期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 169, 期 -, 页码 106-112出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.03.067
关键词
Lawsone; Cyanide sensors; Acetate sensors; Colorimetric sensors; Electrochemical sensors
资金
- United Negro College Fund Special Programs (UNCFSP) for NASA Astrobiology Program-Minority Institutions Research Support (NAP-MIRS)
- Homeland security grant [DHS 2008-ST-062-000011]
- National Science Foundation [NSF-HRD 0627276]
Lawsone (2-hydroxy-1,4-naphthoquinone), the essential component of henna, is used as a sensitive colorimetric and electrochemical sensor for anions such as cyanide, acetate, fluoride and dihydrogen phosphate (DHP) in acetonitrile. These anions cause a color change in Lawsone's solution from yellow to orange-red. Other anions, such as chloride, bromide, iodide, perchlorate, do not show a significant change. Cyanide changes the color of Lawsone in water:acetonitrile (95:5) solution significantly while acetate causes a slight color change. On the other hand, hydrogen sulfate anion fades the yellow color of the solution. Job's plots show a 1:1 host:guest complex in acetonitrile for cyanide, acetate and fluorides and 1:2 for DHP. In water/acetonitrile the stoichiometry is 1:1 for host:anion. The binding constants show strong binding with cyanide and acetate in both solvent systems. (C) 2012 Published by Elsevier B.V.
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