) toward cyanide anion was designed and synthesized by using intramolecular charge transfer (ICT) as a signaling mechanism. Upon the addition of CN(-) anion, the probe displayed apparent color changes from deep red to light yellow, which could be observed by naked eyes. With the aid of the UV-vis spectrometer, the detection limit could be as low as 1.1 μM. The probe possessed high selectivity for cyanide with respect to other common anions. In addition, Azo-1 could serve as practical colorimetric probe for "in-the-field" measurements that would not require any additional equipment by virtue of "dip-sticks" approach.
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