The synthesis, characterization and optical properties of novel pyrido[1,2-a]benzimidazole derivatives
作者:Yan Qing Ge、Jiong Jia、He Yang、Xu Tang Tao、Jian Wu Wang
DOI:10.1016/j.dyepig.2010.08.005
日期:2011.3
absorbance and fluorescence spectra of the pyrido[1,2-a]benzimidazoles were measured in dichloromethane; an intense absorption maxima was observed at 250 nm and emission maxima were noted at 460 nm. The absorption spectra and fluorescence characteristics of the pyrido[1,2-a]benzimidazole derivatives revealed that a phenyl and a methyl group attached to the pyrido[1,2-a]benzimidazole ring markedly influenced
使用2-酰基苯并咪唑衍生物和4-溴丁-2-烯酸酯在温和的条件下进行新型串联环化反应,合成了一系列新颖的取代的吡啶并[1,2- a ]苯并咪唑衍生物。使用IR,1 H NMR,13 C NMR和HRMS对化合物进行表征。确定2,7,8-三甲基-3-乙氧基羰基-4-苯基吡啶并[1,2- a ]苯并咪唑的晶体结构为正交晶。在二氯甲烷中测定吡啶并[1,2- a ]苯并咪唑的吸光度和荧光光谱。在250 nm处观察到强烈的吸收最大值,在460 nm处观察到发射最大值。吡啶并[1,2- a]的吸收光谱和荧光特性]苯并咪唑衍生物表明,连接在吡啶并[1,2- a ]苯并咪唑环上的苯基和甲基明显影响最大发射。