Chemical Research in Chinese Universities ›› 2022, Vol. 38 ›› Issue (2): 428-432.doi: 10.1007/s40242-022-1454-x

• Articles • Previous Articles     Next Articles

Dimeric Calix[4]resorcinarene-based Porous Organic Cages for CO2/CH4 Separation

YANG Miao1,2, WANG Wenjing2,3, SU Kongzhao2,3, YUAN Daqiang2,3   

  1. 1. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, P. R. China;
    2. State Key Lab of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China;
    3. University of the Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2021-11-10 Revised:2021-12-10 Online:2022-04-01 Published:2021-12-14
  • Contact: SU Kongzhao, YUAN Daqiang E-mail:skz@fjirsm.ac.cn;ydq@fjirsm.ac.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No.22071244) and the Natural Science Foundation of Fujian Province, China (Nos.2019I0028, 2020J05087).

Abstract: Investigating gas separation by emerging porous organic cage(POC) solids is still on its initial stage. In this work, two novel [2+4] organic cages with distinguished structures have been prepared based on the Schiff-based condensation reaction between tetraformyl-functionalized calix[4]resorcinarene building blocks and xylylenediamine(XDA) isomers. Specifically, the use of para-position XDA affords lantern-shaped cage(CPOC-105) with a medium cavity of ca. 0.526 nm3, while the meta-position produces peanut-shaped structure(CPOC-106) with two small cavities of ca. 0.181 nm3. Both CPOC-105 and CPOC-106 exhibit high selectivity capture of CO2 over CH4 with calculated selectivity coefficients of 4.5 and 3.1, respectively, under ambient conditions, and are capable of separating CO2/CH4 mixtures by fixed-bed column breakthrough experiments.

Key words: Porous organic cage, Calix[4]resorcinarene, Self-assembly, Gas separation, Host-guest interaction