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Sensors 2016, 16(3), 271; doi:10.3390/s16030271

A Highly Selective Sensor for Cyanide in Organic Media and on Solid Surfaces

1
Department of Chemistry, Morgan State University, Baltimore, MD 21251, USA
2
Department of Chemistry, Adnan Menderes University, Aydin 09010, Turkey
3
Department of Chemistry and Earth Sciences, Qatar University, P.O. Box 2713, Doha, Qatar
*
Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 12 January 2016 / Revised: 5 February 2016 / Accepted: 13 February 2016 / Published: 24 February 2016
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [3145 KB, uploaded 24 February 2016]   |  

Abstract

The application of IR 786 perchlorate (IR-786) as a selective optical sensor for cyanide anion in both organic solution (acetonitrile (MeCN), 100%) and solvent-free solid surfaces was demonstrated. In MeCN, IR-786 was selective to two anions in the following order: CN > OH. A significant change in the characteristic dark green color of IR-786 in MeCN to yellow was observed as a result of nucleophilic addition of CN to the fluorophore, i.e., formation of IR 786-(CN), which was also verified by a blue shift in the 775 nm absorbance peak to 430 nm. A distinct green fluorescence emission from the IR-786-(CN) in MeCN was also observed, which demonstrated the selectivity of IR-786 towards CN in MeCN. Fluorescence emission studies of IR-786 showed that the lower detection limit and the sensitivity of IR-786 for CN in MeCN was 0.5 μM and 0.5 to 8 μM, respectively. The potential use of IR-786 as a solvent-free solid state sensor for the selective sensing and monitoring of CN in the environment was also demonstrated. On solvent-free solid state surfaces, the sensitivity of the IR-786 to CN in water samples was in the range of 50–300 μM with minimal interference by OH. View Full-Text
Keywords: IR-786; anion sensing; cyanide sensing; cyanine dyes; near-infrared fluorophores; optical sensors; chemical sensors IR-786; anion sensing; cyanide sensing; cyanine dyes; near-infrared fluorophores; optical sensors; chemical sensors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Barare, B.; Babahan, I.; Hijji, Y.M.; Bonyi, E.; Tadesse, S.; Aslan, K. A Highly Selective Sensor for Cyanide in Organic Media and on Solid Surfaces. Sensors 2016, 16, 271.

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