Benzo[a]imidazo[5,1,2-cd]indolizines – a new class of molecules displaying excited state intramolecular proton transfer
作者:Anton J. Stasyuk、Marzena Banasiewicz、Barbara Ventura、Michał K. Cyrański、Daniel T. Gryko
DOI:10.1039/c3nj00842h
日期:——
2-(2′-hydroxyphenyl)imidazo[1,2-a]pyridines the new chromophores strongly absorb blue light and emit in the yellow part of the spectrum. In contrast to 2-(2′-hydroxyphenyl)imidazo[1,2-a]pyridines, emission of π-expanded dyes in protic solvents is usually weaker than in aprotic ones, where they exhibit large Stokes shifts (5500–7000 cm−1). Unlike in solution, in the solid state luminescence for benzo[a]imidazo[5,1
新的类ESIPT能力的分子,苯并[一个]咪唑并[5,1,2- CD ]中氮茚,轴承2-羟基苯基取代基被以简单的方式从咪唑并制备[1,2一]吡啶经由串联[8 + 2]环加成-[2 + 6 + 2]脱氢反应。通过与简单的类似物,即2-(2'-羟苯基)咪唑并[1,2- a ]吡啶进行比较,彻底阐明了结构与光物理性质之间的关系。与母体2-(2'-羟基苯基)咪唑并[1,2- a ]吡啶相比,新的生色团强烈吸收蓝光并在光谱的黄色部分发射。与2-(2'-羟基苯基)咪唑[1,2- a]吡啶,质子传递溶剂中π膨胀染料的发射通常弱于质子传递溶剂,后者表现出较大的斯托克斯位移(5500–7000 cm -1)。与溶液不同,在固态下,苯并[ a ]咪唑并[5,1,2- cd ]吲哚嗪的发光相对于相应的咪唑并[1,2- a ]吡啶的荧光平均偏移100 nm。导致相对强(Φ FL红光= 0.18〜0.27)的发射。具有甲氧基取代基的苯并[