Journal ArticleDOI
Porous, Crystalline, Covalent Organic Frameworks
Adrien P. Côté,Annabelle I. Benin,Nathan W. Ockwig,Michael O'Keeffe,Adam J. Matzger,Omar M. Yaghi +5 more
Reads0
Chats0
TLDR
Covalent organic frameworks (COFs) have been designed and successfully synthesized by condensation reactions of phenyl diboronic acid and hexahydroxytriphenylene to form rigid porous architectures with pore sizes ranging from 7 to 27 angstroms.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).read more
Citations
More filters
Journal ArticleDOI
Acid Exfoliation of Imine‐linked Covalent Organic Frameworks Enables Solution Processing into Crystalline Thin Films
David W. Burke,Chao Sun,Chao Sun,Ioannina Castano,Nathan C. Flanders,Austin M. Evans,Edon Vitaku,David C. McLeod,Robert H. Lambeth,Lin X. Chen,Lin X. Chen,Nathan C. Gianneschi,William R. Dichtel +12 more
TL;DR: This work reports a general, scalable method to exfoliate two-dimensional imine-linked COF powders by temporarily protonating their linkages, and demonstrates that the film fabrication process proceeds through a partial depolymerization/repolymerized mechanism, providing mechanically robust films that can be easily separated from their substrates.
Journal ArticleDOI
Large pore donor–acceptor covalent organic frameworks
Shangbin Jin,Ko Furukawa,Matthew Addicoat,Long Chen,Long Chen,Seiya Takahashi,Stephan Irle,Toshikazu Nakamura,Donglin Jiang +8 more
TL;DR: In this paper, the synthesis and structural characterization of large pore covalent organic frameworks (COFs) integrated with donor and acceptor building blocks are reported, which show high crystallinity and large surface area.
Journal ArticleDOI
Sub-stoichiometric 2D covalent organic frameworks from tri- and tetratopic linkers
Tanmay Banerjee,Frederik Haase,Frederik Haase,Frederik Haase,Stefan Trenker,Bishnu P. Biswal,Goekcen Savasci,Goekcen Savasci,Viola Duppel,Igor L. Moudrakovski,Christian Ochsenfeld,Christian Ochsenfeld,Bettina V. Lotsch +12 more
TL;DR: It is shown that tri- and tetratopic linkers can be combined to form imine-linked [4 + 3] sub-stoichiometric 2D COFs featuring an unexpected bex net topology, and with periodic uncondensed amine functionalities which enhance CO2 adsorption, can be derivatized in a subsequent reaction, and can also act as organocatalysts.
Journal ArticleDOI
Hot π‐electron Tunneling of Metal‐Insulator‐COF Nanostructures for Efficient Hydrogen Production
Jintao Ming,Ai Liu,Jiwu Zhao,Pu Zhang,Haowei Huang,Huan Lin,Ziting Xu,Xuming Zhang,Xuxu Wang,Johan Hofkens,Maarten B. J. Roeffaers,Jinlin Long +11 more
TL;DR: Compared to the Schottky-type counterparts, the COF-based MIS photosystems give a 32-fold-enhanced carrier efficiency, attributed to the combined enhancement of photoexcitation rate, charge separation and oxidation rate of holes accumulated in valence band of the TP-COF semiconductors.
Journal ArticleDOI
Lanthanide(III)-cobalt(II) heterometallic coordination polymers with radical adsorption properties.
Xiao-Qing Zhao,Bin Zhao,Yue Ma,Wei Shi,Peng Cheng,Zong-Hui Jiang,Dai-Zheng Liao,Shi-Ping Yan +7 more
TL;DR: The adsorption experiment shows that 1 and 2 can adsorb radicals, which is proven by electron paramagnetic resonance spectra with the characteristic bands of the radicals at g = 2.006 and 2.005, respectively.
References
More filters
Book
Adsorption by Powders and Porous Solids: Principles, Methodology and Applications
TL;DR: In this paper, the authors provide an introductory review of the various theoretical and practical aspects of adsorption by powders and porous solids with particular reference to materials of technological importance.
Journal ArticleDOI
An ordered mesoporous organosilica hybrid material with a crystal-like wall structure.
TL;DR: The surfactant-mediated synthesis of an ordered benzene–silica hybrid material has an hexagonal array of mesopores and crystal-like pore walls that exhibit structural periodicity, and it is expected that other organosilicas and organo-metal oxides can be produced in a similar fashion, to yield a range of hierarchically ordered mesoporous solids with molecular-scale pore surface periodicity.
Journal ArticleDOI
Unified Approach to Pore Size Characterization of Microporous Carbonaceous Materials from N2, Ar, and CO2 Adsorption Isotherms†
TL;DR: In this paper, a unified approach to pore size characterization of microporous carbonaceous materials such as activated carbon and carbon fibers by nitrogen, argon, and carbon dioxide adsorption at standard temperatures, 77 K for N2 and Ar and 273 K for CO2, was presented.
Journal ArticleDOI
Adsorption Study of Surface and Structural Properties of MCM-41 Materials of Different Pore Sizes
TL;DR: In this paper, the pore size of MCM-41 materials was estimated based on geometrical considerations of the ratio of pore volume to pore wall volume for an infinite hexagonal array of cylindrical pores.