Synthesis and photophysical studies on 2‑styryl phenanthro[9,10‑d]oxazole derivatives
作者:Chinduluri Sravani、Mohsin Y. Lone、Prakash C. Jha、K.I. Sathiyanarayanan、Akella Sivaramakrishna
DOI:10.1016/j.saa.2018.10.055
日期:2019.3
state. Moreover, the addition of trifluoroacetic acid leads to a prominent blue-shift in visible and emission color changes owing to the protonation of the nitrogen atom of oxazole moiety. Among the all, the oxazolederivative having NMe2 group (3b) exhibits good response to acidic pH in the range of 3.0 to 5.6 with a good linearity upon decreasing the pH from 8.0 to 2.16. The absorption studies were
在乳酸存在下,9,10-菲咯醌与肉桂醛的缩合反应很容易制得一系列新的2-苯乙烯基菲并[ 9,10- d ]恶唑。所有这些苯乙烯基染料均以高收率分离,并通过各种分析和光谱技术进行了表征。一种含NO 2基团的染料(3d)通过单晶X射线分析进行结构表征。这些染料在蓝色到绿色区域显示发射,具有较大的斯托克斯位移值,这是取代基性质的特征。另外,通过增加溶剂极性观察到正溶剂溶变色趋势,表明极性激发态更稳定。而且,由于恶唑部分的氮原子的质子化,三氟乙酸的加入导致可见光和发射颜色变化的显着蓝移。其中,具有NMe 2基团的恶唑衍生物(3b)在pH值从8.0降至2.16时,对酸性pH值在3.0至5.6范围内具有良好的线性响应。吸收研究得到密度泛函理论计算的进一步支持。