scholarly journals Host-Guest Interactions Between Metal–Organic Frameworks and Air-Sensitive Complexes at High Temperature

2021 ◽  
Vol 9 ◽  
Author(s):  
Bo Huang ◽  
Zhe Tan
Keyword(s):  
High Temperature ◽  
Metal Complexes ◽  
High Temperatures ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Synthetic Methods ◽  
Infiltration Process ◽  
Metal Organic

The host-guest chemistry of metal–organic frameworks (MOFs) has been attracting increasing attention owing to the outstanding properties derived from MOFs-guests combinations. However, there are large difficulties involved in the syntheses of the host-guest MOF systems with air-sensitive metal complexes. In addition, the behaviors on host-guest interactions in the above systems at high temperature are not clear. This study reported the synthetic methods for host-guest systems of metal–organic framework and air-sensitive metal complexes via a developed chemical vapor infiltration process. With the synchrotron X-ray powder diffraction (XRPD) measurements and Fourier Transform infrared spectroscopy (FTIR), the successful loadings of Fe(CO)5 in HKUST-1 and NH2-MIL-101(Al) have been confirmed. At high temperatures, the structural and chemical componential changes were investigated in detail by XRPD and FTIR measurements. HKUST-1 was proven to have strong interaction with Fe(CO)5 and resulted in a heavy loading amount of 63.1 wt%, but too strong an interaction led to deformation of HKUST-1 sub-unit under heating conditions. NH2-MIL-101(Al), meanwhile, has a weaker interaction and is chemically inert to Fe(CO)5 at high temperatures.

From metal–organic frameworks to magnetic nanostructured porous carbon composites: towards highly efficient dye removal and degradation

RSC Advances ◽  
2015 ◽  
Vol 5 (11) ◽  
pp. 8228-8235 ◽  
Author(s):  
Cong Zhang ◽  
Fanggui Ye ◽  
Shufen Shen ◽  
Yuhao Xiong ◽  
Linjing Su ◽  
...  
Keyword(s):  
High Temperature ◽  
Porous Carbon ◽  
Carbon Material ◽  
Dye Removal ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Porous Carbon Material ◽  
Carbon Composites ◽  
Highly Efficient ◽  
Metal Organic

A magnetic nanostructured porous carbon material (γ-Fe2O3/C) was easily synthesized using a microwave-enhanced high-temperature ionothermal method with an iron terephthalate metal–organic framework-MIL-53(Fe), as a template.

A Li+ conductive metal organic framework electrolyte boosts the high-temperature performance of dendrite-free lithium batteries

2019 ◽  
Vol 7 (16) ◽  
pp. 9530-9536 ◽  
Author(s):  
Nan Chen ◽  
Yuejiao Li ◽  
Yujuan Dai ◽  
Wenjie Qu ◽  
Yi Xing ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Lithium Batteries ◽  
Metal Organic Framework ◽  
Lithium Metal ◽  
Temperature Performance ◽  
Metal Organic ◽  
Organic Framework

Conventional electrolytes of Li metal batteries are highly flammable and volatile, which accelerates the consumption of lithium metal at high temperatures, resulting in catastrophic fires or explosions.

scholarly journals Recent Developments in the Synthesis and Applications of Metal Organic Framework: A Concise Review

2021 ◽  
Vol 33 (5) ◽  
pp. 956-962
Author(s):  
Chandan Adhikari ◽  
Rehana Farooq
Keyword(s):  
Drug Delivery ◽  
Porous Materials ◽  
Electrochemical Sensors ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Inorganic Materials ◽  
Synthetic Methods ◽  
Concise Review ◽  
Metal Organic ◽  
Organic Framework

Metal organic frameworks (MOFs) are one of those compounds which have drawn attention in various applications due to their several interesting properties like tunable shape, size, pore size, easy functionalization, high surface area, pore volume, etc. Metal organic frameworks due to their uniform structures, tunable porosity, wide variety and stability on various topology, geometry, dimension and chemical functions of the molecular network give a remarkable structural diversity in comparison to other porous materials. This enables scientists to handle numerous framework structures, porosity and functionality effectively. The unique structural architecture and tunable properties of MOF’s makes them an interesting hybrid material consisting of organic and inorganic materials. MOF can be randomly constructed like Lego bricks and superior in terms of versatility in comparisson to other porous materials. A number of MOFs containing a wide variety of metal e.g. zinc, copper, iron, aluminium, magnesium, chromium, zirconium, gadolinium, manganese are gaining rapid growth in commercial markets for gas storage, adsorption, separation and catalytic applications. This concise review emphasizes various synthetic methods e.g. solvothermal process, hydrothermal synthesis, electrochemical synthesis, microwave synthesis, sonochemical synthesis, mechanochemical synthesis, of metal organic framework developed in the last few decades. It also addresses various applications of metal organic framework e.g. hydrogen storage, gas adsorption, drug delivery systems and bioimaging agents, biocatalysts, biosensors, electrochemical sensors, etc. It also comments on various challenges and futuristic applications of metal organic frameworks in various field e.g. liquid wate management, gaseous waste management, sunlight assisted catalysis, water purification, building materials, electronic devices, battery technologies, targeted drug delivery, solar cells, etc. of science and technology in coming decades.

scholarly journals Functionalising metal–organic frameworks with metal complexes: the role of structural dynamics

CrystEngComm ◽  
2015 ◽  
Vol 17 (40) ◽  
pp. 7632-7635 ◽  
Author(s):  
Ana E. Platero-Prats ◽  
Antonio Bermejo Gómez ◽  
Karena W. Chapman ◽  
Belén Martín-Matute ◽  
Xiaodong Zou
Keyword(s):  
Metal Complexes ◽  
Structural Dynamics ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Metal Organic ◽  
The Impact ◽  
Organic Framework

