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

Abstract

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 <b>ceq</b> or <b>acs</b> topology, respectively. Both materials show permanent porosity and impressive performance in the adsorption of CO₂ (∼98 cm³/g at 273 K and 1 bar), CH₄ (∼48 cm³/g at 273 K and 1 bar), and especially H₂ (up to 274 cm³/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.