A novel colorimetric and fluorometric probe L1 for detecting CN⁻ with high selectivity was constructed and synthesized based on intramolecular charge transfer (ICT). Remarkably, L1 was found to be exclusively responsive to CN⁻ via nucleophilic attack of dicyanovinyl group via ¹H NMR titration experiment. The detection system exhibited “turn-on” fluorescence with the addition of cyanide, which was opposite to previously reported fluorescence quenching probes with the same sensing process. Moreover, the detection limit of L1 for CN⁻ was determined to be 1.1 μM, lower than the standard (1.9 μM) regulated by the World Health Organization (WHO). This work demonstrated that L1 could serve as both a colorimetric and a fluorimetric sensor for cyanide detection in pure water, making it possible for the applications of cyanide detection in water.

一种新颖的比色和荧光探针L1，用于检测CN ^-以高选择性构建和基于分子内电荷转移（ICT）合成。值得注意的是，L1被认为是排他地响应于CN ^-通过经由二氰基乙烯基团的亲核攻击^1个1 H NMR滴定实验。该检测系统显示出带有氰化物的“开启”荧光，这与先前报道的具有相同感测过程的荧光猝灭探针相反。此外，CN ^- L1的检出限被确定为1.1μM，低于世界卫生组织（WHO）规定的标准（1.9μM）。这项工作表明，L1既可以用作纯水中氰化物检测的比色传感器也可以用作荧光传感器，从而可以用于水中氰化物检测的应用。