An investigation of a series of layered Zn-1,4-diazabicyclo[2.2.2]octane metal–organic frameworks: local structure and adsorption properties of mixed-metal centre

2020 ◽  
Vol 77 (1) ◽  
Author(s):  
Chang-Chun Ding ◽  
Xiao-Hong Chu ◽  
Meng-Jia Zhang ◽  
Jia Fu
Keyword(s):  
Adsorption Isotherms ◽  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Adsorption Properties ◽  
Paramagnetic Resonance ◽  
Mixed Metal ◽  
Local Structures ◽  
Different Temperatures ◽  
Metal Organic ◽  
Epr Parameters

The mixed-metal pillar-layered metal–organic frameworks of Zn(bdc)(DABCO)0.5, Zn0.5Cu0.5(bdc)(DABCO)0.5 and Cu(bdc)(DABCO)0.5 (bdc = 1,4-benzenedicarboxylate, DABCO = 1,4-diazabicyclo[2.2.2]octane) are investigated for their local structures and gas adsorption properties. According to the obtained electron paramagnetic resonance (EPR) spectra, the distorted structures around Cu2+ are proposed to be tetragonally and orthorhombically elongated [CuO4N] with the well fitted high-order perturbation formulae of the EPR parameters. Due to the doped Cu2+, the adsorption isotherms of industrially relevant gases (CO2, CO, CH4 and N2) and lower alkanes (CH4, C2H6, C3H8, C4H10 and C5H12) are different, especially at different temperatures. By combining the structural properties and adsorption isotherms, a comprehensive study suggests that the ZnDABCO series can be a controllable tool in gas storage and separation.

Investigations of the temperature-dependent electron paramagnetic resonance spectra and local structures for a cobalt(II) porphyrin complex within a metal–organic framework

2019 ◽  
Vol 75 (3) ◽  
pp. 318-324
Author(s):  
Chang-Chun Ding ◽  
Zhi-Xiang Fan ◽  
Zhen Wu
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Relative Elongation ◽  
Metal Organic Framework ◽  
Paramagnetic Resonance ◽  
Local Structures ◽  
Different Temperatures ◽  
Metal Organic ◽  
Epr Parameters ◽  
Electron Paramagnetic ◽  
Organic Framework

The interaction between an adsorbed CO molecule and the unsaturated coordinated Co2+center in the metal–organic framework (MOF) PCN-224 is investigated by analyzing the electron paramagnetic resonance (EPR) parameters (gfactors and hyperfine structure constants) and the adsorption energies at various temperatures. Six- and five-coordinated octahedral models (four planar N with two and one axial CO molecules, respectively) are constructed to simulate the local structures of the Co2+centers at different temperatures. Because of the Jahn–Teller effect of the Co2+centers, the C2–Co–N4and C–Co–N4combinations undergo different tetragonal elongation distortions along theC4axis, characterized by the relative elongation ΔZand displacement ΔZ′ of Co2+at different temperatures. Given the agreement between the calculated and experimental EPR parameters, as well as the adsorption properties, the six- and five-coordinated models are regarded as suitable for low- and high-temperature systems, respectively. These studies may be helpful to understand the properties of similar MOFs with adsorbed molecules under the effect of ambient temperature.

Xe adsorption and separation properties of a series of microporous metal–organic frameworks (MOFs) with V-shaped linkers

2017 ◽  
Vol 5 (32) ◽  
pp. 16611-16615 ◽  
Author(s):  
Debasis Banerjee ◽  
Sameh K. Elsaidi ◽  
Praveen K. Thallapally
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Adsorption Properties ◽  
Metal Organic

A series of microporous metal–organic frameworks (MOFs) constructed by using a V-shaped linker, 4,4′-sulfonyldibenzoic acid, were evaluated for their Xe gas adsorption properties.

Tuning the interpenetration of metal–organic frameworks through changing ligand functionality: effect on gas adsorption properties

CrystEngComm ◽  
2020 ◽  
Vol 22 (3) ◽  
pp. 506-514 ◽  
Author(s):  
Bin Li ◽  
Qing-Qing Yan ◽  
Zhi-Qiang Xu ◽  
Ying-Bo Xu ◽  
Guo-Ping Yong
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Adsorption Properties ◽  
Metal Organic

Two interpenetrated MOFs are constructed with a 2-connected ligand, whereas one non-interpenetrated MOF is constructed by using a 3-connected ligand.

