Department of Chemistry, Iowa State University, Ames, IA 50011, USA.
Phys Chem Chem Phys. 2011 Jan 28;13(4):1338-44. doi: 10.1039/c0cp00353k. Epub 2010 Nov 16.
Herein we report the synthesis of two solution processible, conjugated polymers containing the benzobisoxazole moiety. The polymers were characterized using (1)H NMR, UV-Vis and fluorescence spectroscopy. Thermal gravimetric analysis shows that the polymers do not exhibit significant weight loss until approximately 300 °C under nitrogen. Cyclic voltammetry shows that the polymers have reversible reduction waves with estimated LUMO levels at -3.02 and -3.10 eV relative to vacuum and optical bandgaps of 2.04-2.17 eV. Devices based on blends of the copolymers and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) exhibited modest power conversion efficiencies. Theoretical models reveal that there is poor electron delocalization along the polymer backbone, leading to poor performance. However, the energy levels of these polymers indicate that the incorporation of benzobisoxazoles into the polymer backbone is a promising strategy for the synthesis of new materials.
在此，我们报告了两种可溶液处理的含有苯并恶唑部分的共轭聚合物的合成。使用 (1)H NMR、UV-Vis 和荧光光谱对聚合物进行了表征。热重分析表明，聚合物在氮气下直至约 300°C 才开始出现明显的重量损失。循环伏安法表明，聚合物具有可逆的还原波，相对于真空的最低未占据分子轨道 (LUMO) 能级约为-3.02 和-3.10 eV，光学带隙为 2.04-2.17 eV。基于共聚物和 [6,6]-苯基 C61 丁酸甲酯 (PCBM) 共混物的器件表现出适度的功率转换效率。理论模型表明，聚合物主链上的电子离域性较差，导致性能不佳。然而，这些聚合物的能级表明，将苯并恶唑引入聚合物主链是合成新材料的一种有前途的策略。
