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
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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
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Spectrally Switchable Photodetection with Near-Infrared-Absorbing Covalent Organic Frameworks
TL;DR: Applying a thienoisoindigo-COF:fullerene heterojunction as the photoactive component, this work realized the first COF-based UV- to NIR-responsive photodetector and found that the spectral response of the device is reversibly switchable between blue- and red-sensitive, and green- and Nir-responsive.
Journal ArticleDOI
Light-Emitting Covalent Organic Frameworks: Fluorescence Improving via Pinpoint Surgery and Selective Switch-On Sensing of Anions.
Zhongping Li,Ning Huang,Ka Hung Lee,Yu Feng,Shanshan Tao,Qiuhong Jiang,Yuki Nagao,Stephan Irle,Donglin Jiang +8 more
TL;DR: This pinpoint N-H cleavage on the pore walls can be driven only by the fluoride anion while other halogen anions remain inactive, enabling the selective fluorescence switch-on sensing of the fluorideAnion at a ppb level.
Journal ArticleDOI
Immobilization of ionic liquids to covalent organic frameworks for catalyzing the formylation of amines with CO2 and phenylsilane
TL;DR: The ionic [Et4NBr]50%-Py-COF afforded a high CO2 adsorption capacity and was developed as an effective heterogeneous catalyst for the transformation of CO2 into value-added formamides under ambient conditions.
Journal ArticleDOI
Strategic design of triphenylamine- and triphenyltriazine-based two-dimensional covalent organic frameworks for CO2 uptake and energy storage
Ahmed El-Mahdy,Ahmed El-Mahdy,Cheng Han Kuo,Abdulmohsen Ali Alshehri,Christine Young,Yusuke Yamauchi,Yusuke Yamauchi,Jeonghun Kim,Shiao-Wei Kuo +8 more
TL;DR: In this paper, the synthesis of two series of two-dimensional hexagonally ordered covalent organic frameworks (COFs) through one-pot polycondensations of tris(4-aminophenyl)amine (TPA-3NH2) and 2,4,6-tris-4-amphenyl)-triazine (TPT-3 NH2) with triarylaldehydes featuring different degrees of planarity, symmetry, and nitrogen content.
Journal ArticleDOI
Acid Responsive Hydrogen-Bonded Organic Frameworks.
Ichiro Hisaki,Yuto Suzuki,Eduardo Gomez,Qin Ji,Norimitsu Tohnai,Takayoshi Nakamura,Abderrazzak Douhal +6 more
TL;DR: Remarkably, CPHATN-1a, as a result of the protonation of pyradyl nitrogen atoms embedded in its π-conjugated core, shows reversible vapor acid-induced color changes from yellow to reddish-brown, to the best of the authors' knowledge, this is the first HOF that exhibits acid-responsive color changes.
References
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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.
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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.
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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.
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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.