Metal-free C(3)–H arylation of coumarins promoted by catalytic amounts of 5,10,15,20-tetrakis(4-diethylaminophenyl)porphyrin
作者:Masahiro Kojima、Kounosuke Oisaki、Motomu Kanai
DOI:10.1039/c5cc02349a
日期:——
Metal-free, Meerwein-type C(3)–H arylation of coumarins was achieved in the presence of catalytic amounts of 5,10,15,20-tetrakis(4-diethylaminophenyl)porphyrin.
Rational design of slightly twisted coumarin molecules with remarkable solution and solid dual efficient luminescence
作者:Yue Sun、Tong Wu、Fang Zhang、Rong Zhang、Min Wu、Yuezhen Wu、Xiaozhong Liang、Kunpeng Guo、Jie Li
DOI:10.1016/j.dyepig.2017.09.060
日期:2018.2
boosted the luminescence efficiency of CM1-CM3 in solution and the solid state simultaneously. Eventually, compound CM2 with an ethoxyl substitute exhibited the strongest blue emission with fluorescence quantum yields as high as 73.2% and 96.7% in solution and the solid state, respectively. This work presents an efficient strategy towards dual strong fluorescent luminophores in both solution and the solid
赋予在溶液和固态中都高度发射的轻微扭曲的分子对于理解使发光体的发光效率最大化的原理非常重要。为此,合成了在7位具有不同烷氧基取代基的一系列轻微扭曲的香豆素发光体CM s。研究了替代物对四种化合物在溶液,THF / H 2 O混合物和固态中的多样性光物理性质的影响。与参考化合物CM(3- p-tolyl-2H-chromen-2-one)的引入,即引入的富含电子的烷氧基取代基不但没有增强分子内电荷转移(ICT)的作用,而且还显着改变了其在晶体中的分子堆积模式。增加辐射和抑制非辐射路径的综合效果同时提高了溶液和固态中CM1 - CM3的发光效率。最终,具有乙氧基取代基的化合物CM2表现出最强的蓝色发射,在溶液和固态下的荧光量子产率分别高达73.2%和96.7%。这项工作提出了解决方案在固态和固态的双重强荧光发光体的有效策略。