A novel thioketal containing fluorescent dye 1OS was elaborately designed for mercury(II) determination, which not only integrated the benefits of the remarkable specificity of Hg²⁺-promoted deprotection reaction and the robust emission of AIEgen in aggregated state, but also provided a surprising platform for ACQ-to-AIE switching, i.e. Hg²⁺-triggered ACQ to AIE transformation. Once encountered Hg²⁺ ions, the deprotection reaction happened immediately within seconds, accompanied with a conversion of 1OS (ACQ) to 1O (AIE). Excitedly, the probe shows remarkable selectivity and specificity towards Hg²⁺ both in solution, aggregated and solid states with significant fluorescence color change. When added trace Hg²⁺ ions into 1OS solution, its PL intensity declined completely with emission color changed from bright green to darkness with LOD as 0.36 μM. Oppositely, a “turn on” signal was achieved in the aggregated state (f_w = 98 %), which exhibited a dramatically enhancement of PL intensity along with fluorescent emission altered from darkness to brilliant yellow. Other common metal cations gave no interference to the probe. Meanwhile, the constructed test strip could “turn on” signify Hg²⁺ in water solution.

精心设计了一种用于汞(II)测定的新型硫缩酮荧光染料1OS ，它不仅结合了Hg ²⁺促进的脱保护反应的显着特异性和AIEgen在聚集态下的强劲发射的优点，而且还提供了令人惊讶的结果ACQ到AIE转换的平台，即Hg ²⁺触发ACQ到AIE转换。一旦遇到Hg ^{2+离子，几秒钟内立即发生脱保护反应，并伴随着}1OS (ACQ) 到1O (AIE)的转化。令人兴奋的是，该探针对溶液、聚集态和固态的Hg ^{2+均表现出显着的选择性和特异性，并具有显着的荧光颜色变化。}当向1OS溶液中添加微量Hg ²⁺离子时，其PL强度完全下降，发射颜色从亮绿色变为暗色，LOD为0.36 μM。相反，在聚集状态下实现了“开启”信号（fw =98%），其表现出PL强度_的 显着增强以及荧光发射从暗色变为亮黄色。其他常见金属阳离子对探针没有干扰。同时，构建的测试条可以“打开”表示水溶液中的Hg ^{2+ 。}