化学
硒
噻吩
共轭体系
硫黄
立体化学
结晶学
纳米技术
聚合物
有机化学
材料科学
作者
Hongxin Tao,Changquan Tang,Yunlong Ma,Shu‐Quan Zhang,Ruochuan Liaov,Qisheng Tu,Qingdong Zheng
标识
DOI:10.1002/cjoc.202300083
摘要
The development of novel building blocks with sp3-hybridized-carbon-free conjugated skeletons is important to further advance and enrich nonfullerene acceptors (NFAs), but this remains a challenge due to the lack of strategies to effectively modulate the aggregation behavior of resulting NFAs. Herein, two novel nitrogen-bridged octacyclic ladder-type heteroarenes end-capped with thiophene rings (BTPS) or selenophene rings (BTPSe) are designed and synthesized as the donor cores for constructing NFAs (MQX-2 and MQX-4). It is found that replacing the sulfur atoms (MQX-2) at the outer positions of the heteroarene core with selenium atoms (MQX-4) can effectively modulate the molecular packing mode of the NFAs. The incorporation of selenium atoms induces stronger O···Se noncovalent interaction than O···S, thus promoting the formation of mixed H/J-type aggregates in MQX-4. Benefiting from more electron hopping channels, MQX-4 exhibits higher electron transport (more than 1-fold enhancement) and photovoltaic properties compared to MQX-2, which forms only H-type aggregates. Appendix S1: Supporting Information Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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