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Related Concept Videos

Electrical Conductivity01:13

Electrical Conductivity

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In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
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Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Finite Element Modelling of a Cellular Electric Microenvironment
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Dimensionality Modulates Electrical Conductivity in Compositionally Constant One-, Two-, and Three-Dimensional

Tianyang Chen1, Jin-Hu Dou1, Luming Yang1

  • 1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society
|March 15, 2022
PubMed
Summary
This summary is machine-generated.

Researchers created novel nickel-based metal-organic frameworks and conjugated coordination polymers with varying structures. These materials exhibit a wide range of electrical conductivity, demonstrating the impact of dimensionality on electronic properties.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) and conjugated coordination polymers (CCPs) are versatile materials with tunable electronic properties.
  • The relationship between structural dimensionality and electronic conductivity in these materials is an active area of research.

Purpose of the Study:

  • To construct Ni-based MOFs and CCPs with diverse structural dimensionalities (1D, 2D, and 3D).
  • To investigate how structural differences influence the electronic properties of these materials.
  • To explore the potential of these materials in electronic applications.

Main Methods:

  • Synthesis of Ni-based MOFs and CCPs using 2,3,5,6-tetraamino-1,4-hydroquinone (TAHQ) and its oxidized forms.
  • Characterization of the structural dimensionalities (1D, 2D, 3D) and supramolecular interactions.
  • Measurement of electrical conductivity across a wide range of samples.

Main Results:

  • Successfully synthesized Ni-1D, Ni-2D, and Ni-3D materials with identical metal-ligand composition but distinct structures.
  • Observed a significant variation in electronic properties, with electrical conductivity spanning nearly 8 orders of magnitude.
  • Achieved a maximum conductivity of approximately 0.3 S/cm in one of the synthesized materials.

Conclusions:

  • Structural dimensionality and supramolecular interactions critically influence the electronic conductivity of Ni-based MOFs and CCPs.
  • The ability to tune conductivity through structural design opens avenues for developing advanced electronic materials.
  • These findings provide valuable insights into structure-property relationships in coordination polymers.