Flexible monomer-based covalent organic frameworks: design, structure and functions

Abstract

The design and synthesis of flexible monomer-based covalent organic frameworks (COFs) have been considered a challenge. Herein, we describe the design and synthesis of a new flexible monomer-based COF, termed PPN-30 (PPN meaning porous polymer network), by the use of a flexible alkyl amine, 1,4-cyclohexanediamine, combined with 1,3,5-triformylbenzene. The structure and gas adsorption properties of PPN-30 were carefully investigated.