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Robust, sensitive and facile method for detection of F−, CN− and Ac− anions.

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Title: Robust, sensitive and facile method for detection of F−, CN− and Ac− anions.
Authors: Madhusudhana Reddy, P.1, Hsieh, Shih-Rong2, Chen, Jem-Kun3, Chang, Chi-Jung1 changcj@fcu.edu.tw, Kang, Jing-Yuan1, Chen, Chih-Hsien1
Source: Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy. Nov2017, Vol. 186, p8-16. 9p.
Subjects: Intermediates (Chemistry), Ions, Anions, Chemical detectors, Nitrophenyl compounds
Abstract: Sensing of F − , CN − and Ac − is important from the viewpoint of both medically and environmentally. Particularly, sensing of the anions in 100% water by a colorimetric chemical sensor is a highly difficult task as water molecules interfere the sensing mechanism. In this regard, sensor R1, having azo and nitrophenyl groups as signaling units and thiourea as a binding site was prepared. This sensor exclusively detected CN − ion over other testing anions in 30% aq. DMSO solution by exhibiting distinct spectral and visual color changes. However, in 15% aq. DMSO solution, R1 exhibited obvious spectral and color changes in response to F − , CN − and Ac − . On the other hand, we have also designed sensor, R2, having same signaling units of R1, but a different binding site of urea group. Surprisingly, in contrast to R1, R2 exhibited obvious spectral and color changes in 5% aq. DMSO solution only. Further, economically viable “test stripes” were prepared in a facile mode to detect the CN − in 100% aqueous solution. Such stripes can serve as a practical colorimetric probe for “in the field” detection of the ions and thus avoid additional expensive equipment. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Sensing of F − , CN − and Ac − is important from the viewpoint of both medically and environmentally. Particularly, sensing of the anions in 100% water by a colorimetric chemical sensor is a highly difficult task as water molecules interfere the sensing mechanism. In this regard, sensor R1, having azo and nitrophenyl groups as signaling units and thiourea as a binding site was prepared. This sensor exclusively detected CN − ion over other testing anions in 30% aq. DMSO solution by exhibiting distinct spectral and visual color changes. However, in 15% aq. DMSO solution, R1 exhibited obvious spectral and color changes in response to F − , CN − and Ac − . On the other hand, we have also designed sensor, R2, having same signaling units of R1, but a different binding site of urea group. Surprisingly, in contrast to R1, R2 exhibited obvious spectral and color changes in 5% aq. DMSO solution only. Further, economically viable “test stripes” were prepared in a facile mode to detect the CN − in 100% aqueous solution. Such stripes can serve as a practical colorimetric probe for “in the field” detection of the ions and thus avoid additional expensive equipment. [ABSTRACT FROM AUTHOR]
ISSN:13861425
DOI:10.1016/j.saa.2017.06.004