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

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

作者机构：State Key Laboratory of Polymer Physics and ChemistryChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and EngineeringUniversity of Science and Technology of ChinaHefei 230026China 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学（英文版）)

年 卷 期：2023年第41卷第5期

页      面：832-838,I0012页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：financially supported by the National Natural Science Foundation of China(Nos.22135007,21875244 and 52073281) Jilin Scientific and Technological Development Program(No.YDZJ202101ZYTS138) 

主　　题：Cyano-substituted B←N unit Building block Narrow band gap D-A type conjugated polymers 

摘      要：The development of donor-acceptor(D-A)type conjugated polymers depends largely on the design of novel A building ***,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 *** addition,due to the greater impact of cyano substitution on LUMO than on HOMO,SBN-3 exhibits a reduced band gap,nearinfrared absorption and fluorescence *** 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 e V as well as distinctive electronic structures,i.e.,delocalized LUMOs and localized *** 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.