Aniline oligomers have been widely used in many fields due to their excellent physicochemical properties. Owing to strong intermolecular interactions, their emission is always weakened or quenched when they are in high concentration or aggregated state, which greatly limits their fluorescent applications. Inspired by the concept of aggregation-induced emission (AIE), herein we introduced large steric groups onto the aniline oligomer to prevent the formation of packing structure. In particular, diphenyl vinyl group was bonded with oligomeric tetraaniline by a facile synthetic procedure with high yield. The obtained aniline oligomer derivative exhibited typical AIE features, which was also confirmed by density functional theoretical calculation. More importantly, this AIE oligomer was able to detect Fe3+ ions selectively and quantitatively. The fluorescence intensity decreased linearly along with the increment of Fe3+ concentration. Moreover, we demonstrated that this AIE oligomer could stain live bacteria, such as E. coli and S. aureus efficiently. All these results suggest that such a readily accessible and multifunctional tetraaniline derivative provides a new platform for the construction of fluorescent materials.
苯胺低聚物因其优异的物理
化学特性而被广泛应用于许多领域。由于分子间的强烈相互作用,当它们处于高浓度或聚集状态时,其发射总是被削弱或淬灭,这大大限制了它们的荧光应用。受聚集诱导发射(AIE)概念的启发,我们在
苯胺低聚物上引入了大的立体基团,以防止形成堆积结构。其中,二苯基
乙烯基与低聚物四
苯胺通过简便的合成程序以高产率结合在一起。得到的
苯胺低聚物衍
生物具有典型的 AIE 特性,密度泛函理论计算也证实了这一点。更重要的是,这种 AIE 低聚物能够选择性地定量检测 Fe3+ 离子。随着 Fe3+ 浓度的增加,荧光强度呈线性下降。此外,我们还证明了这种 AIE 低聚物能对大肠杆菌和
金黄色葡萄球菌等活细菌进行有效染色。所有这些结果表明,这种易于获得的多功能四
苯胺衍
生物为荧光材料的构建提供了一个新平台。