scholarly journals Active-Site Modulation in an Fe-Porphyrin-Based Metal–Organic Framework through Ligand Axial Coordination: Accelerating Electrocatalysis and Charge-Transport Kinetics

2020 ◽  
Vol 142 (4) ◽  
pp. 1933-1940 ◽  
Author(s):  
Itamar Liberman ◽  
Ran Shimoni ◽  
Raya Ifraemov ◽  
Illya Rozenberg ◽  
Chanderpratap Singh ◽  
...  
Keyword(s):  
Charge Transport ◽  
Active Site ◽  
Metal Organic Framework ◽  
Transport Kinetics ◽  
Axial Coordination ◽  
Metal Organic ◽  
Organic Framework

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>

Metal-Organic Framework Transistors for Dopamine Sensing

2021 ◽  
Author(s):  
Jiajun Song ◽  
Jianzhong Zheng ◽  
Anneng Yang ◽  
Hong Liu ◽  
Zeyu Zhao ◽  
...  
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
High Porosity ◽  
Two Dimensional ◽  
Metal Organic ◽  
Organic Framework

Two-dimensional (2D) conductive metal-organic frameworks (MOFs) can not only inherit the high porosity and tailorability of traditional MOFs but also exhibit unique charge transport properties, offering promising opportunities for applications...

Modulating the rate of charge transport in a metal–organic framework thin film using host:guest chemistry

2016 ◽  
Vol 52 (8) ◽  
pp. 1705-1708 ◽  
Author(s):  
Idan Hod ◽  
Omar K. Farha ◽  
Joseph T. Hupp
Keyword(s):  
Thin Film ◽  
Charge Transport ◽  
Transport Properties ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Organic Framework

Host:guest chemistry is used to control and manipulate charge transport properties of metal–organic framework (MOF) thin film.

Dramatic Improvement of Stability by In-Situ Linker Cyclization of a Metal-Organic Framework

2018 ◽  
Author(s):  
Yun-Long Hou ◽  
Mu-Qing Li ◽  
Shengxian Cheng ◽  
Yingxue Diao ◽  
Filipe Vilela ◽  
...  
Keyword(s):  
Charge Transport ◽  
Metal Organic Framework ◽  
Dramatic Improvement ◽  
Electron Systems ◽  
Crystalline Order ◽  
Polycyclic Aromatic ◽  
Metal Organic ◽  
Crystalline Metal ◽  
Organic Framework

We employ a two-step strategy for accessing crystalline porous covalent networks of highly conjugated π-electron systems. For this, we first assembled a crystalline metal-organic framework (MOF) precursor based on Zr(IV) ions and a linear dicarboxyl linker molecule featuring backfolded, highly unsaturated alkyne backbones; massive thermocyclization of the organic linkers was then triggered to install highly conjugated, fused-aromatic bridges throughout the MOF scaffold while preserving the crystalline order. The formation of cyclized carbon links not only greatly strengthen the precursor coordination scaffold, but more importantly, enhance electroactivity and charge transport throughout the polycyclic aromatic grid.

Metal–organic framework derived carbon-confined Ni2P nanocrystals supported on graphene for an efficient oxygen evolution reaction

2017 ◽  
Vol 53 (59) ◽  
pp. 8372-8375 ◽  
Author(s):  
Manman Wang ◽  
Mengting Lin ◽  
Jiantao Li ◽  
Lei Huang ◽  
Zechao Zhuang ◽  
...  
Keyword(s):  
Charge Transport ◽  
Surface Area ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
Metal Organic Framework ◽  
Effective Surface Area ◽  
Effective Surface ◽  
Metal Organic ◽  
Organic Framework

Metal–organic framework derived carbon-confined Ni2P nanocrystals supported on graphene with high effective surface area, more exposed active sites, and enhanced charge transport were successfully designed.

Polyoxometalate adsorbed in a metal–organic framework for electrocatalytic dopamine oxidation

2020 ◽  
Vol 56 (79) ◽  
pp. 11763-11766
Author(s):  
Wei Huan Ho ◽  
Tsung-Yi Chen ◽  
Ken-ichi Otake ◽  
Yu-Chuan Chen ◽  
Yi-Sen Wang ◽  
...  
Keyword(s):  
Charge Transport ◽  
Electrocatalytic Activity ◽  
Metal Organic Framework ◽  
Dopamine Oxidation ◽  
Redox Active ◽  
Metal Organic ◽  
Organic Framework

A redox-active polyoxometalate, V10O28, was immobilized into a water-stable zirconium-based metal–organic framework, NU-902. The V10O28@NU-902 can show redox hopping-based charge transport and electrocatalytic activity for dopamine sensing.

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