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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Improved synthesis of β-ketoenamine-linked covalent organic frameworks via monomer exchange reactions
Michael C Daugherty,Edon Vitaku,Rebecca L. Li,Austin M. Evans,Anton D. Chavez,Anton D. Chavez,William R. Dichtel +6 more
TL;DR: Several β-ketoenamine-linked COFs are synthesized, including two unreported structures, with unmatched crystallinity and high surface areas by preparing the corresponding imine- linked COF and exchanging its triformylbenzene monomers with triformyphloroglucinol.
Journal ArticleDOI
One-Step Synthesis of Highly Efficient Nanocatalysts on the Supports with Hierarchical Pores Using Porous Ionic Liquid-Water Gel
Xinchen Kang,Jianling Zhang,Wenting Shang,Tianbin Wu,Peng Zhang,Buxing Han,Zhonghua Wu,Guang Mo,Xueqing Xing +8 more
TL;DR: The catalysts were extremely active, selective, and stable for oxidative esterification of benzyl alcohol to methyl benzoate, benzene hydrogenation to cyclohexane, and oxidation of benzinyl alcohol to benzaldehyde because they combined the advantages of the nanocatalysts of small size and hierarchical porosity of the supports.
Journal ArticleDOI
Recent Advances in Covalent Organic Frameworks for Catalysis
Jianguo Liu,Nan Wang,Longlong Ma +2 more
TL;DR: This work focuses on summarizing recent and significant developments in COFs materials, with an emphasis on both the synthetic strategies and targeted functionalization, and the potential catalysis applications of these materials in accordance with the different types of catalytic reactions.
Journal ArticleDOI
Approaches and challenges in the synthesis of three-dimensional covalent-organic frameworks
Xingjian Ma,Timothy F. Scott +1 more
TL;DR: In this article, the authors present an overview of synthetic approaches to yield 3D covalent organic frameworks, identify synthetic obstacles that have hindered progress in the field, and propose alternative techniques to circumvent these synthetic challenges.
Journal ArticleDOI
Substrate-mediated ordering and defect analysis of a surface covalent organic framework
Oualid Ourdjini,Rémy Pawlak,Mathieu Abel,Sylvain Clair,L Chen,N. Bergeon,Michel Sassi,Vincent Oison,Jean-Marc Debierre,Roland Coratger,Louis Porte +10 more
TL;DR: In this paper, the growth of a two-dimensional polymer obtained by dehydration of 1,4-benzenediboronic acid (BDBA) was investigated, and it was shown that a high molecular flux is necessary to initiate BDBA polymerization on all surfaces at room temperature.
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.
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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.