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Related Concept Videos

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Crystal Field Theory
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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Color in Coordination Complexes
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Anisotropic Redox Conductivity within a Metal-Organic Framework Material.

Subhadip Goswami1, Idan Hod2, Jiaxin Dawn Duan1

  • 1Department of Chemistry , Northwestern University , 2145 Sheridan Road , Evanston 60208 , Illinois , United States.

Journal of the American Chemical Society
|October 15, 2019
PubMed
Summary

Metal-organic frameworks (MOFs) can be made electrically conductive through redox hopping in their linkers. This study demonstrates anisotropic conductivity in NU-1000 MOFs, with significantly higher conductivity along one direction.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Electrical conductivity is crucial for metal-organic frameworks (MOFs) in applications like catalysis.
  • Insulating MOFs require strategies to enable charge transport for broader functionality.
  • NU-1000 is a platform MOF with potential for conductivity enhancement.

Purpose of the Study:

  • To engineer electrical conductivity in the NU-1000 MOF.
  • To investigate the mechanism of charge transport via redox hopping.
  • To explore the anisotropic electrical conductivity of NU-1000 based on its structure.

Main Methods:

  • Reversible electrochemical oxidation of tetraphenylpyrene linkers in NU-1000.
  • Computational modeling to predict anisotropic electronic coupling and conductivity.
  • Experimental orientation of NU-1000 crystallites (interfacial solvothermal synthesis, electrophoretic deposition) to test conductivity anisotropy.

Main Results:

  • NU-1000 MOFs exhibit electrical conductivity through redox hopping of oxidized linkers.
  • Computational predictions show direction-dependent electronic coupling strength.
  • Experimental results confirm significant anisotropy, with conductivity up to ~3500 times higher along the c-direction compared to the a,b plane.

Conclusions:

  • Redox hopping provides a viable mechanism for achieving electrical conductivity in MOFs.
  • The anisotropic conductivity of NU-1000 is governed by linker electronic coupling and MOF topology.
  • Findings inform the design of conductive MOFs for electrocatalysis and other applications.