Solvatochromic fluorescent styryl pyrene probes for the quantitative determination of water content in organic solvents
作者:Medena Noikham、Chawallak Sriwiphasathit、Khatcharin Siriwong、Tirayut Vilaivan
DOI:10.1016/j.dyepig.2022.110847
日期:2022.12
and 0–39.7% (v/v) in CH3CN. The limits of detection of water were established as low as 0.007%, 0.033%, and 0.036% (v/v) in THF, DMF, and CH3CN, respectively. Py-CHO showed somewhat higher limits of detection than Py-NO2 for the same solvents but exhibited a broad linear response to water content in EtOH between 3.3 and 63.6% (v/v) water content with the limit of detection at 2.350% (v/v). Thus, it
通过Wittig反应合成了一系列D-π-A荧光苯乙烯基芘探针。在苯环上引入吸电子取代基会形成一个推挽系统,该系统显示出溶剂依赖性分子内电荷转移 (ICT) 和溶剂致变色特性。其中,具有硝基(Py-NO 2 )和醛(Py-CHO)取代基的苯乙烯基芘探针对环境极性表现出显着的敏感性。它们分别在非极性到极性有机溶剂中显示出从绿色到红色和从蓝色到橙色的显着荧光变化。结果由 Lippert-Mataga 和E T解释(30)模型,由密度泛函理论(DFT)的理论计算支持。重要的是,Py-NO 2在有机溶剂中的荧光发射对THF中 0–34.2% (v/v)、DMF 中 0–9.1% (v/v) 和 0在 CH 3 CN中为 –39.7% (v/v) 。在 THF、DMF 和 CH 3 CN 中,水的检测限分别低至 0.007%、0.033% 和 0.036% (v/v) 。Py-CHO 的检测限比 Py-NO