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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 11
BKCSDE 33(11)
November 20, 2012 

Teaching a Known Molecule New Tricks: Optical Cyanide Recognition by 2-[(9-Ethyl-9H-carbazol-3-yl)methylene]propanedinitrile in Aqueous Solution
Lijun Tang*, Guoyou Zhao, Nannan Wang
Cyanide, Recognition, Colorimetric, Fluorescence, Carbazole
The colorimetric and fluorescent cyanide recognition properties of 2-[(9-ethyl-9H-carbazol-3-yl)methylene]- propanedinitrile (1) in CH3CN-H2O (2/1, v/v, HEPES 10 mM, pH = 7.0) solution were evaluated. The optical recognition process of probe 1 exhibited high sensitivity and selectivity to cyanide ion with the detection limit of 2.04 × 10−6 M and barely interfered by other coexisting anions. The sensing mechanism of probe 1 is speculated to undergo a nucleophilic addition of cyanide to dicyanovinyl group present in compound 1. The colorimetric and fluorescent dual-modal response to cyanide makes probe 1 has a potential utility in cyanide detection.
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