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Related Concept Videos

Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Interplay between defects, disorder and flexibility in metal-organic frameworks.

Thomas D Bennett1, Anthony K Cheetham1, Alain H Fuchs2

  • 1Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.

Nature Chemistry
|December 21, 2016
PubMed
Summary

Metal-organic frameworks (MOFs) are versatile nanoporous materials. Recent research reveals that flexibility, defects, and disorder are common in MOFs, offering new avenues for material functionality.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are a diverse class of nanoporous materials.
  • Historically, research focused on synthesizing new MOF structures.
  • Current trends emphasize exploring properties of existing MOFs.

Purpose of the Study:

  • Shift focus from MOF synthesis to understanding properties of known structures.
  • Investigate the prevalence and implications of flexibility, defects, and disorder in MOFs.
  • Explore how these characteristics, often overlooked, can enhance MOF functionalities.

Main Methods:

  • Review of recent literature on MOF properties.
  • Analysis of experimental and computational studies on MOF flexibility and defects.
  • Conceptual framework development linking MOF characteristics to functionalities.

Main Results:

  • Growing evidence suggests large-scale flexibility, defects, and disorder are inherent to MOFs, not exceptions.
  • These properties are often intertwined and significantly influence material behavior.
  • Understanding these interconnected concepts is crucial for MOF applications.

Conclusions:

  • MOF research is shifting towards understanding inherent properties like flexibility and defects.
  • These characteristics are integral to MOF behavior and can be leveraged for enhanced functionalities.
  • Further investigation into the interplay of flexibility, defects, and disorder will drive innovation in MOF applications.