Synthesis and photophysical properties of fluorescent arylstyrylimidazo[1,2-a]pyridine-based donor-acceptor chromophores
作者:Zeynel Seferoğlu、Heiko Ihmels、Ertan Şahin
DOI:10.1016/j.dyepig.2014.09.016
日期:2015.2
temperature. The styryl derivatives absorb in the UV or visible region and emit light with moderate Stokes shifts. These compounds exhibit fluorosolvatochromism, namely the emission band is red shifted with increasing solvent polarity. Moreover, the absorption and emission properties of the styryl derivatives change drastically upon acidification, as the protonation of the nitrogen atoms of the imidazo[1
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。