Electrons as Anions

  title={Electrons as Anions},
  author={James L. Dye},
  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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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
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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.
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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.
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