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Related Concept Videos

Switching of BJT01:22

Switching of BJT

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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
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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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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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Alkali Metals03:06

Alkali Metals

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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
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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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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Switching in Metal-Organic Frameworks.

Fahime Bigdeli1, Christina T Lollar2, Ali Morsali1

  • 1Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, P.O. Box 14155-4838, Tehran, Iran.

Angewandte Chemie (International Ed. in English)
|May 29, 2019
PubMed
Summary
This summary is machine-generated.

Switchable metal-organic frameworks (MOFs) are smart materials with reversible structural changes triggered by external stimuli. This review explores their properties, design, and applications based on light, spin crossover, redox, temperature, and wettability.

Keywords:
adsorptionhost-guest systemsmetal-organic frameworksmolecular devicesswitchable materials

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Area of Science:

  • Materials Science
  • Chemistry

Background:

  • Metal-organic frameworks (MOFs) offer tunable porosity and structural diversity.
  • Switchable MOFs, a subset of smart materials, exhibit reversible structural changes in response to external stimuli.
  • While MOF flexibility is widely studied, switchable MOFs remain an underexplored area.

Purpose of the Study:

  • To review the properties and general design principles of switchable MOFs.
  • To categorize switching mechanisms based on external stimuli.
  • To highlight the technological potential of switchable MOFs.

Main Methods:

  • Literature review focusing on switchable MOFs.
  • Analysis of switching phenomena triggered by various stimuli.
  • Categorization of MOFs based on switching triggers.

Main Results:

  • Switchable MOFs undergo distinct, reversible structural transformations.
  • Switching can be induced by light, spin crossover (SCO), redox reactions, temperature, and wettability.
  • These materials possess significant technological applicability.

Conclusions:

  • Switchable MOFs represent a promising class of smart materials.
  • Understanding their design and switching mechanisms is crucial for future applications.
  • Further research into switchable MOFs is warranted to unlock their full potential.