Munusamy Sathishkumar, Swaminathan Sathish, Jothi Dhanapal, Muralidharan Vivek Panyam, Iyer Sathiyanarayanan Kulathu
Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology Vellore-632014 India
RSC Adv. 2021 Apr 27;11(26):15656-15662. doi: 10.1039/d1ra01213d. eCollection 2021 Apr 26.
A highly selective, novel BINOL based sensor BBCN has been developed for the fluorescent ratiometric detection of cyanide ions (CN). The optical study revealed that BBCN exhibited unique spectral changes only with cyanide ions in the presence of other competing ions. Besides, an apparent fluorescent colour change from green to blue was observed. A clear linear relationship was observed between the fluorescence ratiometric ratio of BBCN and the concentration of CN with a reasonably low detection limit (LOD) of 189 nM (507 ppb). The optical response was due to the nucleophilic addition of CN to the dicyanovinyl group of the sensor, which compromises the probe's intramolecular charge transfer. This mechanism was well confirmed by Job's plot, H-NMR and ESI-MS studies. BBCN showed immediate spectral response towards (1 second) CN and detection could be realized in a broad pH window. Furthermore, the practical utility of BBCN was studied by test paper-based analysis and the detection of CN in various water resources.
一种基于新型联萘酚的高选择性传感器BBCN已被开发用于氰离子（CN）的荧光比率检测。光学研究表明，在存在其他竞争离子的情况下，BBCN仅与氰离子呈现独特的光谱变化。此外，观察到明显的荧光颜色从绿色变为蓝色。在BBCN的荧光比率与CN浓度之间观察到清晰的线性关系，检测限（LOD）相当低，为189 nM（507 ppb）。光学响应是由于CN对传感器的二氰基乙烯基进行亲核加成，这损害了探针的分子内电荷转移。Job曲线、氢核磁共振（H-NMR）和电喷雾电离质谱（ESI-MS）研究很好地证实了这一机制。BBCN对CN显示出即时光谱响应（1秒），并且可以在较宽的pH范围内实现检测。此外，通过基于试纸的分析以及对各种水资源中CN的检测研究了BBCN的实际应用。