New Metal–Organic Frameworks Constructed from the 4-Imidazole-Carboxylate Ligand: Structural Diversities, Luminescence, and Gas Adsorption Properties

2014 ◽  
Vol 14 (8) ◽  
pp. 3727-3741 ◽  
Author(s):  
Shui-Sheng Chen ◽  
Qing Liu ◽  
Yue Zhao ◽  
Rui Qiao ◽  
Liang-Quan Sheng ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Adsorption Properties ◽  
Carboxylate Ligand ◽  
Metal Organic

Gas adsorption properties of highly porous metal–organic frameworks containing functionalized naphthalene dicarboxylate linkers

2014 ◽  
Vol 43 (48) ◽  
pp. 18017-18024 ◽  
Author(s):  
Jaeung Sim ◽  
Haneul Yim ◽  
Nakeun Ko ◽  
Sang Beom Choi ◽  
Youjin Oh ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Porous Metal ◽  
Adsorption Properties ◽  
Metal Organic ◽  
Highly Porous

Diverse structures of metal–organic frameworks based on different metal ions: luminescence and gas adsorption properties

2015 ◽  
Vol 44 (9) ◽  
pp. 4238-4245 ◽  
Author(s):  
Chuan-Lei Zhang ◽  
Ling Qin ◽  
Zhen-Zhen Shi ◽  
He-Gen Zheng
Keyword(s):  
Metal Ions ◽  
Spectral Properties ◽  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Adsorption Properties ◽  
Metal Organic ◽  
Topological Characteristics ◽  
Solvothermal Conditions

Diverse structures of metal–organic frameworks induced by different metal ions under solvothermal conditions exhibit different topological characteristics and spectral properties.

scholarly journals Upgrading the Hydrogen Storage of MOF-5 by Post-Synthetic Exchange with Divalent Metal Ions

2021 ◽  
Vol 11 (24) ◽  
pp. 11687
Author(s):  
Abdul Malik P. Peedikakkal ◽  
Isam H. Aljundi
Keyword(s):  
Metal Ions ◽  
Adsorption Isotherms ◽  
Metal Organic Frameworks ◽  
Hydrogen Uptake ◽  
Metal Exchange ◽  
Mixed Metal ◽  
H2 Adsorption ◽  
Hydrogen Molecules ◽  
Metal Metal ◽  
Metal Organic

In metal-organic frameworks (MOFs), mixed-metal clusters have the opportunity to adsorb hydrogen molecules due to a greater charge density of the metal. Such interactions may subsequently enhance the gravimetric uptake of hydrogen. However, only a few papers have explored the ability of mixed-metal MOFs to increase hydrogen uptake. The present work reveals the preparation of mixed metal metal-organic frameworks M-MOF-5 (where M = Ni2+, Co2+, and Fe2+) (where MOF-5 designates MOFs such as Zn2+ and 1,4-benzenedicarboxylic acid ligand) using the post-synthetic exchange (PSE) technique. Powder X-ray diffraction patterns and scanning electron microscopy images indicate the presence of crystalline phases after metal exchange, and the inductively coupled plasma–mass spectroscopy analysis confirmed the exchange of metals by means of the PSE technique. The nitrogen adsorption isotherms established the production of microporous M-MOF-5. Although the additional metal ions decreased the surface area, the exchanged materials displayed unique features in the gravimetric uptake of hydrogen. The parent MOF-5 and the metal exchanged materials (Ni-MOF-5, Co-MOF-5, and Fe-MOF-5) demonstrated hydrogen capacities of 1.46, 1.53, 1.53, and 0.99 wt.%, respectively. The metal-exchanged Ni-MOF-5 and Co-MOF-5 revealed slightly higher H2 uptake in comparison with MOF-5; however, the Fe-MOF-5 showed a decrease in uptake due to partial discrete complex formation (discrete complexes with one or more metal ions) with less crystalline nature. The Sips model was found to be excellent in describing the H2 adsorption isotherms with a correlation coefficient ≅ 1. The unique hydrogen uptakes of Ni− and Co-MOF-5 shown in this study pave the way for further improvement in hydrogen uptake.

Expanded Porous Metal–Organic Frameworks by SCSC: Organic Building Units Modifying and Enhanced Gas-Adsorption Properties

2016 ◽  
Vol 55 (13) ◽  
pp. 6420-6425 ◽  
Author(s):  
Weidong Fan ◽  
Huan Lin ◽  
Xue Yuan ◽  
Fangna Dai ◽  
Zhenyu Xiao ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Porous Metal ◽  
Adsorption Properties ◽  
Metal Organic

A pair of polymorphous metal–organic frameworks based on an angular diisophthalate linker: synthesis, characterization and gas adsorption properties

2018 ◽  
Vol 47 (3) ◽  
pp. 716-725 ◽  
Author(s):  
Fengli Chen ◽  
Dongjie Bai ◽  
Yao Wang ◽  
Minghui He ◽  
Xiaoxia Gao ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Adsorption Properties ◽  
Metal Organic ◽  
Solvothermal Conditions

A pair of polymorphous MOFs derived from a bent diisophthalate ligand were synthesized by modulating solvothermal conditions, exhibiting comparable gas adsorption properties with respect to C2H2, CO2 and CH4.

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