卤素
荧光
分子间力
猝灭(荧光)
化学
苯
光化学
聚集诱导发射
分子
Atom(片上系统)
有机化学
烷基
计算机科学
嵌入式系统
物理
量子力学
作者
Jiajun Xu,Meifen Huang,Siman Zhang,Dan Ning,Haijun Pang,Liang Ji,Qiuling Yang,Jing Yang,Qiong Wu
标识
DOI:10.1016/j.saa.2023.123415
摘要
Fluorescence probes based on the variations of aggregation state (Aggregation-Induced Emission (AIE) and Aggregation-Caused Quenching (ACQ)) have received widespread attention due to their simplicity, efficiency and intuitiveness. However, typical probes are highly sensitive to changes in polarity and slight variations in the external environment can cause a complete change in the aggregation state. With the aim of expanding the detection range of the molecular probe, this work adopts a different design strategy from adjusting the molecular backbone but regulates the fluorescence behavior of the Schiff base molecular backbone by introducing different halogen atoms. Systematic studies show that when chlorine serves as substitutional atoms (3,5-Cl Salen), the probe can achieve full-range detection of water content (0-100 vol%) in ethanol and DMF. To our knowledge, the 3,5-Cl Salen represents the best water content probe in organic molecules. Experimental and theoretical studies have shown that the adjustment of halogen atoms can linearly change the charge distribution on the benzene ring and precisely control the strength of intermolecular interactions. At the same time, we developed a fluorescent filter paper based on 3,5-Cl Salen and used smartphones for rapid, sensitive and precise on-site measurement of water content in organic solvents.
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