Ma Yunchao, Wang Yujie, Li Hui, Guan Xinyu, Li Baoju, Xue Ming, Yan Yushan, Valtchev Valentin, Qiu Shilun, Fang Qianrong
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun, 130012, China.
Department of Chemical and Biomolecular Engineering, Center for Catalytic Science and Technology, University of Delaware, Newark, DE, 19716, USA.
Angew Chem Int Ed Engl. 2020 Oct 26;59(44):19633-19638. doi: 10.1002/anie.202005277. Epub 2020 Jun 22.
The development of three-dimensional (3D) covalent organic frameworks (COFs) with high chemical stability is of critical importance for their practical use. In this work, it is demonstrated that the stability of 3D COFs can be improved by periodic decoration of isopropyl groups on their backbones. Owing to the strong hydrophobicity of the alkyl groups, the resultant COFs show high crystallinity, permanent pores, and exceptional stability in harsh environments, such as strong acids (3 m HCl or 3 m H SO for one week), a strong base (20 m NaOH for one week), and boiling water (100 °C for one month). Furthermore, these highly stable and hydrophobic COFs display excellent oil/water separation performance with >99 % separation efficiency over a wide pH range. This work demonstrates the use of alkyl decoration in 3D COFs to tune their chemical stability and expand their potential applications.
开发具有高化学稳定性的三维（3D）共价有机框架（COF）对于其实际应用至关重要。在这项工作中，证明了通过在3D COF的骨架上周期性地修饰异丙基可以提高其稳定性。由于烷基具有很强的疏水性，所得的COF在恶劣环境中表现出高结晶度、永久性孔隙和出色的稳定性，如在强酸（3 m HCl或3 m H₂SO₄中放置一周）、强碱（20 m NaOH中放置一周）和沸水中（100°C下放置一个月）。此外，这些高度稳定且疏水的COF在很宽的pH范围内展现出优异的油/水分离性能，分离效率>99%。这项工作展示了在3D COF中使用烷基修饰来调节其化学稳定性并拓展其潜在应用。
