Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, P. R. China.
Department of Ecology and Environment, Yuzhang Normal University, Nanchang 330103, P. R. China.
J Mater Chem B. 2022 Nov 16;10(44):9235-9248. doi: 10.1039/d2tb01828d.
A novel fluorescent sensor BTAE-PA containing two tetrarylethylene (TAE) units linked through pyrimidine-2-amine was prepared, and its optical properties were systematically studied. BTAE-PA exhibited a typical aggregation-induced emission enhancement behavior, and its fluorescent properties could be efficiently modulated by acid/base and metal ions in THF. The protonated effect could induce significant acidichromism and 'turn-on' near-infrared emission with a large Stokes shift (Δ = 225 nm). Furthermore, BTAE-PA was highly selective toward Al with significant absorption (yellow → orange) and fluorescence (green → red) changes. A Job's plot established the 1 : 1 stoichiometry of the complex formation between BTAE-PA and Al, and the limit of detection for Al was determined to be 1.30 × 10 mol L. Finally, we also demonstrated that BTAE-PA could be made into test paper strips for 'naked-eye' detection of acid/Al, and fluorescence imaging experiments proved that BTAE-PA is capable of achieving cell imaging with good biocompatibility. Therefore, the multi-stimuli-responsive and multicoloured display performance of BTAE-PA endows the material with potential applications in security ink, acid/Al sensing, and bio-imaging.
一种新型荧光传感器 BTAE-PA 被制备出来，它包含两个通过嘧啶-2-胺连接的四乙烯基（TAE）单元，并且对其光学性质进行了系统研究。BTAE-PA 表现出典型的聚集诱导发射增强行为，其荧光性质可以在 THF 中通过酸/碱和金属离子进行有效调节。质子化作用可以诱导显著的酸致变色和近红外发射“开启”，具有较大的斯托克斯位移（Δ=225nm）。此外，BTAE-PA 对 Al 具有高度选择性，伴随着显著的吸收（黄色→橙色）和荧光（绿色→红色）变化。Job 图确定了 BTAE-PA 与 Al 之间形成复合物的 1∶1 化学计量比，并且 Al 的检测限被确定为 1.30×10 mol L。最后，我们还证明了 BTAE-PA 可以制成用于“肉眼”检测酸/Al 的试纸条，荧光成像实验证明 BTAE-PA 能够实现具有良好生物相容性的细胞成像。因此，BTAE-PA 的多刺激响应和多色显示性能赋予了该材料在安全油墨、酸/Al 传感和生物成像方面的潜在应用。
