Oxygen ether chain containing covalent organic frameworks as efficient fluorescence-enhanced probe for water detection
作者:Yi Zhang、Jinjun Wu、Junkuo Gao、Xiaohu Chen、Qibiao Wang、Xianglin Yu、Zihe Zhang、Maosong Liu、Junbo Li
DOI:10.1016/j.jssc.2022.123727
日期:2023.2
stability. The fluorescence performance of the as-prepared COFs in acetonitrile showed that the longer the oxygen ether chain, the stronger the fluorescence intensity, this may be related to the inhibition of aggregation-caused quenching (ACQ) effect with the increase of interlayer spacing. The resulting COFs also exhibited different emission in different solvents, and their fluorescence intensity has
通过4,4',4''-( 1,3,5-三嗪-2,4,6-三基)三苯胺 (TPPA) 与 2,5-二甲氧基对苯二甲醛 (DTM)、2,5-双(2-甲氧基乙氧基)对苯二甲醛 (BMTP) 和 2,5-双(2-(2-甲氧基乙氧基)乙氧基)对苯二甲醛(BETP),分别具有高结晶度、大比表面积和高热化学稳定性。所制备的COFs在乙腈中的荧光性能表明,氧醚链越长,荧光强度越强,这可能与随着层间距的增加抑制聚集引起的猝灭(ACQ)效应有关。所得COF在不同溶剂中也表现出不同的发射,并且它们的荧光强度对有机溶剂中的水具有显着且快速的响应。其中,TPPA-DTM-COF显示出最稳定的荧光发射和在有机溶剂中的良好分散性。其荧光强度与乙腈中的水含量在0%~15%(V/V)范围内呈线性关系,经计算检出限为0.27%。此外,COF在乙醇、THF和DMF中的检出限分别为0.15%、0.43%和0.39%。TPPA-D