89641-21-4Relevant articles and documents
A permanent mesoporous organic cage with an exceptionally high surface area
Zhang, Gang,Presly, Oliver,White, Fraser,Oppel, Iris M.,Mastalerz, Michael
, p. 1516 - 1520 (2014)
Recently, porous organic cage crystals have become a real alternative to extended framework materials with high specific surface areas in the desolvated state. Although major progress in this area has been made, the resulting porous compounds are restricted to the microporous regime, owing to the relatively small molecular sizes of the cages, or the collapse of larger structures upon desolvation. Herein, we present the synthesis of a shape-persistent cage compound by the reversible formation of 24 boronic ester units of 12 triptycene tetraol molecules and 8 triboronic acid molecules. The cage compound bears a cavity of a minimum inner diameter of 2.6 nm and a maximum inner diameter of 3.1 nm, as determined by single-crystal X-ray analysis. The porous molecular crystals could be activated for gas sorption by removing enclathrated solvent molecules, resulting in a mesoporous material with a very high specific surface area of 3758 m2 g-1 and a pore diameter of 2.3 nm, as measured by nitrogen gas sorption. Big boronic ester cages: A shape-persistent cuboctahedron can be almost quantitatively formed by a 48-fold one-pot condensation of 12 molecules of a triptycene tetrol with 8 molecules of triboronic acid. The desolvated crystalline material of this cage has a specific surface area of 3758 m2 g-1 and a maximum pore size of 2.3 nm, thus making it mesoporous by the IUPAC definition. Copyright
Synthesis of a highly crystalline, covalently linked porous network
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, (2019/05/15)
Porous networks are described linked by boronates. Also described are processes for producing the porous networks. The porous networks are formed by reacting a polyboronic acid with itself or with a polydiol, a polydiamine, or a polyamino alcohol. The res
A Photoresponsive Smart Covalent Organic Framework
Huang, Ning,Ding, Xuesong,Kim, Jangbae,Ihee, Hyotcherl,Jiang, Donglin
, p. 8704 - 8707 (2015/11/27)
Ordered π-columnar structures found in covalent organic frameworks (COFs) render them attractive as smart materials. However, external-stimuli-responsive COFs have not been explored. Here we report the design and synthesis of a photoresponsive COF with anthracene units as the photoresponsive π-building blocks. The COF is switchable upon photoirradiation to yield a concavo-convex polygon skeleton through the interlayer [4π+4π] cycloaddition of anthracene units stacked in the π-columns. This cycloaddition reaction is thermally reversible; heating resets the anthracene layers and regenerates the COF. These external-stimuli-induced structural transformations are accompanied by profound changes in properties, including gas adsorption, π-electronic function, and luminescence. The results suggest that COFs are useful for designing smart porous materials with properties that are controllable by external stimuli.
