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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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COP Coated Vesicles

Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of different...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Color in Coordination Complexes
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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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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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Graphitically encapsulated cobalt nanocrystal assemblies.

Shu-Hua Liu1, Haitao Gao, Enyi Ye

  • 1Institute of Materials Research and Engineering, A-STAR, Singapore 117602.

Chemical Communications (Cambridge, England)
|May 27, 2010
PubMed
Summary
This summary is machine-generated.

Chemically synthesized graphitic encapsulated cobalt nanocrystal assemblies reveal self-assembling properties through a reversed etching process, creating a porous graphitic structure.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Cobalt nanocrystals are crucial in various applications.
  • Controlling nanocrystal assembly is challenging.
  • Encapsulation can enhance material properties.

Purpose of the Study:

  • To develop a method for synthesizing graphitically encapsulated cobalt nanocrystal assemblies.
  • To investigate the self-assembling nature of these nanocrystals.
  • To create a porous graphitic structure for enhanced properties.

Main Methods:

  • One-pot chemical synthesis at temperatures exceeding 380°C.
  • Reversed etching process to create porosity.
  • Characterization of the resulting graphitic structure and nanocrystal assemblies.

Main Results:

  • Successfully synthesized graphitically encapsulated cobalt nanocrystal assemblies.
  • The reversed etching process yielded a porous graphitic structure.
  • The study revealed the self-assembling behavior of the cobalt nanocrystals.

Conclusions:

  • The described method enables the controlled synthesis of encapsulated nanocrystal assemblies.
  • The porous structure facilitates the observation of self-assembly.
  • This approach offers potential for advanced nanomaterial design.