Linkers in covalent organic frameworks (COFs) can include a variety of functional groups and molecules beyond those mentioned above, such as esters, ethers, ketones, and more. These linkers play a crucial role in determining the structure, properties, and performance of COFs, as they affect factors such as porosity, surface area, and chemical stability. Depending on the specific linkers used, COFs can be tailored for a variety of applications, including catalysis, adsorption, separation, and energy storage. Researchers are constantly exploring new linker chemistries to expand the range of properties and functionalities available in COFs. The wide variety of linker options provides a broad arena for the development of COFs with unique architectures and properties tailored for specific applications.