A comparative study of C<sub>2</sub>H<sub>2</sub> adsorption properties in five isomeric copper-based MOFs based on naphthalene-derived diisophthalates
作者:Fengli Chen、Dongjie Bai、Donghao Jiang、Yao Wang、Yabing He
DOI:10.1039/c7dt02290e
日期:——
H4L5, respectively. Furthermore, their C2H2 adsorption properties were systematically investigated, revealing that their different C2H2 uptake capacities can be mainly related to their different pore sizes since they possess the same chemical compositions and gravimetric densities of open metal sites. In particular, of these five MOF compounds investigated, ZJNU-71 exhibits the highest gravimetric C2H2
A NbO type microporous metal–organic framework constructed from a naphthalene derived ligand for CH<sub>4</sub>and C<sub>2</sub>H<sub>2</sub>storage at room temperature
A novel NbO type microporous metalâorganic framework [Cu2(C26H12O8)(H2O)2]·(DMF)2·(MeCN)3·(H2O)4, (ZJU-7, ZJU = Zhejiang University; H4L = 5,5â²-(naphthalene-1,4-diyl)diisophthalic acid; DMF = N,N-dimethylformamide; MeCN = acetonitrile) has been synthesized and structurally characterized. With open metal sites, suitable pore spaces and moderately high permanent porosity, the activated ZJU-7a exhibits moderately high CH4 storage of 160 cm3(STP) per cm3 at 35 bar and 298 K. Meanwhile, ZJU-7a also displays moderate C2H2 gravimetric storage of 180 cm3 gâ1 at 1 atm and 298 K.
新型氧化铌微孔金属有机框架[Cu2(C26H12O8)(H2O)2]Â-(DMF)2Â-(MeCN)3Â-(H2O)4,(ZJU-7,ZJU = 浙江大学;H4L=5,5â²-(萘-1,4-二基)二间苯二甲酸;DMF=N,N-二甲基甲酰胺;MeCN=乙腈)的合成和结构表征。活化的 ZJU-7a 具有开放的金属位点、合适的孔隙空间和中等程度的永久孔隙率,在 35 巴和 298 K 条件下具有中等程度的高 CH4 储量(160 cm3(STP) per cm3)。
Encapsulating Rhodamine B in the NbO-type metal-organic framework to construct dual-emitting ratiometric thermometer
composite RhB@MOF formed by ion-exchange was further explored the temperaturesensing behavior in the physiologicaltemperature range. RhB@MOF exhibits an excellent linear relationship between the luminescent intensity ratio of the organic linker and the dye RhB and temperature in the range of 30–90 °C, with the maximum relative temperature sensitivity (Sr) of 0.42%·oC−1 at 30 °C. These results validate
基于多孔金属有机框架 (MOF) 和荧光染料的组合制造主客体复合材料对于比率发光测温具有吸引力。在此,我们设计了一种 NbO 型 MOF,它具有由含有 π 共轭萘部分和 Zn 2+的四羧酸配体建立的 3D 结构。离子通过溶剂热条件。相当多的规则通道使客体分子罗丹明 B (RhB) 能够被快速吸收。进一步探索了离子交换形成的复合RhB@MOF在生理温度范围内的温度传感行为。RhB@MOF在30-90℃范围内,有机连接体与染料RhB的发光强度比与温度之间表现出极好的线性关系,最大相对温度灵敏度(S r)为0.42%· o C -1在 30°C。这些结果验证了这种热响应材料在灵敏温度检测方面的潜力,并进一步促进了在生理温度范围内工作的比率温度计的发展。
High Capacity Hydrogen Adsorption in Cu(II) Tetracarboxylate Framework Materials: The Role of Pore Size, Ligand Functionalization, and Exposed Metal Sites
作者:Xiang Lin、Irvin Telepeni、Alexander J. Blake、Anne Dailly、Craig M. Brown、Jason M. Simmons、Marco Zoppi、Gavin S. Walker、K. Mark Thomas、Timothy J. Mays、Peter Hubberstey、Neil R. Champness、Martin Schröder
DOI:10.1021/ja806624j
日期:2009.2.18
A series of isostructural metal-organic framework polymers of composition [Cu-2(L)(H2O)(2)] (L=tetracarboxylate ligands), denoted NOTT-nnn, has been synthesized and characterized. Single crystal X-ray structures confirm the complexes to contain binuclear Cu(II) paddlewheel nodes each bridged by four carboxylate centers to give a NbO-type network of 6(4).8(2) topology. These complexes are activated by solvent exchange with acetone coupled to heating cycles under vacuum to afford the desolvated porous materials NOTT-100 to NOTT-109. These incorporate a vacant coordination site at each Cu(II) center and have large pore volumes that contribute to the observed high H-2 adsorption. Indeed, NOTT-103 at 77 K and 60 bar shows a very high total H-2 adsorption of 77.8 mg g(-1) equivalent to 7.78 wt% [wt% = (weight of adsorbed H-2)/(weight of host material)] or 7.22 wt% [wt% = 100(weight of adsorbed H2)/(weight of host material + weight of adsorbed H-2)]. Neutron powder diffraction studies on NOTT-101 reveal three adsorption sites for this material: at the exposed Cu(II) coordination site, at the pocket formed by three Cu-2} paddle wheels, and at the cusp of three phenyl rings. Systematic virial analysis of the H2 isotherms suggests that the H2 binding energies at these sites are very similar and the differences are smaller than 1.0 kJ mol(-1), although the adsorption enthalpies for H-2 at the exposed Cu(II) site are significantly affected by pore metrics. Introducing methyl groups or using kinked ligands to create smaller pores can enhance the isosteric heat of adsorption and improve H-2 adsorption. However, although increasing the overlap of potential energy fields of pore walls increases the heat of H-2 adsorption at low pressure, it may be detrimental to the overall adsorption capacity by reducing the pore volume.
METAL-ORGANIC FRAMEWORKS (MOF) FOR GAS CAPTURE
申请人:The University of Nottingham
公开号:US20150047505A1
公开(公告)日:2015-02-19
The present invention relates to a metal organic framework comprising of a metal ion (M) and an organic ligand wherein more than one hydroxy ligand are present about the metal ion. Also provided is a method for synthesising the metal-organic frameworks and their application in areas including scrubbing exhaust gas streams of acidic gases, scrubbing natural gas of acidic gases by separation or sequestration and separating C
2
H
a
or other VOC gases from other gas mixtures.