Microporous metal–organic frameworks with open metal sites and π-Lewis acidic pore surfaces for recovering ethylene from polyethylene off-gas

2018 ◽  
Vol 6 (42) ◽  
pp. 20822-20828 ◽  
Author(s):  
Yingxiang Ye ◽  
Zhenlin Ma ◽  
Liangji Chen ◽  
Haizhen Lin ◽  
Quanjie Lin ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Uptake Capacity ◽  
Gas Uptake ◽  
Open Metal Sites ◽  
Metal Organic

By employing electron-deficient ligands to fabricate MOFs, we could not only improve gas uptake capacity, but also stabilize the framework robustness.

Significant enhancement of gas uptake capacity and selectivity via the judicious increase of open metal sites and Lewis basic sites within two polyhedron-based metal–organic frameworks

2016 ◽  
Vol 52 (15) ◽  
pp. 3223-3226 ◽  
Author(s):  
Bing Liu ◽  
Shuo Yao ◽  
Chao Shi ◽  
Guanghua Li ◽  
Qisheng Huo ◽  
...  
Keyword(s):  
High Performance ◽  
Metal Organic Frameworks ◽  
High Density ◽  
Significant Enhancement ◽  
Uptake Capacity ◽  
Gas Uptake ◽  
Basic Sites ◽  
Open Metal Sites ◽  
Metal Organic

Two novel PMOFs with a high density of OMSs and LBSs were assembled using the SBB strategy and exhibited a high performance for CO2 capture and separation towards CO2, C2H6 and C3H8 over CH4.

Tuning the Redox Activity of Metal−Organic Frameworks for Enhanced, Selective O2 Binding

2019 ◽  
Author(s):  
Andrew Rosen ◽  
M. Rasel Mian ◽  
Timur Islamoglu ◽  
Haoyuan Chen ◽  
Omar Farha ◽  
...  
Keyword(s):  
Density Functional ◽  
Metal Organic Frameworks ◽  
Redox Activity ◽  
Screening Methods ◽  
Bridging Ligands ◽  
Metal Centers ◽  
Computational Screening ◽  
Open Metal Sites ◽  
Metal Organic ◽  
Unsaturated Metal Sites

<p>Metal−organic frameworks (MOFs) with coordinatively unsaturated metal sites are appealing as adsorbent materials due to their tunable functionality and ability to selectively bind small molecules. Through the use of computational screening methods based on periodic density functional theory, we investigate O<sub>2</sub> and N<sub>2</sub> adsorption at the coordinatively unsaturated metal sites of several MOF families. A variety of design handles are identified that can be used to modify the redox activity of the metal centers, including changing the functionalization of the linkers (replacing oxido donors with sulfido donors), anion exchange of bridging ligands (considering μ-Br<sup>-</sup>, μ-Cl<sup>-</sup>, μ-F<sup>-</sup>, μ-SH<sup>-</sup>, or μ-OH<sup>-</sup> groups), and altering the formal oxidation state of the metal. As a result, we show that it is possible to tune the O<sub>2</sub> affinity at the open metal sites of MOFs for applications involving the strong and/or selective binding of O<sub>2</sub>. In contrast with O<sub>2</sub> adsorption, N<sub>2</sub> adsorption at open metal sites is predicted to be relatively weak across the MOF dataset, with the exception of MOFs containing synthetically elusive V<sup>2+</sup> open metal sites. As one example from the screening study, we predict that exchanging the μ-Cl<sup>-</sup> ligands of M<sub>2</sub>Cl<sub>2</sub>(BBTA) (H<sub>2</sub>BBTA = 1<i>H</i>,5<i>H</i>-benzo(1,2-d:4,5-d′)bistriazole) with μ-OH<sup>-</sup> groups would significantly enhance the strength of O<sub>2</sub> adsorption at the open metal sites without a corresponding increase in the N<sub>2</sub> affinity. Experimental investigation of Co<sub>2</sub>Cl<sub>2</sub>(BBTA) and Co<sub>2</sub>(OH)<sub>2</sub>(BBTA) confirms that the former exhibits only weak physisorption, whereas the latter is capable of chemisorbing O<sub>2</sub> at room temperature. The chemisorption behavior is attributed to the greater electron-donating character of the μ-OH<sup>-</sup><sub> </sub>ligands and the presence of H-bonding interactions between the μ-OH<sup>-</sup> bridging ligands and the O<sub>2</sub> adsorbate.</p>

scholarly journals Innenrücktitelbild: Understanding CO2Dynamics in Metal-Organic Frameworks with Open Metal Sites (Angew. Chem. 16/2013)

2013 ◽  
Vol 125 (16) ◽  
pp. 4589-4589
Author(s):  
Li-Chiang Lin ◽  
Jihan Kim ◽  
Xueqian Kong ◽  
Eric Scott ◽  
Thomas M. McDonald ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Open Metal Sites ◽  
Metal Organic

Using Site Heterogeneity in Metal–Organic Frameworks with Bimetallic Open Metal Sites for Olefin/Paraffin Separations

2020 ◽  
Vol 3 (6) ◽  
pp. 5291-5300
Author(s):  
Wenqin You ◽  
Trisha Sen ◽  
Yoshiaki Kawajiri ◽  
Matthew J. Realff ◽  
David S. Sholl
Keyword(s):  
Metal Organic Frameworks ◽  
Open Metal Sites ◽  
Site Heterogeneity ◽  
Metal Organic

scholarly journals Retrofitting metal-organic frameworks

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Christian Schneider ◽  
David Bodesheim ◽  
Julian Keupp ◽  
Rochus Schmid ◽  
Gregor Kieslich
Keyword(s):  
Thermal Expansion ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Computational Framework ◽  
Expansion Behavior ◽  
Open Metal Sites ◽  
Metal Organic ◽  
Set Up ◽  
Linker Molecules

Abstract The post-synthetic installation of linker molecules between open-metal sites (OMSs) and undercoordinated metal-nodes in a metal-organic framework (MOF) — retrofitting — has recently been discovered as a powerful tool to manipulate macroscopic properties such as the mechanical robustness and the thermal expansion behavior. So far, the choice of cross linkers (CLs) that are used in retrofitting experiments is based on qualitative considerations. Here, we present a low-cost computational framework that provides experimentalists with a tool for evaluating various CLs for retrofitting a given MOF system with OMSs. After applying our approach to the prototypical system CL@Cu3BTC2 (BTC = 1,3,5-benzentricarboxylate) the methodology was expanded to NOTT-100 and NOTT-101 MOFs, identifying several promising CLs for future CL@NOTT-100 and CL@NOTT-101 retrofitting experiments. The developed model is easily adaptable to other MOFs with OMSs and is set-up to be used by experimentalists, providing a guideline for the synthesis of new retrofitted MOFs with modified physicochemical properties.

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