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… 
Electrides and Their High-Pressure Chemistry
Recently, electrides were discovered in many systems (especially those containing alkali and alkali earth metals) at high pressures . An electride can be defined as an ionic compound where the role
Spin-paired solvated electron couples in alkali-ammonia systems.
DFT and ab initio computations have been used to show that spin-paired couples of electrons can overcome Coulomb repulsion, occupying a cavity formed by solvent molecules, comparable in size to that of single solvated electrons.
Theoretical Descriptors of Electrides.
Eight common theoretical descriptors of electrides are surveyed for their efficacy in identifying these materials and density-based descriptors such as the electron localization function (ELF) and localized-orbital locator (LOL) are shown to be the most consistently reliable.
Electrides: a review
Electrides are systems in which an electron is not bound to an atom and plays an active role in the materials structure. We present concise summaries of the different types of electride in the
Photoinduced generation of electron anions in H-doped nanoporous oxide 12CaO∙7Al2O3: Toward an optically controlled formation of electrides
We suggest, on the basis of detailed ab initio calculations of both ground and photoexcited states of H-doped 12CaO∙7Al2O3 (C12A7:H), that stable high-conductivity regions can be optically generated
How Many Electrons Holds a Molecular Electride?
Electrides are very peculiar ionic compounds where electrons occupy the anionic positions. In a crystal lattice, these isolated electrons often group forming channels or surfaces, furnishing
Creating interfaces by stretching the solvent is key to metallic ammonia solutions.
Ab initio simulations show that they are not preferentially localized close to the void centers but accumulate at the void/solvent interface, and void formation itself can be reproduced by simply "stretching" pure ammonia, without any unbound electrons.
Electron anions and the glass transition temperature
It is shown that electron anions modify the disordered glass network by creating highly mobile weak links, thus fundamentally altering the thermodynamic and electronic properties of the network and enabling a new design paradigm for amorphous materials.
How Many Electrons Does a Molecular Electride Hold?
This paper analyzes the non-nuclear attractor (NNA) and the surrounding region of nine molecular electrides to determine the number of isolated electrons held in the electride and classified them according to the most likely number of electrons that the NNA can find.


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.
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.
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.
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.
Inorganic electride: theoretical study on structural and electronic properties.
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