Suzuki Jumpei, Ishizone Akira, Sato Kosuke, Imai Hiroaki, Tseng Yu-Jen, Peng Chi-How, Oaki Yuya
Department of Applied Chemistry , Faculty of Science and Technology , Keio University , 3-14-1 Hiyoshi, Kohoku-ku , Yokohama 223-8522 , Japan . Email:
Department of Chemistry , National Tsing Hua University , Hsinchu 30013 , Taiwan.
Chem Sci. 2020 Jun 10;11(27):7003-7008. doi: 10.1039/d0sc01757d. eCollection 2020 Jul 21.
The organization states of functional molecules have a significant impact on the properties of materials. A variety of approaches have been studied to obtain well-organized molecular assemblies. The present work shows a new non-organized state of isolated and dispersed functional molecules in amorphous flexible covalent organic networks. Redox-active quinone molecules are embedded in the amorphous network polymers. Consecutive reactions between benzoquinone (BQ) and linker molecules generate random network structures through polymerization at different rates and in multiple directions. The low-crystalline stackings of the amorphous network polymers facilitate the formation of nanoflakes through exfoliation in dispersion media. Enhanced electrochemical performances, one of the highest specific capacities in recent studies, were achieved by efficient redox reactions of the quinone moiety. The present noncrystalline approach, low-crystalline stacking of designer amorphous covalent organic networks, can be applied to construct similar nanostructured polymer materials containing functional units.
功能分子的组织状态对材料的性能有重大影响。人们已经研究了多种方法来获得有序的分子组装体。目前的工作展示了一种在无定形柔性共价有机网络中孤立和分散的功能分子的新无序状态。氧化还原活性醌分子嵌入无定形网络聚合物中。苯醌（BQ）与连接分子之间的连续反应通过不同速率和多个方向的聚合产生随机网络结构。无定形网络聚合物的低结晶堆积有利于在分散介质中通过剥离形成纳米片。通过醌部分的有效氧化还原反应实现了增强的电化学性能，这是近期研究中最高的比容量之一。目前的非晶态方法，即设计的无定形共价有机网络的低结晶堆积，可用于构建包含功能单元的类似纳米结构聚合物材料。
