Feng Ji-Fei, Liu Tian-Fu, Cao Rong
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China.
Angew Chem Int Ed Engl. 2020 Dec 7;59(50):22392-22396. doi: 10.1002/anie.202006926. Epub 2020 Oct 7.
Hydrogen-bonded organic frameworks (HOFs) possess various merits, such as high porosity, tunable structure, facile modification, and ready regeneration. These properties have yet to be explored in the context of new functional HOF materials. The facile and inexpensive electrophoretic deposition (EPD) method applied in this study generated a transparent HOF film at room temperature in just 2 min and is applicable to other HOFs. The resulting film exhibited reversible electrochromism with the advantage of long cycle life (>500 cycles). More strikingly, this all-organic film could be readily regenerated (through rinsing with DMF and redeposition) and showed tunable electrochromic behavior (through low-cost postsynthetic modification) with the ability to undergo successive color changes, which is difficult to achieve with conventional electrochromic materials. An electrochromic device was manufactured to further demonstrate the application potential of the film.
氢键有机框架（HOFs）具有多种优点，如高孔隙率、可调节结构、易于修饰和易于再生。这些特性在新型功能性HOF材料的背景下尚未得到充分探索。本研究中应用的简便且廉价的电泳沉积（EPD）方法在室温下仅需2分钟就能制备出透明的HOF薄膜，并且适用于其他HOFs。所得薄膜表现出可逆电致变色特性，具有长循环寿命（>500次循环）的优势。更引人注目的是，这种全有机薄膜可以很容易地再生（通过用N，N-二甲基甲酰胺冲洗和重新沉积），并表现出可调节的电致变色行为（通过低成本的后合成修饰），能够连续发生颜色变化，这是传统电致变色材料难以实现的。制造了一种电致变色器件以进一步证明该薄膜的应用潜力。
