

FOLLOWUS
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
liujun@ciac.ac.cn
Received:29 November 2022,
Revised:2022-12-22,
Accepted:26 December 2022,
Online First:02 March 2023,
Published:01 May 2023
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Liu, M. Y.; Shao, X. X.; Liu, J.; Wang, L. X. A cyano-substituted organoboron electron-deficient building block for D-A type conjugated polymers.Chinese J. Polym. Sci.2023,41, 832–838
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, 2023, 41(5): 832-838.
Liu, M. Y.; Shao, X. X.; Liu, J.; Wang, L. X. A cyano-substituted organoboron electron-deficient building block for D-A type conjugated polymers.Chinese J. Polym. Sci.2023,41, 832–838 DOI: 10.1007/s10118-023-2940-4.
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, 2023, 41(5): 832-838. DOI: 10.1007/s10118-023-2940-4.
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.
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.
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