Designed synthesis of 3D covalent organic frameworks
Hani M El-Kaderi1, Joseph R Hunt, José L Mendoza-Cortés
1Center for Reticular Chemistry at California NanoSystems Institute, Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, CA 90095, USA.
Science (New York, N.Y.)
|April 14, 2007
Summary
New three-dimensional covalent organic frameworks (3D COFs) exhibit high thermal stability and surface areas. These advanced materials, synthesized using condensation reactions, offer exceptionally low densities for potential applications.
Area of Science:
- Materials Science
- Chemistry
Background:
- Covalent Organic Frameworks (COFs) are crystalline porous polymers.
- Designing 3D COFs with specific network topologies is an ongoing challenge.
Purpose of the Study:
- To synthesize novel three-dimensional covalent organic frameworks (3D COFs).
- To target specific network topologies (ctn and bor) for tailored material properties.
Main Methods:
- Synthesis of 3D COFs via condensation reactions.
- Utilizing tetrahedral building blocks like tetra(4-dihydroxyborylphenyl)methane or silane.
- Co-condensation with triangular 2,3,6,7,10,11-hexahydroxytriphenylene.
Main Results:
- Successfully synthesized crystalline 3D COFs (COF-102 and COF-103).
- Achieved high thermal stability (400-500 °C) due to strong covalent bonds.
- Obtained high surface areas (3472-4210 m²/g) and extremely low densities (0.17 g/cm³).
Conclusions:
- The targeted synthesis yielded robust 3D COFs with desirable properties.
- These 3D COFs demonstrate potential for applications requiring high surface area and low density.
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