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首页> 外文期刊>RSC Advances >Highly sensitive turn-off fluorescent detection of cyanide in aqueous medium using dicyanovinyl-substituted phenanthridine fluorophore
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Highly sensitive turn-off fluorescent detection of cyanide in aqueous medium using dicyanovinyl-substituted phenanthridine fluorophore

机译：使用二氰乙烯基取代的菲荧光荧光团的水性介质中氰化物的高灵敏度关闭荧光检测

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摘要

Herein, the turn-off fluorescence sensor of 2-((4′-(7,8,13,14-tetrahydrodibenzo[ a , i ]phenanthridin-5-yl)-[1,1′-biphenyl]-4-yl)methylene)malanonitrile ( 7 ) was developed for the recognition of CN ~(?) ions and studied using different spectroscopic techniques. The selective recognition of CN ~(?) ions by 7 was investigated via UV-vis spectroscopy and fluorescence studies in acetonitrile solvent, which exhibited an obvious color change from orange to colorless under 365 UV light. The sensor compound 7 possesses a high binding constant ( K _(a) ) for CN ~(?) ions in the order of 5.22 × 10 ~(6) M ~(?1) . The results from the interference studies revealed that probe 7 shows high sensing selectivity and sensitivity for CN ~(?) ions over other competitive anions. Probe 7 interacts with cyanide to form a 1?:?1 adduct, and this mechanism was further verified by ~(1) H NMR titration, Job's plot analyses and DFT studies. The sensor probe 7 exhibits advantages such as low limit of detection (LOD) of 39.3 nM, fast response and sensing in a wide pH range of 3 to 11. The practical application of 7 was successfully demonstrated for the determination of CN ~(?) ions in test paper strips and various water samples.
机译：在此，2 - （（4' - （7,8,13,14-四氢苯并二苯并二苯胺-5-y1） - [1,1'-Biphenyl] -4-y1的关闭荧光传感器）亚甲基亚腈（7）被开发用于识别CN〜（α）离子并使用不同的光谱技术研究。通过UV-Vis光谱和乙腈溶剂中的荧光研究研究了CN〜（α）离子的选择性识别，从乙腈溶剂中的荧光研究表现出从橙色到无色365 uV光的明显颜色变化。传感器化合物7具有用于CN〜（α）离子的高结合常数（K _（a）），大约为5.22×10〜（6）m〜（Δ1）。来自干扰研究的结果揭示了探针7在其他竞争阴离子上显示了CN〜（？）离子的高感测选择性和灵敏度。探针7与氰化物相互作用以形成1？：1加合物，并进一步验证〜（1）H NMR滴定，作业的情节分析和DFT研究进一步验证。传感器探头7表现出39.3nm的检测限（LOD）的优点，宽的pH范围为3-11的较快响应和感测。7的实际应用成功地证明了CN〜（？）的测定测试纸条和各种水样中的离子。

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