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Bonding in Metals02:32

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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 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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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).
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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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Controlled polymerizations using metal-organic frameworks.

Shuto Mochizuki1, Takashi Kitao2, Takashi Uemura3

  • 1Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.

Chemical Communications (Cambridge, England)
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Summary
This summary is machine-generated.

Recent advances in polymerization reactions utilize metal-organic frameworks (MOFs). These tunable, porous materials offer precise control over polymer structures, from primary to higher-order arrangements.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are crystalline porous materials with tunable structures.
  • MOFs offer unique environments for chemical reactions due to their high surface area and porosity.

Purpose of the Study:

  • To review recent developments in polymerization reactions facilitated by MOFs.
  • To highlight the role of MOF structure in controlling polymerization outcomes.

Main Methods:

  • Review of literature on MOF-templated polymerization.
  • Analysis of structure-property relationships in MOF-mediated synthesis.

Main Results:

  • MOFs enable precise control over polymer primary and higher-order structures.
  • Tunable MOF frameworks act as effective media for controlled polymerization.

Conclusions:

  • MOF design is crucial for regulating polymerization processes.
  • MOFs represent a promising platform for advanced polymer synthesis.