Substituent Effect on AIE mechanism of two coumarin derivatives: uncommon TICT fluorescence in aggregation state
作者:Qiao Li、Yang Zhao、Zhigang Niu、Enju Wang
DOI:10.1007/s10895-022-02933-2
日期:2022.7
properties and aggregation-induced emission (AIE) activities, but the AIE characteristics of them were entirely different. HNC exhibited an AIE phenomenon as the result of the restriction of twisted intramolecular charge transfer (TICT), while DNC emitted peculiar dual fluorescence which was assigned to the emission based on the inhibition of TICT state formation and the emission from the TICT state respectively
通过水杨醛衍生物与 4-硝基苯乙腈的 Knoevenagel 缩合合成两种香豆素衍生物,7-二乙氨基-3-(4-硝基苯基)香豆素 (DNC) 和 7-羟基-3-(4-硝基苯基)香豆素 (HNC),然后环化反应。它们都通过单晶X射线衍射进行了表征。DNC的分子通过π-π相互作用堆积,而在HNC的晶体堆积中观察到氢键相互作用而不是π-π相互作用。DNC和HNC均表现出溶剂致变色特性和聚集诱导发射(AIE)活性,但它们的AIE特性完全不同。由于扭曲的分子内电荷转移 (TICT) 的限制,HNC 表现出 AIE 现象,