page_title: Covalent organic framework
section_title: Secondary building units
hierarchical_section_title: Covalent organic framework / Structure / Secondary building units
caption_attribution_description: English: reticular
context_page_description: Covalent organic frameworks are two-dimensional and three-dimensional organic solids with extended structures in which building blocks are linked by strong covalent bonds. COFs are porous and crystalline and are made entirely from light elements that are known to form strong covalent bonds in well-established and useful materials such as diamond, graphite, and boron nitride. Preparation of COF materials from molecular building blocks would provide covalent frameworks that could be functionalized into lightweight materials for diverse applications.
context_section_description: The term ‘secondary building unit’ has been used for some time to describe conceptual fragments which can be compared as bricks used to build a house of zeolites; in the context of this page it refers to the geometry of the units defined by the points of extension.
caption: Schematic Figure of Reticular Chemistry.
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