A fluorescent imidazophenazine-based derivative (S) has been successfully synthesised, and can be used as a chemsensor for relay recognition of CN^– in DMSO/H₂O (7 : 3, v/v) solution, which exhibited external stimuli-responsiveness. The sensor immediately responded with obvious colour changes (from red to purple) and fluorescent quenching when CN^– was added to the S solution. Its detection limit for CN^– is 2.16 × 10⁻⁷ M. In addition, NMR spectroscopy and density function theory calculations were also used to confirm the recognition mechanism. In particular, the fluorescence responding circle could be repeated three times by the sequential addition of CN^– and CH₃COO^– or CN^– and HSO₄^–. Moreover, a CN^– detection test paper was prepared using S, providing a convenient method for CN^– identification.

一种基于咪唑吩嗪的荧光衍生物（S）已经成功合成，可以用作DMSO / H ₂ O（7：3，v / v）溶液中CN ^–的中继识别的化学传感器，该溶液表现出外部刺激反应性。该传感器立即用明显的颜色变化（从红色到紫色）和荧光淬灭反应，当CN ^-加入到小号溶液。其对CN ^–的检出限为2.16×10 ^-7M。此外，还使用NMR光谱和密度泛函理论计算来确认识别机理。特别地，通过依次添加CN，可以将荧光响应圈重复3次。^–和CH ₃ COO ^–或CN ^–和HSO ₄ ^–。此外，CN ^-检测试纸使用制备小号，为CN的便利方法^-鉴定。