合成了一系列新颖的荧光芳基苯乙烯基咪唑并[1,2-a]吡啶,并对其进行了充分表征。如1 H NMR光谱法明确显示的,所有苯乙烯基衍生物具有乙烯基双键的E-构型。观察到,E异构体在固态下是稳定的。然而,具有强供电子二烷基氨基取代基的衍生物经历了部分E - Z在室温下在溶液中异构化。苯乙烯基衍生物在紫外线或可见光区域吸收并发出中等斯托克斯位移的光。这些化合物表现出氟溶剂变色,即发射带随着溶剂极性的增加而红移。而且,由于咪唑并[1,2-a]吡啶环的氮原子的质子化增加了π系统的供体-受体相互作用,因此,苯乙烯基衍生物的吸收和发射性质在酸化后会急剧变化。
A series of new fluorescent arylstyrylimidazo[1,2-a]pyridines was synthesized and fully characterized. It is observed that the E isomers are stable in the solid state and in solutions. The absorption and emission properties of the compounds changed drastically upon acidification. The compounds showed good thermal stability for practical applications. In addition, antimicrobial, antioxidant, and DNA-cleavage activity of the compounds were examined. The results indicate that the compounds did not show any antimicrobial and antioxidant activity. However, they caused decreased mobility of form I DNA and also showed DNA cleavage activity. (C) 2015 Elsevier B.V. All rights reserved.