89641-21-4Relevant academic research and scientific papers
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
Self-exfoliation of 2D covalent organic frameworks: Morphology transformation induced by solvent polarity
Zhang, Na,Wang, Taisheng,Wu, Xing,Jiang, Chen,Chen, Fang,Bai, Wei,Bai, Ruke
, p. 3803 - 3808 (2018)
Recently, covalent organic nanosheets (CONs) have emerged as functional two-dimensional (2D) materials for versatile applications. Strong interaction among layers and the instability of borate ester in moisture are the major hurdles to obtain few layered boron-containing CONs by exfoliation of their bulk counterparts. In this paper, we report a facile approach for preparation of few layered borate ester-containing CONs based on electrostatic repulsion of ions. We incorporated organic ionic groups into porous covalent organic frameworks (COFs) and it has been proved that the COFs with quaternary ammonium group could self-exfoliate into few layered ionic covalent organic nanosheets (iCONs) in polar organic solvents. Interestingly, the morphology of the iCOFs-A could be changed from a multilayered aggregation to nanocapsules, or 2D sheets when solvents with different polarity were used. In contrast, non-ionic covalent organic frameworks COFs-B could not self-exfoliate in various solvents. In addition, the self-exfoliated nanosheets could be used to fabricate uniform thin films on SiO2 wafer and the film exhibited explicit optical and electrical properties.
Synthesis of a highly crystalline, covalently linked porous network
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Page/Page column 3; 13, (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
Inflating face-capped Pd6L8 coordination cages
Jansze, Suzanne M.,Ortiz, Daniel,Fadaei Tirani, Farzaneh,Scopelliti, Rosario,Menin, Laure,Severin, Kay
supporting information, p. 9529 - 9532 (2018/08/28)
Tritopic metalloligands were used to form two Pd6L8-type coordination cages. With molecular weights of more than 15 kDa and Pd?Pd distances of up to 4.2 nm, these complexes are among the largest palladium cages described to date.
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.
