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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...
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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...
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.
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7&#8722;&#948;/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
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New layered cobalt oxyfluoride, Sr2CoO3F.

Yoshihiro Tsujimoto1, Jun J Li, Kazunari Yamaura

  • 1International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan. TSUJIMOTO.Yoshihiro@nims.go.jp

Chemical Communications (Cambridge, England)
|February 1, 2011
PubMed
Summary

Researchers synthesized the first Ruddlesden-Popper cobalt oxyfluoride, Sr(2)CoO(3)F. This new material adopts a K(2)NiF(4)-type structure under high pressure and temperature conditions.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Inorganic Chemistry

Background:

  • Layered oxyfluorides are an important class of materials with diverse electronic and magnetic properties.
  • Ruddlesden-Popper phases, characterized by their layered structure, offer tunable properties through compositional variations.
  • Cobalt-based compounds are of interest due to their potential applications in catalysis, energy storage, and magnetism.

Purpose of the Study:

  • To synthesize and characterize the first Ruddlesden-Popper type layered cobalt oxyfluoride.
  • To determine the crystal structure and coordination environment of cobalt in the new material.
  • To investigate the structural consequences of synthesizing this compound under extreme conditions.

Main Methods:

  • High-pressure synthesis at 6 GPa and 1700 °C.
  • X-ray diffraction (XRD) for crystal structure determination.
  • Analysis of coordination geometry around cobalt ions.

Main Results:

  • Successful synthesis of Sr(2)CoO(3)F, the first Ruddlesden-Popper cobalt oxyfluoride.
  • The material adopts a K(2)NiF(4)-type structure.
  • Distorted square pyramidal coordination observed for cobalt ions.
  • Evidence of oxygen/fluorine disorder at apical crystallographic sites.

Conclusions:

  • The synthesis of Sr(2)CoO(3)F expands the family of Ruddlesden-Popper layered oxyfluorides.
  • The observed structure and coordination provide insights into the behavior of cobalt in such layered frameworks.
  • High-pressure synthesis is a viable route for accessing novel layered inorganic materials.