V-Shaped 4,6-Bis(arylvinyl)pyrimidine Oligomers: Synthesis and Optical Properties
作者:Sylvain Achelle、Ines Nouira、Bernd Pfaffinger、Yvan Ramondenc、Nelly Plé、Julián Rodríguez-López
DOI:10.1021/jo900107u
日期:2009.5.15
were studied in different solvents and media. The materials display strong emission solvatochromism that is reflected by a large red shift in their fluorescence emission maxima on increasing the solvent polarity. This change is accompanied by a successive decrease in fluorescence intensity. This behavior suggests a highly polar emitting state, which is characteristic of compounds that undergo an internal
通过4,6-二甲基嘧啶与适当的芳族醛之间的醛醇缩合,已经有效地制备了一系列V形4,6-双(芳基乙烯基)嘧啶。当使用树枝状的第一代聚苯撑乙烯撑醛时,该方法也被证明是成功的。此外,还可以通过以受控方式逐步引入臂来获得不对称官能化的分子。在不同的溶剂和介质中研究了这些系统的光吸收和发射特性。该材料显示出很强的发射溶剂致变色现象,在增加溶剂极性时,其荧光发射最大值出现了大的红移,从而反映了这种现象。这种变化伴随着荧光强度的连续降低。这种现象表明发射极是高极性的,这是激发时经历内部电荷转移的化合物的特征。这些分子用作比色和发光pH传感器的能力通过引入酸后显着的颜色变化和发光转换得到证明。