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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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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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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Recent advances in endohedral metallofullerenes.

Wenting Cai1, Mengmeng Zhang2, Luis Echegoyen3,4

  • 1School of Chemistry, Xi'an Jiaotong University, Xi'an 710049, China.

Fundamental Research
|April 17, 2025
PubMed
Summary

Endohedral metallofullerenes (EMFs) encapsulate metal ions within carbon cages, enabling novel electronic and catalytic properties. Recent advances in synthesis and characterization reveal unique bonding and multifunctional applications in medicine and electronics.

Keywords:
CrystallographyFullerenesMetal-metal bondingMetallofullerenesSingle-molecule magnet

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Area of Science:

  • Nanotechnology and Materials Science
  • Coordination Chemistry
  • Supramolecular Chemistry

Background:

  • Fullerenes are carbon-based polycyclic structures with emerging applications in catalysis, electronics, and energy.
  • Endohedral metallofullerenes (EMFs) are hybrid molecules formed by encapsulating metal species within fullerene cages.
  • Advancements in synthesis and separation are crucial for exploring novel EMF properties.

Purpose of the Study:

  • To highlight recent progress in the synthesis and characterization of endohedral metallofullerenes (EMFs).
  • To explore the unique structural, electronic, and physicochemical properties of novel EMFs.
  • To discuss the potential applications of EMFs in diverse scientific and technological fields.

Main Methods:

  • Advanced synthetic methodologies for fabricating metal-fullerene nanocatalysts and polymeric fullerene layers.
  • Sophisticated separation techniques to isolate and purify diverse EMFs.
  • Comprehensive characterization of EMFs, particularly those involving transition and actinide metals.

Main Results:

  • Novel EMFs exhibit distinctive properties surpassing conventional fullerenes due to diverse encapsulated metal constituents.
  • Unique phenomena such as regioselective dimerization and non-classical cage preferences have been observed.
  • EMFs demonstrate strong coordination with non-metal atoms, offering insights into bonding characteristics.

Conclusions:

  • Endohedral metallofullerenes represent a promising class of hybrid molecules with tunable properties.
  • The versatility of encapsulated species endows EMFs with multifunctional potential for biomedicine, electronics, and magnetism.
  • Further investigation into EMF electronic structures and bonding is essential for unlocking their full capabilities.