Figure 1
From: Designed synthesis of double-stage two-dimensional covalent organic frameworks
Chemical approach to COFs.
(a) Schematic representation of the approaches to the conventional hexagonal and tetragonal COFs with monofucntional linkers made of two kinds of monomers. (b) Schematic representation of the double-stage approach to COFs with bifucntional linkers made of three different building blocks. (c) Typical linkage structures of boronate, boroxine and imine COFs and linkage structure of the double-stage COF along with the structure of the bifunctional linker 4-formylphenylboronic acid (FPBA).
