scholarly journals Chemical Design and Magnetic Ordering in Thin Layers of 2D Metal–Organic Frameworks (MOFs)

2021 ◽  
Author(s):  
Javier López-Cabrelles ◽  
Samuel Mañas-Valero ◽  
Iñigo J. Vitórica-Yrezábal ◽  
Makars Šiškins ◽  
Martin Lee ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Magnetic Ordering ◽  
Thin Layers ◽  
Chemical Design ◽  
Metal Organic

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>

scholarly journals Magnetic ordering in TCNQ-based metal–organic frameworks with host–guest interactions

2015 ◽  
Vol 2 (10) ◽  
pp. 904-911 ◽  
Author(s):  
Xuan Zhang ◽  
Mohamed R. Saber ◽  
Andrey P. Prosvirin ◽  
Joseph H. Reibenspies ◽  
Lei Sun ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Spontaneous Magnetization ◽  
Metal Organic Frameworks ◽  
Magnetic Ordering ◽  
Aromatic Molecules ◽  
Metal Organic ◽  
Magnetization Behavior

Host–guest interactions between the TCNQ-based MOF and aromatic molecules have been found to modulate spontaneous magnetization behavior at low temperatures.

scholarly journals 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>

scholarly journals Understanding the Diversity of the Metal-Organic Framework Ecosystem

2020 ◽  
Author(s):  
Seyed Mohamad Moosavi ◽  
Aditya Nandy ◽  
Kevin Maik Jablonka ◽  
Daniele Ongari ◽  
Jon Paul Janet ◽  
...  
Keyword(s):  
Design Space ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Small Variation ◽  
Chemical Diversity ◽  
Pore Geometry ◽  
Existing Structures ◽  
New Information ◽  
Chemical Design ◽  
Metal Organic

By combining metal nodes and organic linkers one can make millions of different metal-organic frameworks (MOFs). At present over 90,000 MOFs have been synthesized and there are databases with over 500,000 predicted structures. This raises the question whether a new experimental or predicted structure adds new information. For MOF-chemists the chemical design space is a combination of pore geometry, metal nodes, organic linkers, and functional groups, but at present we do not have a formalism to quantify optimal coverage of chemical design space. In this work, we show how machine learning can be used to quantify similarities of MOFs. This quantification allows us to use techniques from ecology to analyse the chemical diversity of these materials in terms of diversity metrics. In particular, we show that this diversity analysis can identify biases in the databases, and how such bias can lead to incorrect conclusions. This formalism provides us with a simple and powerful practical guideline to see whether a set of new structures will have the potential for new insights, or constitute a relatively small variation of existing structures.

Magnetic Ordering in Three-Dimensional Metal–Organic Frameworks Based on Carboxylate Bridged Square-Grid Layers

2011 ◽  
Vol 50 (17) ◽  
pp. 8144-8152 ◽  
Author(s):  
Qian Sun ◽  
Ai-ling Cheng ◽  
Yan-Qin Wang ◽  
Yu Ma ◽  
En-Qing Gao
Keyword(s):  
Metal Organic Frameworks ◽  
Three Dimensional ◽  
Magnetic Ordering ◽  
Square Grid ◽  
Metal Organic

Successive magnetic ordering in two CoII-ladder metal-organic frameworks

2020 ◽  
Author(s):  
Zhu Zhuo ◽  
Guoling Li ◽  
Chenglin Shu ◽  
Wei Wang ◽  
Caiping Liu ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Magnetic Ordering ◽  
Metal Organic

scholarly journals Metal–organic frameworks: possible new two-dimensional magnetic and topological materials

Nanoscale ◽  
2020 ◽  
Vol 12 (46) ◽  
pp. 23620-23625
Author(s):  
Jie Li ◽  
Ruqian Wu
Keyword(s):  
Room Temperature ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Magnetic Ordering ◽  
Two Dimensional ◽  
Framework Materials ◽  
Topological Materials ◽  
Anisotropic Energy ◽  
Out Of Plane ◽  
Metal Organic

New functional two-dimensional metal–organic framework materials with room-temperature magnetic ordering, large out-of-plane magnetic anisotropic energy, huge topological band gap, and excellent spin-filtering performance were theoretically predicted.

Spin-canting magnetization in 3D metal organic frameworks based on strip-shaped Δ-chains

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 76752-76758 ◽  
Author(s):  
Xiu-Mei Zhang ◽  
Peng Li ◽  
Wei Gao ◽  
Jie-Ping Liu
Keyword(s):  
Metal Organic Frameworks ◽  
Magnetic Ordering ◽  
Spin Canting ◽  
Metal Organic

Three 3D frameworks built from strip-shaped Δ-chains were prepared and magnetically characterized. The Cu(ii) compound shows spin canting, magnetic ordering and metamagnetism, while the Co(ii) and Ni(ii) compounds show canted antiferromagnetism.

scholarly journals 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>

scholarly journals Understanding the Diversity of the Metal-Organic Framework Ecosystem

2020 ◽  
Author(s):  
Seyed Mohamad Moosavi ◽  
Aditya Nandy ◽  
Kevin Maik Jablonka ◽  
Daniele Ongari ◽  
Jon Paul Janet ◽  
...  
Keyword(s):  
Design Space ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Small Variation ◽  
Chemical Diversity ◽  
Pore Geometry ◽  
Existing Structures ◽  
New Information ◽  
Chemical Design ◽  
Metal Organic

By combining metal nodes and organic linkers one can make millions of different metal-organic frameworks (MOFs). At present over 90,000 MOFs have been synthesized and there are databases with over 500,000 predicted structures. This raises the question whether a new experimental or predicted structure adds new information. For MOF-chemists the chemical design space is a combination of pore geometry, metal nodes, organic linkers, and functional groups, but at present we do not have a formalism to quantify optimal coverage of chemical design space. In this work, we show how machine learning can be used to quantify similarities of MOFs. This quantification allows us to use techniques from ecology to analyse the chemical diversity of these materials in terms of diversity metrics. In particular, we show that this diversity analysis can identify biases in the databases, and how such bias can lead to incorrect conclusions. This formalism provides us with a simple and powerful practical guideline to see whether a set of new structures will have the potential for new insights, or constitute a relatively small variation of existing structures.

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