CFA-18: a homochiral metal–organic framework (MOF) constructed from rigid enantiopure bistriazolate linker molecules

2020 ◽  
Vol 49 (44) ◽  
pp. 15758-15768
Author(s):  
Katharina Knippen ◽  
Björn Bredenkötter ◽  
Lisa Kanschat ◽  
Maryana Kraft ◽  
Tom Vermeyen ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic ◽  
Coordination Framework ◽  
Linker Molecules ◽  
Organic Framework

In this work, we introduce a novel enantiopure chiral spiro bistriazolate linker molecule (H2-bibta) and the corresponding first enantiopure bistriazolate-based metal–organic framework, CFA-18 (Coordination Framework Augsburg-18).

A bracket approach to improve the stability and gas sorption performance of a metal–organic framework via in situ incorporating the size-matching molecular building blocks

2016 ◽  
Vol 52 (54) ◽  
pp. 8413-8416 ◽  
Author(s):  
Di-Ming Chen ◽  
Jia-Yue Tian ◽  
Chun-Sen Liu ◽  
Miao Du
Keyword(s):  
Metal Organic Framework ◽  
Building Blocks ◽  
Gas Sorption ◽  
Molecular Building Blocks ◽  
Metal Organic ◽  
Coordination Framework ◽  
The Stability ◽  
Organic Framework

The robustness and gas sorption performance of a coordination framework can be greatly improved by incorporating size-matching molecular building blocks.

scholarly journals The Modulating Effect of Ethanol on the Morphology of a Zr-based Metal-Organic Framework under Room Temperature in the Cosolvent System

2021 ◽  
Author(s):  
Yunzhuo Li ◽  
Zirong Tang ◽  
Chen Chen
Keyword(s):  
Metal Ion ◽  
Room Temperature ◽  
Metal Organic Framework ◽  
Solvent Ratio ◽  
Marangoni Flow ◽  
Flow Effect ◽  
Ion Clusters ◽  
Metal Organic ◽  
Linker Molecules ◽  
Organic Framework

We report that ethanol, used together with water, plays a crucial role in tuning the structures of a zirconium-based Metal-Organic Framework, the 12-connected MOF-801, and the possible mechanisms of this modulating effect. By employing the cosolvent system of ethanol and water just under room temperature without the presence of a monotopic carboxylic acid as the modulator, MOF-801 in various morphologies of different sizes can be synthesized. The linear correlation between the ethanol/water ratio and the crystal sizes is also demonstrated. The growth mechanism is mainly explained by ethanol’s binding with the metal ion clusters and the Marangoni Flow Effect. Ethanol competes with the linker molecules in coordinating with the Zr metal clusters, a role similar to that of the modulators. The Marangoni Flow Effect, which dominates at a certain solvent ratio, further promotes the 1-D alignment of the MOF-801 crystals.

scholarly journals Crystal structure of a low-spin poly[di-μ3-cyanido-di-μ2-cyanido-bis(μ2-2-ethylpyrazine)dicopper(I)iron(II)]

2019 ◽  
Vol 75 (8) ◽  
pp. 1205-1208
Author(s):  
Sofiia V. Partsevska ◽  
Dina D. Naumova ◽  
Igor P. Matushko ◽  
Olesia I. Kucheriv ◽  
Il'ya A. Gural'skiy
Keyword(s):  
Crystal Structure ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
Tetrahedral Coordination ◽  
Common Edge ◽  
Coordination Environment ◽  
Metal Organic ◽  
Coordination Framework ◽  
Organic Framework

In the title metal–organic framework, [Fe(C6H8N2)2{Cu(CN)2}2] n , the low-spin FeII ion lies at an inversion centre and displays an elongated octahedral [FeN6] coordination environment. The axial positions are occupied by two symmetry-related bridging 2-ethylpyrazine ligands, while the equatorial positions are occupied by four N atoms of two pairs of symmetry-related cyanide groups. The CuI centre is coordinated by three cyanide carbon atoms and one N atom of a bridging 2-ethylpyrazine molecule, which form a tetrahedral coordination environment. Two neighbouring Cu atoms have a short Cu...Cu contact [2.4662 (7) Å] and their coordination tetrahedra are connected through a common edge between two C atoms of cyanide groups. Each Cu2(CN)2 unit, formed by two neighbouring Cu atoms bridged by two carbons from a pair of μ-CN groups, is connected to six FeII centres via two bridging 2-ethylpyrazine molecules and four cyanide groups, resulting in the formation of a polymeric three-dimensional metal–organic coordination framework.

scholarly journals The Modulating Effect of Ethanol on the Morphology of a Zr-Based Metal–Organic Framework at Room Temperature in a Cosolvent System

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 434
Author(s):  
Yunzhuo Li ◽  
Zirong Tang ◽  
Chen Chen
Keyword(s):  
Metal Ion ◽  
Room Temperature ◽  
Metal Organic Framework ◽  
Solvent Ratio ◽  
Marangoni Flow ◽  
Flow Effect ◽  
Ion Clusters ◽  
Metal Organic ◽  
Linker Molecules ◽  
Organic Framework

We report that ethanol, used together with water, plays a crucial role in tuning the structures of a zirconium-based metal–organic framework and the 12-connected MOF-801, as well as the possible mechanisms of this modulating effect. By employing a cosolvent system of ethanol and water at just under room temperature without the presence of a monotopic carboxylic acid as the modulator, MOF-801 in various morphologies of different sizes could be synthesized. A linear correlation between the ethanol/water ratio and the crystal sizes is also demonstrated. The growth mechanism is mainly explained by ethanol’s bonding with the metal ion clusters and the Marangoni flow effect. Ethanol competes with the linker molecules in coordinating with the Zr metal clusters, a role similar to that of the modulators. The Marangoni flow effect, which dominates at a certain solvent ratio, further promotes the 1D alignment of the MOF-801 crystals.