The impact of dynamics in the functionalisation of metal–organic framework UiO-67 with an Ir-complex has been studied. Highly functionalised Ir-UiO-67 can be only trapped as kinetic products, which lose metals and exchange species to gain stability.

scholarly journals High temperature expulsion of thermolabile groups for pore-space expansion in metal–organic frameworks

CrystEngComm ◽  
2019 ◽  
Vol 21 (1) ◽  
pp. 60-64 ◽  
Author(s):  
Macguire R. Bryant ◽  
Timothy A. Ablott ◽  
Shane G. Telfer ◽  
Lujia Liu ◽  
Christopher Richardson
Keyword(s):  
High Temperature ◽  
Pore Space ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Radiative Heating ◽  
Metal Organic ◽  
Space Expansion ◽  
Organic Framework

Direct radiative heating at 200 °C quantitatively converts sulfoxide-tags to desirable vinyl groups on a porous zinc(ii) metal–organic framework analogue of IRMOF-9.

The low dielectric constant and relaxation dielectric behavior in hydrogen-bonding metal–organic frameworks

RSC Advances ◽  
2015 ◽  
Vol 5 (56) ◽  
pp. 45213-45216 ◽  
Author(s):  
Shan-Shan Yu ◽  
Guo-Jun Yuan ◽  
Hai-Bao Duan
Keyword(s):  
Dielectric Constant ◽  
Hydrogen Bonding ◽  
High Temperature ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Dielectric Behavior ◽  
Low Dielectric Constant ◽  
Low Dielectric ◽  
Metal Organic ◽  
Organic Framework

A 3D hydrogen-bonding metal–organic framework shows a low dielectric constant and relaxation dielectric behavior at high temperature.

scholarly journals High temperature ferromagnetism in π-conjugated two-dimensional metal–organic frameworks

2017 ◽  
Vol 8 (4) ◽  
pp. 2859-2867 ◽  
Author(s):  
Wenbin Li ◽  
Lei Sun ◽  
Jingshan Qi ◽  
Pablo Jarillo-Herrero ◽  
Mircea Dincă ◽  
...  
Keyword(s):  
High Temperature ◽  
Magnetic Anisotropy ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Two Dimensional ◽  
Half Metallic ◽  
Metal Organic ◽  
Organic Framework

Simulations demonstrate the critical roles of π-conjugation and large magnetic anisotropy in realizing high-temperature ferromagnetic 2D metal–organic framework, which is also half-metallic.

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>

Engineering Porosity Through Defects in a Giant Pore Metal–Organic Framework

2020 ◽  
Author(s):  
Adam Sapnik ◽  
Duncan Johnstone ◽  
Sean M. Collins ◽  
Giorgio Divitini ◽  
Alice Bumstead ◽  
...  
Keyword(s):  
Distribution Function ◽  
Ball Milling ◽  
Local Structure ◽  
Pair Distribution Function ◽  
Function Analysis ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Defect Engineering ◽  
Metal Organic ◽  
Unsaturated Metal Sites

<p>Defect engineering is a powerful tool that can be used to tailor the properties of metal–organic frameworks (MOFs). Here, we incorporate defects through ball milling to systematically vary the porosity of the giant pore MOF, MIL-100 (Fe). We show that milling leads to the breaking of metal–linker bonds, generating more coordinatively unsaturated metal sites, and ultimately causes amorphisation. Pair distribution function analysis shows the hierarchical local structure is partially</p><p>retained, even in the amorphised material. We find that the solvent toluene stabilises the MIL-100 (Fe) framework against collapse and leads to a substantial rentention of porosity over the non-stabilised material.</p>

Metal-Organic Frameworks vs. Buffers: Case Study of UiO-66 Stability

2020 ◽  
Author(s):  
Daniel Bůžek ◽  
Slavomír Adamec ◽  
Kamil Lang ◽  
Jan Demel
Keyword(s):  
Inductively Coupled Plasma ◽  
Buffer Capacity ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Analytical Techniques ◽  
Aqueous Dispersions ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Metal Organic

<div><p>UiO-66 is a zirconium-based metal-organic framework (MOF) that has numerous applications. Our group recently determined that UiO-66 is not as inert in aqueous dispersions as previously reported in the literature. The present work therefore assessed the behaviour of UiO-66 in buffers: 2-amino-2-(hydroxymethyl)-1,3-propanediol (TRIS), 4-(2-hydroxyethyl)piperazine-1-ethane sulfonic acid (HEPES), N-ethylmorpholine (NEM) and phosphate buffer (PB), all of which are commonly used in many UiO-66 applications. High pressure liquid chromatography and inductively coupled plasma mass spectrometry were used to monitor degradation of the MOF. In each buffer, the terephthalate linker was released to some extent, with a more pronounced leaching effect in the saline forms of these buffers. The HEPES buffer was found to be the most benign, whereas NEM and PB should be avoided at any concentration as they were shown to rapidly degrade the UiO-66 framework. Low concentration TRIS buffers are also recommended, although these offer minimal buffer capacity to adjust pH. Regardless of the buffer used, rapid terephthalate release was observed, indicating that the UiO-66 was attacked immediately after mixing with the buffer. In addition, the dissolution of zirconium, observed in some cases, intensified the UiO-66 decomposition process. These results demonstrate that sensitive analytical techniques have to be used to monitor the release of MOF components so as to quantify the stabilities of these materials in liquid environments.</p></div>

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