华南理工大学顾成团队开发了电子隔离策略设计持久稳定的多孔自由基聚合物。相关研究成果发表在2021年9月15日出版的《德国应用化学》。

具有稳定自由基特征的共轭有机自由基聚合物很难设计，因为聚合物主链中的π共轭使自由基容易离域，并倾向于经历共价键合过程。

该文中，研究人员报告了一种电子隔离策略，通过间位活性单体的均偶联反应设计稳定的多孔自由基聚合物。元键确保聚合物骨架中较少的共轭，定位共振自由基，并防止它们复合。所制备的多孔自由基聚合物表现出优异的自由基特性，具有0.68 eV的超低带隙、高达1800 nm的强紫外-可见-近红外吸收和高自旋密度。上述特性使得聚合物在光热转换方面非常有前景，光热温度升高约240℃，太阳能驱动的水蒸发效率达到96.8%。

研究结果证明了电子隔离自由基以生产优秀光热材料的可行性。

附：英文原文

Title: Design of Persistent and Stable Porous Radical Polymers by Electronical Isolation Strategy

Author: Yan Su, Zhongxin Chen, Xiaohui Tang, Hong Xu, Yujian Zhang, Cheng Gu

Issue&Volume: 2021-09-15

Abstract: Conjugated organic radical polymers with stable radical features are difficult to design because the π conjugation in the polymer backbones makes the radicals readily delocalize and tend to undergo covalent bonding processes. In this work, we report an electronical isolation strategy to design stable porous radical polymers by homocoupling reaction from a meta-position active monomer. The meta linkage ensures less conjugation in the polymer skeletons, localizes the resonant radicals, and prevent them from recombination. The resulting porous radical polymer exhibits exceptional radical characters with ultralow bandgap of 0.68 eV, strong yet extended UV-vis-NIR absorption up to 1800 nm, and high spin density. The above features make the polymer very promising in the photothermal conversion with record-high photothermal temperature increment of ~240 oC and striking solar-driven water evaporation efficiency of 96.8%. Our results demonstrate the feasibility of electronical isolation of radicals for producing outstanding photothermal materials.

DOI: 10.1002/anie.202108318

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202108318