A channel-type mesoporous In(iii)–carboxylate coordination framework with high physicochemical stability for use as an electrode material in supercapacitors

2014 ◽  
Vol 2 (25) ◽  
pp. 9828-9834 ◽  
Author(s):  
Miao Du ◽  
Min Chen ◽  
Xiao-Gang Yang ◽  
Jiong Wen ◽  
Xi Wang ◽  
...  
Keyword(s):  
Electrode Material ◽  
Metal Organic Framework ◽  
Promising Candidate ◽  
Physicochemical Stability ◽  
Metal Organic ◽  
Coordination Framework ◽  
Mesoporous Metal ◽  
Channel Type ◽  
Organic Framework

A mesoporous metal–organic framework with perfect 1-D hexagonal channels and high physicochemical stability represents a promising candidate for use as an electrode material in supercapacitors.

Multifunctional metal–organic framework heterostructures for enhanced cancer therapy

2021 ◽  
Author(s):  
Jintong Liu ◽  
Jing Huang ◽  
Lei Zhang ◽  
Jianping Lei
Keyword(s):  
Cancer Therapy ◽  
General Principle ◽  
Biomedical Applications ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Functional Modulation ◽  
Organic Framework

We review the general principle of the design and functional modulation of nanoscaled MOF heterostructures, and biomedical applications in enhanced therapy.

Magnetic Ordering via Itinerant Ferromagnetism in a Metal-Organic Framework

2020 ◽  
Author(s):  
Jesse Park ◽  
Brianna Collins ◽  
Lucy Darago ◽  
Tomce Runcevski ◽  
Michael Aubrey ◽  
...  
Keyword(s):  
Charge Transport ◽  
Magnetic Order ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Magnetic Ordering ◽  
Double Exchange ◽  
Itinerant Ferromagnetism ◽  
Organic Solids ◽  
Metal Organic ◽  
Organic Framework

<b>Materials that combine magnetic order with other desirable physical attributes offer to revolutionize our energy landscape. Indeed, such materials could find transformative applications in spintronics, quantum sensing, low-density magnets, and gas separations. As a result, efforts to design multifunctional magnetic materials have recently moved beyond traditional solid-state materials to metal–organic solids. Among these, metal–organic frameworks in particular bear structures that offer intrinsic porosity, vast chemical and structural programmability, and tunability of electronic properties. Nevertheless, magnetic order within metal–organic frameworks has generally been limited to low temperatures, owing largely to challenges in creating strong magnetic exchange in extended metal–organic solids. Here, we employ the phenomenon of itinerant ferromagnetism to realize magnetic ordering at <i>T</i><sub>C</sub> = 225 K in a mixed-valence chromium(II/III) triazolate compound, representing the highest ferromagnetic ordering temperature yet observed in a metal–organic framework. The itinerant ferromagnetism is shown to proceed via a double-exchange mechanism, the first such observation in any metal–organic material. Critically, this mechanism results in variable-temperature conductivity with barrierless charge transport below <i>T</i><sub>C</sub> and a large negative magnetoresistance of 23% at 5 K. These observations suggest applications for double-exchange-based coordination solids in the emergent fields of magnetoelectrics and spintronics. Taken together, the insights gleaned from these results are expected to provide a blueprint for the design and synthesis of porous materials with synergistic high-temperature magnetic and charge transport properties. </b>

Solvent-Free Powder Synthesis and MOF-CVD Thin Films of the Mesoporous Metal-Organic Framework MAF-6

2019 ◽  
Author(s):  
Timothée Stassin ◽  
Ivo Stassen ◽  
Joao Marreiros ◽  
Alexander John Cruz ◽  
Rhea Verbeke ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Metal Organic Framework ◽  
Chemical Vapor ◽  
Uptake Capacity ◽  
Powder Synthesis ◽  
Crystalline Films ◽  
Metal Organic ◽  
Mesoporous Metal ◽  
First Time ◽  
Organic Framework

A simple solvent- and catalyst-free method is presented for the synthesis of the mesoporous metal-organic framework (MOF) MAF-6 (RHO-Zn(eIm)2) based on the reaction of ZnO with 2-ethylimidazole vapor at temperatures ≤ 100 °C. By translating this method to a chemical vapor deposition (CVD) protocol, mesoporous crystalline films could be deposited for the first time entirely from the vapor phase. A combination of PALS and Kr physisorption measurements confirmed the porosity of these MOF-CVD films and the size of the MAF-6 supercages (diam. ~2 nm), in close agreement with powder data and calculations. MAF-6 powders and films were further characterized by XRD, TGA, SEM, FTIR, PDF and EXAFS. The exceptional uptake capacity of the mesoporous MAF-6 in comparison to the microporous ZIF-8 is demonstrated by vapor-phase loading of a molecule larger than the ZIF-8 windows.

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