Wang Shu, Zhou Enhui, Wei Xuemei, Liu Ruanhui, Li Changjiang, Pan Le, Zheng Yuchuan, Xing Nannan
College of Chemistry and Chemical Engineering, Huangshan University, Huangshan 245041, P. R. China.
ACS Omega. 2022 Jun 2;7(23):20241-20249. doi: 10.1021/acsomega.2c02172. eCollection 2022 Jun 14.
A silver nanocluster fluorescent probe was synthesized by using the pyridinium-based ionic liquid [Cpy][DCA] as the protective agent, AgNO as the precursor, and NaBH as the reducing agent. The presence of pyridine group enhanced the fluorescence intensity of Ag nanoclusters and facilitated the coordination interaction between Ag nanoclusters and AsO . Therefore, the collaborative construction of a silver nanocluster probe using the pyridinium-based ionic liquid [Cpy][DCA] offered outstanding selectivity and sensitivity to detect AsO in water. More interestingly, the fluorescent probe quenched by AsO could be recovered with the addition of HO. This fluorescent probe provided a rapid and superior method for the detection of As(III) in the linear concentration range of 0-60 ppb with the lowest detection limit of 0.60 ppb. The mechanism of fluorescence quenching was a static quenching, considered to be due to electron migration between functional groups on the surface of Ag nanoclusters constructed with [Cpy][DCA] and AsO .
以吡啶基离子液体[Cpy][DCA]为保护剂、AgNO为前驱体、NaBH为还原剂合成了一种银纳米簇荧光探针。吡啶基团的存在增强了银纳米簇的荧光强度，并促进了银纳米簇与AsO之间的配位相互作用。因此，使用吡啶基离子液体[Cpy][DCA]协同构建的银纳米簇探针对水中AsO的检测具有出色的选择性和灵敏度。更有趣的是，被AsO淬灭的荧光探针可通过添加HO恢复。该荧光探针为检测0-60 ppb线性浓度范围内的As(III)提供了一种快速且优越的方法，最低检测限为0.60 ppb。荧光淬灭机制为静态淬灭，被认为是由于用[Cpy][DCA]构建的银纳米簇表面官能团与AsO之间的电子迁移所致。
