title: Porous, crystalline, covalent organic frameworks.
abstract: Covalent organic frameworks (COFs) have been designed and successfully synthesized by condensation reactions of phenyl diboronic acid {C6H4[B(OH)2]2} and hexahydroxytriphenylene [C18H6(OH)6]. Powder x-ray diffraction studies of the highly crystalline products (C3H2BO)6.(C9H12)1 (COF-1) and C9H4BO2 (COF-5) revealed expanded porous graphitic layers that are either staggered (COF-1, P6(3)/mmc) or eclipsed (COF-5, P6/mmm). Their crystal structures are entirely held by strong bonds between B, C, and O atoms to form rigid porous architectures with pore sizes ranging from 7 to 27 angstroms. COF-1 and COF-5 exhibit high thermal stability (to temperatures up to 500 degrees to 600 degrees C), permanent porosity, and high surface areas (711 and 1590 square meters per gram, respectively).
authors.affiliation: Materials Design and Discovery Group, Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, MI 48109-1055, USA.
authors.forename: Adrien P
authors.initials: AP
authors.lastname: Côté
authors.forename: Annabelle I
authors.initials: AI
authors.lastname: Benin
authors.forename: Nathan W
authors.initials: NW
authors.lastname: Ockwig
authors.forename: Michael
authors.initials: M
authors.lastname: O'Keeffe
authors.forename: Adam J
authors.initials: AJ
authors.lastname: Matzger
authors.forename: Omar M
authors.initials: OM
authors.lastname: Yaghi