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Hydrogen-bonded Organic Framework
Hydrogen-bonded organic frameworks (HOFs) are a class of porous polymers formed by hydrogen bonds among molecular monomer units to afford porosity and structural flexibility. There are diverse hydrogen bonding pair choices that could be used in HOFs construction, including identical or nonidentical hydrogen bonding donors and acceptors. For organic groups acting as hydrogen bonding units, species like carboxylic acid, amide, 2,4-diaminotriazine, and imidazole, etc., are commonly used for the formation of hydrogen bonding interaction. Compared with other organic frameworks, like Covalent organic framework, COF and Metal–organic framework, MOF, the binding force of HOFs is relatively weaker, and the activation of HOFs is more difficult than other frameworks, while the reversibility of hydrogen bonds guarantees a high crystallinity of the materials. Though the stability and pore size expansion of HOFs has potential problems, HOFs still show strong potential for applications in differen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porous Polymer
Porous polymers are a class of porous media materials in which monomers form 2D polymer, 2D and 3D polymers containing angstrom- to nanometer-scale pores formed by the arrangement of the monomers. They may be either crystalline or amorphous. Subclasses include covalent organic frameworks (COFs), hydrogen-bonded organic frameworks (HOFs), metal-organic frameworks (MOFs), and porous organic polymers (POPs). The subfield of chemistry specializing in porous polymers is called reticular chemistry. Covalent organic frameworks Covalent organic frameworks are crystalline porous polymers assembled from organic monomers linked through covalent bonds. Hydrogen-bonded organic frameworks Hydrogen-bonded organic frameworks are crystalline porous polymers assembled from organic monomers linked through hydrogen bonds. Metal-organic frameworks Metal-organic frameworks are crystalline porous polymers assembled from organic monomers connected by Coordination chemistry, coordination to metal atom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
