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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Metallic Solids02:37

Metallic Solids

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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
Valence Bond Theory02:42

Valence Bond Theory

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...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
08:49

Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films

Published on: December 4, 2014

Infinite-layer iron oxide with a square-planar coordination.

Y Tsujimoto1, C Tassel, N Hayashi

  • 1Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan.

Nature
|December 14, 2007
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel iron oxide, SrFeO2, with a unique square-planar coordination for iron atoms. This new material exhibits high-temperature magnetism and potential applications in catalysis and gas absorption.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Inorganic Chemistry

Background:

  • Conventional synthesis methods for transition-metal oxides are limited by high temperatures, restricting control over coordination geometries.
  • Iron atoms in oxides typically adopt 3D polyhedra like tetrahedra or octahedra.
  • Low-temperature synthesis using reducing agents like metal hydrides offers access to novel structures.

Purpose of the Study:

  • To synthesize a new transition-metal oxide with unprecedented coordination geometry.
  • To investigate the structural, magnetic, and chemical properties of the synthesized compound.
  • To explore the potential applications of the new material.

Main Methods:

  • Reaction of perovskite SrFeO3 with calcium hydride (CaH2) at low temperatures.
  • Structural characterization of the resulting compound, SrFeO2.
  • Magnetic property measurements.
  • Investigation of redox reactions with SrFeO3 via a brownmillerite intermediate (SrFeO2.5).

Main Results:

  • Successful synthesis of SrFeO2, featuring square-planar oxygen coordination around Fe2+ ions.
  • SrFeO2 is isostructural with 'infinite layer' cupric oxides.
  • The material exhibits magnetic ordering well above room temperature, attributed to strong in-layer magnetic interactions from Fe d-O p hybridization.
  • SrFeO2 demonstrates stability at low temperatures despite the expected orbital degeneracy.
  • Redox reactions between SrFeO2 and SrFeO3 occur around 400 K via SrFeO2.5.

Conclusions:

  • Low-temperature synthesis using metal hydrides enables the creation of transition-metal oxides with unusual coordination geometries.
  • SrFeO2 is a stable, novel material with significant potential for applications in oxygen ion conduction, gas absorption, and catalysis.
  • The study highlights the importance of exploring low-temperature synthesis routes for discovering new functional materials.