Three-dimensional Covalent Organic Frameworks Synthesized by Room Temperature Ionic Liquid Method†

doi:10.7503/cjcu20190086

Abstract

Abstract:

We report a new kind of three-dimensional(3D) covalent organic frameworks(COFs) synthesized by room temperature ionic liquid method, denoted as JUC-515, with a 5-fold interpenetrated diamond topological network. The main method to synthesize COFs is solvothermal method, which needs not only high temperature and high pressure but also long reaction time, making it hard to synthesize COFs, especially 3D COFs. Room temperature ionic liquid method, which uses room temperature and ordinary pressure as well as shorter reaction time, is easy to be carried out and can be regarded as a green chemistry method. JUC-515 has high crystallinity, large porosity and favorable carbon dioxide selectivity.

Key words: Covalent organic frameworks(COFs), Porous material, Ionic liquid, Selective absorption

CLC Number:

O611

TrendMD:

LIU Xiaozhou, GUAN Xinyu, FANG Qianrong, JIN Yongri. Three-dimensional Covalent Organic Frameworks Synthesized by Room Temperature Ionic Liquid Method^†[J]. Chem. J. Chinese Universities, 2019, 40(7): 1341.

Figures/Tables 5

Scheme 1 Synthetic procedure of JUC-515

Fig.1 PXRD patterns(A) and structural representation(B) of JUC-515 (B) C: grey; H: white; N: blue; F: cyan.

Fig.2 IR spectra of JUC-515(a), TAPM(b), TFPDA(c) and [BMIm]NTf2(d) (A), SEM image(B) and TG-DTA curves of JUC-515(C)

Fig.3 N2 adsorption-desorption isotherms of JUC-515 at 77 K(A) and pore size distribution calculated by fitting on the NLDFT model(B)

Fig.4 CO2 and N2 adsorption isotherms of JUC-515 at 273 K (A) and linear fitting of the low-pressure Henry region of gas adsorption isotherms on JUC-515 measured at 273 K(B)

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