作者:Pengfei Li、Shanpeng Wen、Weidong Cheng、Jibo Zhang、Shiyu Yao、Bin Xu、Wenjing Tian
DOI:10.1039/c2nj40194k
日期:——
A series of poly(p-phenylenevinylene) based polymers (MEH-OXD-PPVs) functionalized with Y-shaped double 1,3,4-oxadiazole-containing side chains were synthesized through a modified Gilch reaction. They are all soluble in common organic solvents such as chloroform, tetrahydronfuran and 1,1,2,2-tetrachloroethane. The chemical structures of MEH-OXD-PPVs were determined by 1H NMR, GPC and elemental analysis. Thermogravimetric analysis shows that they have good thermal stability with the decomposition temperature ranging from 312 °C to 326 °C. The absorption and fluorescence emission maxima of the polymers exhibit an appreciable blue-shift with the increase of oxadiazole-containing moieties. Electrochemical investigation shows that the HOMO energy levels of the polymers vary regularly with the change of content of oxadiazole-containing moieties. Additionally, by introducing more OXD-PV unit during copolymerization, the PL quantum efficiencies of the polymers are significantly enhanced compared to that of MEH-PPV. The successful manipulation of optical and electronic properties of the MEH-OXD-PPVs indicates an effective concept for developing PPV-based functional materials with tunable optoelectronic properties by changing the amount of electron-withdrawing oxadiazole-containing moieties.
一系列基于聚(p-苯撑乙烯)的聚合物(MEH-OXD-PPVs)通过改良的Gilch反应合成,这些聚合物的侧链进行了Y形双1,3,4-恶二唑结构的功能化。它们在常见有机溶剂中,如氯仿、四氢呋喃和1,1,2,2-四氯乙烷中均可溶解。MEH-OXD-PPVs的化学结构通过1H NMR、GPC和元素分析进行了确定。热重分析表明,它们具有良好的热稳定性,分解温度范围为312 °C至326 °C。随着含恶二唑单元的增加,聚合物的吸收和荧光发射最大值表现出明显的蓝移。电化学研究显示,聚合物的HOMO能级随着含恶二唑单元含量的变化而规律性变化。此外,通过在共聚合过程中引入更多的OXD-PV单元,与MEH-PPV相比,聚合物的PL量子效率显著提高。成功调控MEH-OXD-PPVs的光学和电子性质表明,通过改变电子吸引性恶二唑单元的含量,可以为开发具有可调光电性质的基于PPV的功能材料提供有效的概念。