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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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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Single-Step Solution-Phase Synthesis of Free-Standing Two-Dimensional Polymers and Their Evolution into Hollow Spheres
TL;DR: In this paper, the triptycene scaffold is used as one monomeric unit to suppress the interlayer interaction between the as-formed polymeric 2D monolayers.
Journal ArticleDOI
New materials in sample preparation: Recent advances and future trends
Edvaldo Vasconcelos Soares Maciel,Ana Lúcia de Toffoli,Eduardo Sobieski Neto,Carlos Eduardo Domingues Nazario,Fernando Mauro Lanças +4 more
TL;DR: In this paper, a review summarizes the recent advances and the prospects for new materials to be utilized in sample preparation techniques, emphasizing microextraction techniques based upon a sorption process in line with the concept of green analytical chemistry.
Journal ArticleDOI
Triazatruxene based covalent organic framework and its quick-response fluorescence-on nature towards electron rich arenes
TL;DR: In this article, two 2D covalent organic frameworks (COFs) with a regular honeycomb lattice, TAT-COF-1 and TAT COF-2, were synthesized based on triazatruxene derivatives, which have a large surface area, good crystallinity, moderate to good hydrogen and carbon dioxide adsorption abilities and also possess good CO2/N-2 selectivity.
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A π-electronic covalent organic framework catalyst: π-walls as catalytic beds for Diels–Alder reactions under ambient conditions
TL;DR: A strategy for developing π-electronic covalent organic frameworks as heterogeneous catalysts that enable the use of columnar ρ-walls as catalytic beds to facilitate organic transformations in their one-dimensional open channels is reported.
Journal ArticleDOI
Covalent organic frameworks: Design principles, synthetic strategies, and diverse applications
TL;DR: Covalent organic frameworks (COFs) as discussed by the authors are the emerging type of organic crystalline porous materials, prepared through reticular chemistry with building blocks featuring light elements (such as C, H, O, N or B atoms), and connected through the covalent bond and extended into two or three dimensions.
References
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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.
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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.