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.

中文翻译：

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硼原子取代基对含B←N单元的共轭聚合物的影响

有机化学是调节共轭聚合物电子结构和性能的新工具，这对于有机光电器件中的应用很重要。为了研究硼原子取代基对共轭聚合物的影响，我们基于在硼原子上具有各种取代基的双B←N桥联吡啶（BNBP）合成了三种共轭聚合物。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的聚合物显示出蓝移的吸收光谱，降低的LUMO / HOMO能级，增强的电子亲和力以及增加的电子机动性。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。