Covalent organic frameworks (COFs) are appealing for electrochromic (EC) application due to their designable redox-active building blocks, ordered porous structure, and well-developed π-π stacking structure, which greatly enhance the generation and transportation of carriers for EC switching. However, such EC COFs are rare and still dominated by two-dimensional network topology till now. Herein, a bis(triphenylamine)-based one-dimensional (1D) COF, termed as TAPD-TDA COF, was reported and the EC performance of the COF film directly grown on indium tin oxide (ITO) coated glass was systematically studied. Theoretical and experimental results indicated that TAPD-TDA COF possessed 1D covalent and π-π stacking structure, with comparatively high crystallinity and Brunauer-Emmett-Teller surface area. Furthermore, the characterization of the oriented COF film demonstrated that the film on ITO glass was uniform and exhibited reversible color transition between bright yellow and light grey during the applied cyclic potentials. Significantly, in the redox process, it displays remarkable absorption spectral changes in the near-infrared region, which is ascribed to the active degree of intervalence charge transfer (IVCT) effect between bis(triphenylamine) cation radicals within the COF skeleton. The absorption wavelength of the COF film linearly shifts between 1060 and 940 nm with the applied potentials. Undoubtedly, this work on a novel 1D COF might shed light on further exploration/application in smart optoelectronic materials.

共价有机框架 (COF) 因其可设计的氧化还原活性构件、有序的多孔结构和发达的 π-π 堆叠结构而在电致变色 (EC) 应用中具有吸引力，这极大地增强了用于 EC 转换的载流子的生成和传输. 然而，这种 EC COF 很少见，直到现在仍然以二维网络拓扑为主。本文报道了一种基于双（三苯胺）的一维（1D）COF，称为TAPD-TDA COF，并系统地研究了直接在氧化铟锡（ITO）镀膜玻璃上生长的COF薄膜的EC性能。理论和实验结果表明，TAPD-TDA COF具有一维共价和π-π堆积结构，具有较高的结晶度和Brunauer-Emmett-Teller表面积。此外，定向COF薄膜的表征表明，ITO玻璃上的薄膜是均匀的，并且在施加的循环电位期间表现出在亮黄色和浅灰色之间的可逆颜色转变。值得注意的是，在氧化还原过程中，它在近红外区域显示出显着的吸收光谱变化，这归因于COF骨架内双（三苯胺）阳离子自由基之间的间隔电荷转移（IVCT）效应的活跃程度。COF 薄膜的吸收波长随着施加的电位在 1060 和 940 nm 之间线性变化。毫无疑问，这项关于新型一维 COF 的工作可能有助于进一步探索/应用智能光电材料。