State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P.R. China.
University of Chinese Academy of Sciences, Beijing, 100864, P.R. China.
Chemistry. 2018 Sep 3;24(49):13043-13048. doi: 10.1002/chem.201802496. Epub 2018 Jul 27.
Organoboron chemistry is a new tool to tune the electronic structures and properties of conjugated polymers, which are important for applications in organic optoelectronic devices. To investigate the effects of substituents of boron atoms on conjugated polymers, we synthesized three conjugated polymers based on double B←N-bridged bipyridine (BNBP) with various substituents on the boron atoms. By changing the substituents from four phenyl groups and two phenyl groups/two fluorine atoms to four fluorine atoms, the BNBP-based polymers show blue-shifted absorption spectra, decreased LUMO/HOMO energy levels, and enhanced electron affinities, as well as increased electron mobilities. Moreover, these BNBP-based polymers can be used as electron acceptors for all-polymer solar cells. These results demonstrate that substituents of boron atoms can effectively modulate the electronic properties and applications of conjugated polymers.
硼有机化学是一种新的工具，可以调整共轭聚合物的电子结构和性质，这对于有机光电设备的应用非常重要。为了研究硼原子取代基对共轭聚合物的影响，我们合成了三种基于双 B←N 桥联联吡啶（BNBP）的共轭聚合物，这些聚合物的硼原子上具有不同的取代基。通过将取代基从四个苯基和两个苯基/两个氟原子变为四个氟原子，基于 BNBP 的聚合物表现出吸收光谱蓝移、降低 LUMO/HOMO 能级和增强电子亲和力以及增加电子迁移率。此外，这些基于 BNBP 的聚合物可用作全聚合物太阳能电池的电子受体。这些结果表明，硼原子的取代基可以有效地调节共轭聚合物的电子性质和应用。
