一种强吸电子有机硼结构单元的二锡化单体：用于n型热电应用的受体-受体型共轭聚合物的制备
A Distannylated Monomer of a Strong Electron-Accepting Organoboron Building Block: Enabling Acceptor-Acceptor-Type Conjugated Polymers for n-Type Thermoelectric Applications.
作者信息
Dong Changshuai, Deng Sihui, Meng Bin, Liu Jun, Wang Lixiang
机构信息
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
University of Science and Technology of China, Hefei, 230026, P. R. China.
出版信息
Angew Chem Int Ed Engl. 2021 Jul 12;60(29):16184-16190. doi: 10.1002/anie.202105127. Epub 2021 Jun 15.
Acceptor-acceptor (A-A) copolymerization is an effective strategy to develop high-performance n-type conjugated polymers. However, the development of A-A type conjugated polymers is challenging due to the synthetic difficulty. Herein, a distannylated monomer of strong electron-deficient double B←N bridged bipyridine (BNBP) unit is readily synthesized and used to develop A-A type conjugated polymers by Stille polycondensation. The resulting polymers show ultralow LUMO energy levels of -4.4 eV, which is among the lowest value reported for organoboron polymers. After n-doping, the resulting polymers exhibit electric conductivity of 7.8 S cm and power factor of 24.8 μW m K . This performance is among the best for n-type polymer thermoelectric materials. These results demonstrate the great potential of A-A type organoboron polymers for high-performance n-type thermoelectrics.
受体-受体（A-A）共聚是开发高性能n型共轭聚合物的有效策略。然而，由于合成困难，A-A型共轭聚合物的开发具有挑战性。在此，一种具有强缺电子双B←N桥联联吡啶（BNBP）单元的二锡化单体很容易合成，并用于通过Stille缩聚反应开发A-A型共轭聚合物。所得聚合物显示出-4.4 eV的超低最低未占分子轨道（LUMO）能级，这是有机硼聚合物报道的最低值之一。经过n型掺杂后，所得聚合物表现出7.8 S cm的电导率和24.8 μW m K的功率因数。这种性能在n型聚合物热电材料中是最好的之一。这些结果证明了A-A型有机硼聚合物在高性能n型热电材料方面的巨大潜力。
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