共价有机骨架(COFs)具有良好的化学稳定性,柔性化学官能化,可调孔径,和高比表面积已经越来越多地用于荧光传感领域。在这项工作中,结晶乙烯基官能化COFTzDa-V通过室温合成方法通过4,4'之间的缩合反应容易地制备,4″-(1,3,5-三嗪-2,4,6-三基)三苯胺(Tz)和2,5-二烯丙基氧基对苯二甲醛(Da-V)。分子间电荷转移(ICT)效应赋予TzDa-V荧光特性,它对痕量水很敏感,由于水破坏了ICT过程,因此可以淬灭。在这个基础上,将制备的具有优异化学/热稳定性的COFTzDa-V应用于DMF等常见有机溶剂中痕量水的传感,丙酮,THF,和快速响应(小于10s)的乙酸乙酯,令人满意的传感范围(DMF中0.5-18%的水,在丙酮中0.5-15%水,0.5-16%水的THF溶液,0.5-5%的乙酸乙酯溶液,v/v),和高灵敏度。DMF中水的检出限,丙酮,THF,乙酸乙酯为0.0497%,0.059%,0.0502%,和0.0766%(v/v),分别。所提出的探针已成功用于检测盐和糖等食品中的痕量水。COFTzDa-V将是在水传感中应用的良好候选者。
Covalent organic frameworks (COFs) with good chemical stability, flexible chemical functionalization, tunable pore sizes, and high specific surface areas have been increasingly employed in the field of fluorescence sensing. In this work, a crystalline vinyl-functionalized COF TzDa-V was facilely prepared through a room-temperature synthetic method via condensation reaction between 4,4\',4″-(1,3,5-triazine-2,4,6-triyl)trianiline (Tz) and 2,5-diallyloxyterephthalaldehyde (Da-V). The intermolecular charge transfer (ICT) effect endowed the TzDa-V with fluorescence characteristic, and it was sensitive to trace water and can be quenched due to the disruption of ICT process by water. On this base, the prepared COF TzDa-V with excellent chemical/thermal stability was applied to sensing of trace water in common organic solvents such as DMF, acetone, THF, and ethyl acetate with rapid response (less than 10 s), satisfactory sensing range (0.5-18% water in DMF, 0.5-15% water in acetone, 0.5-16% water in THF, 0.5-5% in ethyl acetate, v/v), and high sensitivity. The limits of detection for water in DMF, acetone, THF, and ethyl acetate were 0.0497%, 0.0590%, 0.0502%, and 0.0766% (v/v), respectively. The proposed probe was successfully used for the detection of trace water in food products such as salt and sugar. The COF TzDa-V would be a good candidate for application in water sensing.