State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (P. R. China).
Angew Chem Int Ed Engl. 2015 Mar 16;54(12):3648-52. doi: 10.1002/anie.201411973. Epub 2015 Feb 11.
The key parameters of conjugated polymers are lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) energy levels. Few approaches can simultaneously lower LUMO and HOMO energy levels of conjugated polymers to a large extent (>0.5 eV). Disclosed herein is a novel strategy to decrease both LUMO and HOMO energy levels of conjugated polymers by about 0.6 eV through replacement of a C-C unit by a B←N unit. The replacement makes the resulting polymer transform from an electron donor into an electron acceptor, and is proven by fluorescence quenching experiments and the photovoltaic response. This work not only provides an effective approach to tune the LUMO/HOMO energy levels of conjugated polymers, but also uses organic boron chemistry as a new toolbox to develop conjugated polymers with high electron affinity for polymer optoelectronic devices.
共轭聚合物的关键参数是最低未占据分子轨道（LUMO）和最高占据分子轨道（HOMO）能级。很少有方法可以同时将共轭聚合物的 LUMO 和 HOMO 能级大幅降低（>0.5 eV）。本文公开了一种通过用 B←N 单元取代 C-C 单元将共轭聚合物的 LUMO 和 HOMO 能级同时降低约 0.6 eV 的新策略。这种取代使所得聚合物从电子供体转变为电子受体，并通过荧光猝灭实验和光伏响应得到证实。这项工作不仅提供了一种有效调节共轭聚合物 LUMO/HOMO 能级的方法，而且还将有机硼化学用作开发具有高电子亲和力的共轭聚合物的新工具，用于聚合物光电设备。
