Synthesis and Optical Properties of Acidochromic Amine-Substituted Benzo[<i>a</i>]phenazines
作者:Prachi Singh、Abhishek Baheti、K. R. Justin Thomas
DOI:10.1021/jo200857p
日期:2011.8.5
transition between the amine and pyrazine segments and benzo[a]phenazine localized π–π* transitions. Although the absorption spectra of the dyes were not significantly influenced by the nature of the solvents, addition of TFA led to a prominent red-shift in the absorption spectra owing to the protonation at the quinoxaline segment which enhanced the electron-accepting ability. The qualitative trends
通过使用简单的连续迈克尔型与各种伯胺和仲胺的顺序加成反应以及所得胺取代的缩合反应,由1,2-萘醌合成了一系列新的烷基胺或芳胺取代的苯并[ a ]吩嗪类化合物。 1,2-萘醌与邻苯二胺。它们显示出吸收峰,该吸收峰源于胺和吡嗪链段与苯并[ a]之间的电荷转移跃迁。] phenazine局部化了π–π *跃迁。尽管染料的吸收光谱不受溶剂性质的影响,但由于喹喔啉段的质子化提高了电子接受能力,TFA的加入导致吸收光谱显着的红移。密度泛函理论计算支持了光学性质和酸致变色现象的定性趋势。染料在发射光谱中显示出正溶剂溶变色,表明存在更多极性的激发态。染料的特征还在于源自吡嗪链段的准可逆还原对,其经历了与胺链段的供电子强度相对应的变化。