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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Mechanical and optical properties of ultralarge flakes of a metal-organic framework with molecular thickness.
Cristina Hermosa,Benjamin R. Horrocks,José I. Martínez,Fabiola Liscio,Julio Gómez-Herrero,Félix Zamora +5 more
TL;DR: The red emission on isolated 2d-mof flakes with areas of square microns and molecular thicknesses has been characterized and free-standing flakes have been produced and their mechanical and optical properties studied.
Journal ArticleDOI
Mechanosynthesis of imine, β-ketoenamine, and hydrogen-bonded imine-linked covalent organic frameworks using liquid-assisted grinding.
TL;DR: A variety of aromatic amines/hydrazides and aldehydes have been utilized for the construction of crystalline COFs at a faster rate and in high yield, irrespective of their reactivity and solubility using the Liquid-Assisted Grinding (LAG) method.
Journal ArticleDOI
Irreversible Amide-Linked Covalent Organic Framework for Selective and Ultrafast Gold Recovery.
TL;DR: The rational design of irreversible bonds as both inherent linkage and functional groups in COFs is a promising way to prepare stable COFs for diverse applications.
Journal ArticleDOI
Room temperature synthesis of heptazine-based microporous polymer networks as photocatalysts for hydrogen evolution.
Kamalakannan Kailasam,Johannes Schmidt,Hakan Bildirir,Guigang Zhang,Siegfried Blechert,Xinchen Wang,Arne Thomas +6 more
TL;DR: Two emerging material classes are combined in this work, namely polymeric carbon nitrides and microporous polymer networks, which are composed of amine-bridged heptazine moieties and showed interesting performance as a metal-free photocatalyst.
Journal ArticleDOI
Covalent Self-Assembly in Two Dimensions: Connecting Covalent Organic Framework Nanospheres into Crystalline and Porous Thin Films
Himadri Sekhar Sasmal,Arjun Halder,Shebeeb Kunjattu H,Kaushik Dey,Athulya Nadol,Thalasseril G. Ajithkumar,Prachiti R. Bedadur,Rahul Banerjee +7 more
TL;DR: This work proposes a unique way to make uniform, solution-processable crystalline, and porous COF nanospheres directly from the homogeneous solution of amine and aldehyde via spatial and temporal control of the nu-cleation and growth.
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.
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.
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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.
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.