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A new building block with intramolecular D-A character for conjugated polymers: ladder structure based on B←N unit

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Abstract

The general strategy to construct D-A type conjugated polymers is alternating copolymerization of electron-donating (D) monomer and electron-accepting (A) monomer. In this article, we report a new strategy to develop D-A type conjugated polymers, i.e. first fuse the D and A units into a polycyclic structure to produce a building block and then polymerize the building block with another unit. We develop a new building block with ladder structure based on B←N unit, B←N bridged dipyridylbenzene (BNDPB). In the skeleton of BNDPB, one diamine-substituted phenylene ring (D unit) and two B←N-linked pyridyl rings (A unit) are fused together to produce the polycyclic structure. Owning to the presence of intramolecular D-A character, the building block itself exhibits narrow bandgap of 1.74 eV. The conjugated polymers based on BNDPB show unique electronic structures, i.e. localized HOMOs and delocalized LUMOs, which are rarely observed for conventional D-A conjugated polymers. The polymers exhibit smaller bandgap than that of the building block BNDPB and display near-infrared (NIR) light absorption (λabs=ca. 700 nm). This study thus provides not only a new strategy to design D-A conjugated polymers but also a new kind of building block with narrow bandgap.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (21625403, 21822507, 21875244, 21761132020, 21574129), National Key Research and Development Program of China (2018YFE0100600) funded by MOST and Strategic Priority Research Program of CAS (XDB12010200). C. Dou thanks Youth Innovation Promotion Association of CAS (2017265) and State Key Laboratory of Supramolecular Structure and Materials in Jilin University (sklssm201905).

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Authors and Affiliations

  1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    Xingxin Shao, Chuandong Dou, Jun Liu & Lixiang Wang

  2. University of Science and Technology of China, School of Applied Chemistry and Engineering, Hefei, 230026, China

    Xingxin Shao, Jun Liu & Lixiang Wang

Authors
  1. Xingxin Shao
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  2. Chuandong Dou
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  3. Jun Liu
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  4. Lixiang Wang
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Correspondence to Chuandong Dou or Jun Liu.

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Shao, X., Dou, C., Liu, J. et al. A new building block with intramolecular D-A character for conjugated polymers: ladder structure based on B←N unit. Sci. China Chem. 62, 1387–1392 (2019). https://doi.org/10.1007/s11426-019-9518-7

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  • DOI: https://doi.org/10.1007/s11426-019-9518-7

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