Jiangsu Provincial Key Laboratory of Pulp and Paper Science & Technology, Nanjing Forestry University, Nanjing, China.
School of Textile Materials and Engineering, Wuyi University, Jiangmen, China.
Luminescence. 2023 Oct;38(10):1720-1728. doi: 10.1002/bio.4558. Epub 2023 Aug 2.
Multistimuli-responsive fluorescent materials have garnered great research interest benefited from their practical applications. Two twisted-structure compounds containing tetraphenylethylene (TPE) as the aggregation-induced emission (AIE) group and a pyridine unit as the acid reaction site to obtain new multistimuli-responsive fluorescent compounds (namely, TPECNPy: TPECNPy-2 and TPECNPy-3) were successfully synthesized through a one-step Knoevenagel condensation reaction. The multiple-stimuli response process of TPECNPy was investigated by means of photoluminescence (PL) spectra and emission colour. The results showed that both TPECNPy compounds with excellent AIE abilities displayed reversible emission wavelength and colour changes in response to multiple external stimuli, including grinding-fuming by CH Cl or annealing and HCl-NH vapour fuming. More importantly, fluorescent nanofibre films were prepared by electrospinning a solution of TPECNPy mixed with cellulose acetate (CA), and these exhibited reversible acid-induced discolouration, even with only 1 wt% TPECNPy. The results of this study may inspire strategies for designing multistimuli-responsive materials and preparing fluorescent sensing nanofibre films.
多重刺激响应荧光材料因其实际应用而受到广泛关注。通过一步克诺文格尔缩合反应，成功合成了两种含有四苯乙烯（TPE）作为聚集诱导发射（AIE）基团和吡啶单元作为酸反应位点的扭曲结构化合物，得到了新型多重刺激响应荧光化合物（即 TPECNPy：TPECNPy-2 和 TPECNPy-3）。通过光致发光（PL）光谱和发射颜色研究了 TPECNPy 的多重刺激响应过程。结果表明，两种具有优异 AIE 能力的 TPECNPy 化合物均表现出对多种外部刺激的可逆发射波长和颜色变化的响应，包括 CHCl 研磨冒烟或退火和 HCl-NH 蒸气冒烟。更重要的是，通过静电纺丝将 TPECNPy 与醋酸纤维素（CA）混合的溶液制备了荧光纳米纤维膜，这些膜表现出可逆的酸诱导变色，即使 TPECNPy 的含量仅为 1wt%。这项研究的结果可能为设计多重刺激响应材料和制备荧光传感纳米纤维膜提供策略。
