期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 130, 期 36, 页码 12163-12167出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja8039025
关键词
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资金
- National Institutes of Health [GM 58907]
- Robert A. Welch Foundation [F-1018]
The benzil-cyanide reaction is a cyanide-specific reaction that has been exploited to produce a colorimetric indicator for this toxic anion. This was done by producing a pi-extended analogue of benzil, 7, which is soluble in a 70:30 (v/v) mixture of methanol-water. In this medium, dilute solutions of 7 are yellow but produce colorless products when exposed to low concentrations of cyanide anion (>= 1.7 mu M; added as an aqueous NaCN solution), but no other common anions (e.g., OH(-), F(-), N(3)(-), benzoate(-), and H(2)PO(4)(-)). On the basis of these observations and supporting mechanistic analyses, it is concluded that the modified benzil system 7 is a promising cyanide anion indicator that is attractive in terms of its selectivity, ease-of-use, water compatibility, and the low, naked-eye discernible cyanide detection limit it provides.
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