Novel fluorescent 4-alkynyl coumarins were rapidly and efficiently synthesized by Sonogashira coupling of readily accessible coumaryl triflates. The photophysical properties of the predominantly highly fluorescent compounds were experimentally studied by absorption and fluorescence spectroscopy and their electronic structure was rationalized by DFT and TD-DFT calculations using the PBEh1PBE functional
通过容易获得的香豆基
三氟甲磺酸钠的Sonogashira偶联快速有效地合成了新型的荧光4-炔基
香豆素。通过吸收和荧光光谱对主要为高荧光化合物的光物理性质进行了实验研究,并通过使用PBEh1PBE官能团的DFT和TD-DFT计算合理化了其电子结构。通过Hammett-Taft相关性,建立了某些近邻序列的吸收和发射特性的结构-性质关系。最有趣的是,可以通过电子精细调节和调节潜在亚发色团的能级,并在光子激发下解决将供体取代基置于
染料的远端炔基末端的问题。