Sun Ruixue, Feng Shengyu, Zhou Bingyan, Chen Zixu, Wang Dengxu, Liu Hongzhi
National Engineering Technology Research Center for Colloidal Materials & Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, P. R. China.
ACS Macro Lett. 2020 Jan 21;9(1):43-48. doi: 10.1021/acsmacrolett.9b00901. Epub 2019 Dec 19.
The construction of porous polymers linked by flexible building units has been considered a great challenge. Here, we address this challenge by using flexible 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxanes to react with brominated pyrene, tetraphenylethene, and spirobifluorene via the Heck reaction, resulting in three cyclosiloxane-linked fluorescent porous polymers. The materials exhibit high porosity, strong fluorescence, and tunable emission colors. Such properties impart the promise of these polymers as candidates for multifunctional chemical sensors to identify latent fingerprints with a strong anti-interference ability under actual conditions (e.g., rainy environment) and to detect nitroaromatic explosives and metal ions, especially 2,4,6-trinitrotoluene or picric acid, and the Fe ion, with low limits of detection and a high selectivity. Moreover, a paper sensor was further developed and is found to be sensitive to the solution, solid, and vapor phases of explosives and the Fe ion, complete with a rapid response time and visual detection. These results may open up new horizons for exploring porous polymers, particularly those with a strong fluorescence, based on flexible linkers.
通过柔性结构单元连接的多孔聚合物的构建一直被认为是一项巨大挑战。在此，我们通过使用柔性的2,4,6,8-四甲基-2,4,6,8-四乙烯基环四硅氧烷，使其经由Heck反应与溴化芘、四苯乙烯和螺二芴反应，从而应对这一挑战，得到了三种环硅氧烷连接的荧光多孔聚合物。这些材料具有高孔隙率、强荧光和可调节的发射颜色。这些特性使这些聚合物有望成为多功能化学传感器的候选材料，能够在实际条件下（如雨天环境）以强抗干扰能力识别潜在指纹，并检测硝基芳香族炸药和金属离子，特别是2,4,6-三硝基甲苯或苦味酸以及铁离子，具有低检测限和高选择性。此外，还进一步开发了一种纸质传感器，发现它对炸药和铁离子的溶液、固相和气相都敏感，具有快速响应时间和可视化检测功能。这些结果可能为探索基于柔性连接体的多孔聚合物，特别是那些具有强荧光的聚合物开辟新的前景。
