Electrons as Anions

@article{Dye2003ElectronsAA,
  title={Electrons as Anions},
  author={James L. Dye},
  journal={Science},
  year={2003},
  volume={301},
  pages={607 - 608}
}
  • J. L. Dye
  • Published 1 August 2003
  • Physics
  • Science
In most materials, electrons are either associated with specific atoms or molecules, or are delocalized as in a metal. In his Perspective, Dye discusses recent insights into materials in which electrons behave very differently: They take the place of negatively charged ions. Most of these so-called electrides are only stable at very low temperatures. Matsuishi et al . report a new inorganic electride that is stable at room temperature. Materials of this kind may find application in… 
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References

SHOWING 1-10 OF 14 REFERENCES
Electrides: Ionic Salts with Electrons as the Anions
Electrides are ionic compounds that have alkali metal cations complexed by a crown ether or cryptand, with trapped electrons as counterions. The crystal structures and properties of two electrides
Structure of intercalated Cs in zeolite ITQ-4: an array of metal ions and correlated electrons confined in a pseudo-1D nanoporous host.
TLDR
The presence of Cs+ ions in the pseudo-1D nanopores of zeolite ITQ-4, Si32O64, is confirmed by x-ray diffraction and atomic pair distribution function analysis, providing charge balance for a low-density electron gas also confined to the nanopores.
High-Density Electron Anions in a Nanoporous Single Crystal: [Ca24Al28O64]4+(4e-)
We removed ∼100% of clathrated oxygen ions from the crystallographic cages in a single crystal of 12CaO·7Al2O3, leading to the formation of high-density (∼2 × 1021 cm–3) electrons highly localized in
Inorganic electrides formed by alkali metal addition to pure silica zeolites
Up to 4 Cs or Rb atoms per 32 Si atoms can be incorporated into the channels of the all-silica (SiO2) zeolites ITQ-4 and beta with effective oxidation states of zero. The optical properties and 29Si
Toward inorganic electrides.
TLDR
The first synthesis of thermally stable inorganic electrides with cation-to-electron ratios of 1:1 as in organic electrides is reported here, which is able to reduce small aromatic molecules such as benzene and naphthalene to the radical anions within the pores of the zeolite.
Electrides: From 1D Heisenberg Chains to 2D Pseudo-Metals†
Electrides are ionic compounds in which the cations are complexed by cryptands or crown ethers and the “anions” are trapped electrons. The crystal structures of five electrides are known and are
Inorganic electride: theoretical study on structural and electronic properties.
TLDR
Self-consistent ab initio calculations of structural and electronic properties for a kind of recently synthesized inorganic electride find that a finite density of states appears at the Fermi level, which predicts a metallic behavior of this material.
Sodium (Na43+) clusters in sodium sodalite
We have measured and calculated the absorption spectrum of the Na{sub 4}{sup 3+} clusters in Na{sub 3}[AlSiO{sub 4}]{sub 3} sodalite prepared by high-vacuum deposition of sodium atoms. The samples
Molecular recognition : receptors for cationic guests
Podands (G.W. Gokel, O. Murillo). Crown ethers (J.S. Bradshaw, R.M. Izatt A.V. Bordunov, C.Y. Zhu, J.K. Hathaway). Lariat ethers (G.W. Gokel, O.F. Schall). Cryptands (B. Dietrich). Spherands: hosts
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