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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Journal ArticleDOI
Benzoxazole-Linked Ultrastable Covalent Organic Frameworks for Photocatalysis.
Pi-Feng Wei,Ming-Zhu Qi,Zhi-Peng Wang,San-Yuan Ding,Wei Yu,Qiang Liu,Li-Ke Wang,Huai-Zhen Wang,Wan-Kai An,Wei Wang +9 more
TL;DR: This contribution represents the first report on the photocatalytic application of benzoxazole-based structures and sheds new light on the exploration of robust organophotocatalysts from small molecules to extended frameworks but also offers in-depth understanding of the structure-activity relationship toward practical applications of COF materials.
Journal ArticleDOI
Highly Emissive Covalent Organic Frameworks
TL;DR: A general strategy to design highly emissive COFs by introducing an aggregation-induced emission (AIE) mechanism and achieving exceptional quantum yield via a synergistic structural locking effect of intralayer covalent bonding and interlayer noncovalent π-π interactions.
Journal ArticleDOI
High-Flux Membranes Based on the Covalent Organic Framework COF-LZU1 for Selective Dye Separation by Nanofiltration.
TL;DR: The continuous two-dimensional imine-linked COF-LZU1 membrane with a thickness of only 400 nm was prepared on alumina tubes by in-situ solvothermal synthesis and shows excellent water permeance and outstanding water stability, rendering it an interesting system for water purification.
Journal ArticleDOI
Chemical sensing in two dimensional porous covalent organic nanosheets.
Gobinda Das,Bishnu P. Biswal,Bishnu P. Biswal,Sharath Kandambeth,Sharath Kandambeth,V. Venkatesh,Gagandeep Kaur,Matthew Addicoat,Thomas Heine,Sandeep Verma,Rahul Banerjee,Rahul Banerjee +11 more
TL;DR: Covalent organic nanosheets (CONs) were synthesised from imide functionalised COFs and exhibit a "turn-on" detection capability for 2,4,6-trinitrophenol in the solid state, but show a " turn-off" detection in the dispersion state.
Journal ArticleDOI
Unprecedented high-temperature CO 2 selectivity in N 2 -phobic nanoporous covalent organic polymers
Hasmukh A. Patel,Sang Hyun Je,Joonho Park,Dennis P. Chen,Yousung Jung,Cafer T. Yavuz,Ali Coskun +6 more
TL;DR: Azo-bridged, nitrogen-rich, aromatic, water stable, nanoporous covalent organic polymers, which can be synthesized by catalyst-free direct coupling of aromatic nitro and amine moieties under basic conditions are reported, displaying an unprecedented increase in CO(2)/N(2) selectivity with increasing 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.
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.