Three-Dimensional Triptycene-Based Covalent Organic Frameworks with ceq or acs Topology

The growth of three-dimensional covalent organic frameworks (3D COFs) with new topologies is still considered as a great challenge due to limited availability of high-connectivity building units. Here we report the design and synthesis of 3D triptycene-based COFs, termed JUC-568 and JUC-569, following the deliberate symmetry-guided design principle. By combining a triangular prism (6-connected) node with a planar triangle (3-connected) or another triangular prism node, the targeted COFs adopt non-interpenetrated ceq or acs topology, respectively. Both materials show permanent porosity and impressive performance in the adsorption of CO2 (similar to 98 cm(3)/g at 273 K and 1 bar), CH4 (similar to 48 cm(3)/g at 273 K and 1 bar), and especially H-2 (up to 274 cm(3)/g or 2.45 wt % at 77 K and 1 bar), which is highest among porous organic materials reported to date. This research thus provides a promising strategy for diversifying 3D COFs based on complex building blocks and promotes their potential applications in energy storage and environment-related fields.

Automated summary

This study presents the design and synthesis of 3D triptycene-based COFs with specific topologies, which exhibit excellent gas adsorption performance. The materials show potential for diversifying 3D COFs based on complex building blocks and hold promise for applications in energy storage and environmental fields.