A new cyanide probe has been prepared by one-step synthesis and evaluated by UV–vis and fluorescent method. This probe is combined by a fluorene part and a hemicyanine group through a conjugated linker, which is found to show rapid response, high selectivity and sensitivity for cyanide anions with significant dual colorimetric and fluorescent signal changes in aqueous solution. An intramolecular charge transfer (ICT) effect plays a key role in the CN⁻ sensing properties, and the details of this mechanism are further supported by DFT and TD-DFT calculations. The theoretical study shows that the introduction of CN^- twists the original plane structure and blocks the ICT process in the whole molecule, which brings about the absorption blue-shift and the fluorescence quenching.

一种新的氰化物探针已通过一步合成制备，并通过紫外可见和荧光法进行了评估。该探针通过共轭接头与芴部分和半菁基团结合使用，发现该探针对氰化物阴离子具有快速的响应，高选择性和灵敏度，在水溶液中具有显着的双色度和荧光信号变化。分子内电荷转移（ICT）效应在该CN关键作用^-感应特性，而这个机制的细节由DFT和TD-DFT计算进一步支持。理论研究表明，引入CN的^-绞原平面结构和块整个分子，这带来的吸收蓝移和荧光猝灭在ICT过程。