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 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China [2]School of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Journal of Polymer Science》2023年第5期832-838,I0012,共8页高分子科学（英文版）

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)。

摘　　要：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,nearinfrared 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 e V 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：Cyano-substituted B←N unit Building block Narrow band gap D-A type conjugated polymers 

分 类 号：O631.5[理学—高分子化学]