Three-Dimensional Triptycene-Functionalized Covalent Organic Frameworks with hea Net for Hydrogen Adsorption

Owing to the finite building blocks and difficulty in structural identification, it remains a tremendous challenge to elaborately design and synthesize three-dimensional covalent organic frameworks (3D COFs) with predetermined topologies. Herein, we report the first two cases of 3D COFs with the non-interpenetrated hea net, termed JUC-596 and JUC-597, by using the combination of tetrahedral and triangular prism building units. Due to the presence of triptycene functional groups and fluorine atoms, JUC-596 exhibits an exceptional performance in the H-2 adsorption up to 305 cm(3) g(-1) (or 2.72 wt%) at 77 K and 1 bar, which is higher than previous benchmarks from porous organic materials reported so far. Furthermore, the strong interaction between H-2 and COF materials is verified through the DFT theoretical calculations. This work represents a captivating example of rational design of functional COFs based on a reticular chemistry guide and demonstrates its promising application in clean energy storage.

Automated summary

In this study, two non-interpenetrated three-dimensional COFs, named JUC-596 and JUC-597, were successfully reported by using the combination of tetrahedral and triangular prism building units. JUC-596 exhibited exceptional performance in H-2 adsorption, surpassing previous benchmarks from porous organic materials. The strong interaction between H-2 and COF materials was verified through theoretical calculations.