Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 4, Pages 2133-2138Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am3001083
Keywords
chemodosimeter; cyanide; reaction-based; intramolecular charge transfer; colorimetric; high selectivity
Funding
- National Science Foundation of China [20974084]
- National Fundamental Key Research Program [2011CB932702]
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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 mu M. 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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