Covalent bond

Hydrogen bond

Non-covalent interactions

Molecule

Supramolecular chemistry

Catalysis

Imine

Polymer

Covalent organic framework

Organic chemistry

Chemistry

Materials science

Dynamic covalent chemistry

Nature Reviews Chemistry

Covalent organic frameworks (COFs) are porous crystalline polymers that result from the formation of covalent bonds between precisely assembled organic units. Linkage chemistry is a crucial factor in the controllable synthesis and resulting physicochemical properties of COFs. Imine linkages are popular in the formation of polyfunctional two-dimensional (2D) COFs because they are formed easily with structural and functional diversity. There has been much recent interest in expanding beyond this to COFs with imine-derived linkages. This review highlights the development of chemistry to modify and prepare derivatives of imines within 2D COFs. We discuss the derivation of imine bonds via covalent and noncovalent bonding and the properties and potential applications of the resulting materials in order to provide a better understanding of the relationship between covalent linkages and overall performance for 2D COF materials.                                                                  Linkage chemistry is cruc...

Imine and imine-derived linkages in two-dimensional covalent organic frameworks