A Cyano-Substituted Organoboron Electron-deficient Building Block for D-A Type Conjugated Polymers

Meng-Yu Liu; Xing-Xin Shao; Jun Liu; Li-Xiang Wang

doi:10.1007/s10118-023-2940-4

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A Cyano-Substituted Organoboron Electron-deficient Building Block for D-A Type Conjugated Polymers

RESEARCH ARTICLE | Updated：2023-04-21

- A Cyano-Substituted Organoboron Electron-deficient Building Block for D-A Type Conjugated Polymers
- Chinese Journal of Polymer Science Vol. 41, Issue 5, Pages: 832-838(2023)
- Affiliations：
  
  a.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  b.School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
- Author bio：
  
  liujun@ciac.ac.cn
- Funds：
- DOI：10.1007/s10118-023-2940-4
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Meng-Yu Liu, Xing-Xin Shao, Jun Liu, et al. A Cyano-Substituted Organoboron Electron-deficient Building Block for D-A Type Conjugated Polymers. [J]. Chinese Journal of Polymer Science 41(5):832-838(2023)
DOI：

Meng-Yu Liu, Xing-Xin Shao, Jun Liu, et al. A Cyano-Substituted Organoboron Electron-deficient Building Block for D-A Type Conjugated Polymers. [J]. Chinese Journal of Polymer Science 41(5):832-838(2023) DOI： 10.1007/s10118-023-2940-4.

摘要

In this work, a cyano-substituted organoboron unit with low LUMO/HOMO energy levels, near-infrared absorption and fluorescence properties is designed and synthesized. The D-A conjugated polymers based on the newly developed B←N unit with thiophene-based units show narrow optical band gaps of,ca,. 1.3 eV.

Abstract

The development of donor-acceptor (D-A) type conjugated polymers depends largely on the design of novel A building blocks. Herein, we report a novel A building block based on the cyano-substituted organoboron unit (,SBN-3,). Compared with the most common fluorine-substituted B←N unit,SBN-3,displays a significantly downshifted LUMO energy level because of the strong electron-withdrawing ability of cyano groups. In addition, due to the greater impact of cyano substitution on LUMO than on HOMO,SBN-3,exhibits a reduced band gap, near-infrared absorption and fluorescence properties. The D-A type conjugated polymers based on the cyano-substituted B←N unit with thiophene-based units show narrow optical band gaps of,ca,. 1.3 eV as well as distinctive electronic structures,i.e., delocalized LUMOs and localized HOMOs. This work thus provides not only an effective approach to design strong A units but also a new electron-deficient building block for D-A type conjugated polymers.

关键词

Keywords

Cyano-substitutedB←N unitBuilding blockNarrow band gapD-A type conjugated polymers

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