A colorimetric and fluorescent chemical sensor N1 based on o-tolidine was designed and synthesized, which can be used as an efficient colorimetric and fluorescent sensor for CN−. Compared to other common anions, the color of N1 solution was observed from yellow to colorless after the addition of CN−, while under UV lamp the yellow fluorescence of N1 was clearly annihilated. In addition, the detection limit on fluorescence response of N1 for CN − was down to 4.43 × 10–7 M. 1H NMR titration suggested that the ICT process occurred between N1 and CN−, and the reaction ratio was 1:2. N1 was successfully used to detect cyanide content in bitter almonds, and N1-based test strips were also produced, which could more conveniently and effectively detect the CN− in aqueous solution.
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Published in Zhurnal Prikladnoi Spektroskopii, Vol. 87, No. 5, pp. 832–838, September–October, 2020.
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Ni, PW., Yao, Y., Fu, QQ. et al. Highly Selective Colorimetric and Fluorescent Chemosensor for CN− Based on o-Tolidine. J Appl Spectrosc 87, 904–910 (2020). https://doi.org/10.1007/s10812-020-01087-y
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DOI: https://doi.org/10.1007/s10812-020-01087-y