Triptycene-based Three-Dimensional Covalent Organic Frameworks with stp Topology of Honeycomb Structure

Two three-dimensional covalent organic frameworks (3D COFs) adopting triptycene as core building blocks were synthesized through [6 + 4] imine condensation reactions. The stp topology and the “6 + 4” linking mode were first reported for constructing 3D COFs. A pore size of 4.0 nm was obtained which is the largest record among the reported 3D COFs. The interpenetration occurred by extending the size of the linkage. The rigid 3D COFs exhibit unique honeycomb nanochannels structures with adjustable pore sizes.