4253-11-6Relevant academic research and scientific papers
Accurate tuning of rare earth metal-organic frameworks with unprecedented topology for white-light emission
Wang, Yutong,Zhang, Kai,Wang, Xiaokang,Xin, Xuelian,Zhang, Xiurong,Fan, Weidong,Xu, Ben,Dai, Fangna,Sun, Daofeng
supporting information, p. 1374 - 1379 (2020/02/11)
A series of isostructural rare-earth metal-organic frameworks (RE-MOFs), namely {[RE(L-X)(H2O)]·2DMF}n (UPC-38, RE = Eu, Tb, X = H, F, Cl, NH2, CH3, OCH3; L = [1,1′:3′,1′′-terphenyl]-4,4′′,5′-tricarbo
Optimizing Multivariate Metal-Organic Frameworks for Efficient C2H2/CO2Separation
Fan, Weidong,Yuan, Shuai,Wang, Wenjing,Feng, Liang,Liu, Xiuping,Zhang, Xiurong,Wang, Xia,Kang, Zixi,Dai, Fangna,Yuan, Daqiang,Sun, Daofeng,Zhou, Hong-Cai
supporting information, p. 8728 - 8737 (2020/12/25)
Adsorptive separation of acetylene (C2H2) from carbon dioxide (CO2) promises a practical way to produce high-purity C2H2 required for industrial applications. However, challenges exist in the pore environment engineering of porous materials to recognize two molecules due to their similar molecular sizes and physical properties. Herein, we report a strategy to optimize pore environments of multivariate metal-organic frameworks (MOFs) for efficient C2H2/CO2 separation by tuning metal components, functionalized linkers, and terminal ligands. The optimized material UPC-200(Al)-F-BIM, constructed from Al3+ clusters, fluorine-functionalized organic linkers, and benzimidazole terminal ligands, demonstrated the highest separation efficiency (C2H2/CO2 uptake ratio of 2.6) and highest C2H2 productivity among UPC-200 systems. Experimental and computational studies revealed the contribution of small pore size and polar functional groups on the C2H2/CO2 selectivity and indicated the practical C2H2/CO2 separation of UPC-200(Al)-F-BIM.
Topology Exploration in Highly Connected Rare-Earth Metal-Organic Frameworks via Continuous Hindrance Control
Wang, Yutong,Feng, Liang,Fan, Weidong,Wang, Kun-Yu,Wang, Xia,Wang, Xiaokang,Zhang, Kai,Zhang, Xiurong,Dai, Fangna,Sun, Daofeng,Zhou, Hong-Cai
supporting information, p. 6967 - 6975 (2019/05/10)
The structural diversity of highly connected metal-organic frameworks (MOFs) has long been limited due to the scarcity of highly connected metal clusters and the corresponding available topology. Herein, we deliberately chose a series of tritopic linkers
Topology Exploration in Highly Connected Rare-Earth Metal-Organic Frameworks via Continuous Hindrance Control
Wang, Yutong,Feng, Liang,Fan, Weidong,Wang, Kun-Yu,Wang, Xia,Wang, Xiaokang,Zhang, Kai,Zhang, Xiurong,Dai, Fangna,Sun, Daofeng,Zhou, Hong-Cai
supporting information, (2019/05/06)
The structural diversity of highly connected metal-organic frameworks (MOFs) has long been limited due to the scarcity of highly connected metal clusters and the corresponding available topology. Herein, we deliberately chose a series of tritopic linkers
Oxidative iodination of deactivated arenes in concentrated sulfuric acid with I2/NaIO4 and KI/NaIO4 iodinating systems
Kraszkiewicz, Lukasz,Sosnowski, Maciej,Skulski, Lech
, p. 1195 - 1199 (2007/10/03)
Deactivated arenes were mono- or diiodinated with strong electrophilic I+ reagents, which were prepared from NaIO4 and either I2 or KI in concentrated H2SO4 (minimum 95% by weight). In general a small excess of the dark brown iodinating solution was used (1.1/1.5 equivalents, for nitrobenzene two equivalents was required). The iodinations were conducted at 25-30 °C with a reaction time of 1-2 hours using either a 'direct' or an 'inverse' method of aromatic iodination to give mono- or diiodinated pure products in 31-91% optimized yields. Georg Thieme Verlag Stuttgart.
Easy, inexpensive and effective oxidative iodination of deactivated arenes in sulfuric acid
Kraszkiewicz, Lukasz,Sosnowski, MacIej,Skulski, Lech
, p. 9113 - 9119 (2007/10/03)
Two 'model' deactivated arenes, benzoic acid and nitrobenzene, were effectively monoiodinated within 1 h at 25-30 °C, with strongly electrophilic I+ reagents, prior prepared from diiodine and various oxidants (CrO3, KMnO4, active MnO2, HIO 3, NaIO3, or NaIO4) in 90% (v/v) concd sulfuric acid (ca. 75 mol% H2SO4). Next, an I2/ NaIO3/90% (v/v) concd H2SO4 exemplary system was used to effectively mono- or diiodinate a number of deactivated arenes. All former papers dealing with the direct iodination of deactivated arenes are briefly reviewed.
Steric Enhancement of Resonance-Evidence from Kinetic Study on some Acetophenones
Pillay, M. Krishna,Palanivelu, S.
, p. 1055 - 1059 (2007/10/02)
The kinetics of oxidation of some mono-, di- and tri-substituted acetophenones by alkaline hexacyanoferrate(III) in 50percent (v/v) methanol-water mixture at constant ionic strength and at 20, 30 and 40 deg have been studied spectrophotometrically and the rate constants determined by least-squares analysis.Electron-withdrawing groups in the ring facilitate the oxidation of the acetyl function while electron-releasing groups retard the rate.The rate constant values for the oxidation of 3-substituted-4-alkoxy-acetophenones are computed based on the principle of additivity of group effects.The observed rate constants are significantly lower than the calculated values.This is attributed to the phenomenon of steric enhancement of resonance (SER). 3,5-Disubstituted-4-methoxyacetophenones have higher observed rate constant values than the calculated ones.The steric inhibition of resonance (SIR) operates in these systems.In the case of 3-halogeno-4-methoxyacetophenones, the importance of SER increases with increase in the bulkiness of the 3-substituents.The difference between the calculated and observed multiple substituent constants of 3-substituted-4-methoxyacetophenones also lends support for SER.
