Controlled Regioregularity in Oligo(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylenes
作者:Xinju Zhu、Kyle N. Plunkett
DOI:10.1021/jo501266g
日期:2014.8.1
repetitive Horner–Wadsworth–Emmons (HWE) reactions of precisely substituted aryl rings with four different substituents. The resulting oligomers were characterized by nuclear magnetic resonance spectroscopy (NMR), cyclic voltammetry (CV) and absorption spectroscopy in solution and in thin films. Each of the oligomers gave discrete 1H and 13C NMR spectra. The regioregular pentamer (2) displayed the most resolution
一系列的2-甲氧基-5-(2'-乙基己氧基)五聚体3个衍生物的- p -phenylenevinylenes(2 - 4),具有不同程度的侧链区域规则性,制备。使用具有四个不同取代基的精确取代的芳基环的重复Horner-Wadsworth-Emmons(HWE)反应进行低聚化学反应。通过溶液和薄膜中的核磁共振波谱(NMR),循环伏安法(CV)和吸收波谱对所得的低聚物进行表征。每个低聚物给出不连续的1 H和13 C NMR光谱。区域规则的五聚体(2)在信号之间显示出最高分辨率,表明这些核比区域随机五聚体(3和4)驻留在更独特的化学环境中。发现每种新的低聚物的溶液相电子(CV)和吸收性质基本相同。相反,薄膜吸收光谱不相等。区域规则性更强的五聚体(2和3)具有新的红移的肩部结构,这表明即使在五聚体水平上,堆积顺序也受到侧链区域规则性的严重影响。