Designed Synthesis of 3D Covalent Organic Frameworks
Hani M. El-Kaderi,1
Joseph R. Hunt,1
José L. Mendoza-Cortés,1
Adrien P. Côté,1
Robert E. Taylor,1
Michael O'Keeffe,2
Omar M. Yaghi1*
Three-dimensional covalent organic frameworks (3D COFs) were
synthesized by targeting two nets based on triangular and tetrahedral
nodes:
ctn and
bor. The respective 3D COFs were synthesized
as crystalline solids by condensation reactions of tetrahedral
tetra(4-dihydroxyborylphenyl) methane or
tetra(4-dihydroxyborylphenyl)silane
and by co-condensation of triangular 2,3,6,7,10,11-hexahydroxytriphenylene.
Because these materials are entirely constructed from strong
covalent bonds (C-C, C-O, C-B, and B-O), they have high thermal
stabilities (400° to 500°C), and they also have high
surface areas (3472 and 4210 square meters per gram for COF-102
and COF-103, respectively) and extremely low densities (0.17
grams per cubic centimeter).
2 Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287, USA.
* To whom correspondence should be addressed. E-mail: yaghi{at}chem.ucla.edu
