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Related Concept Videos

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.
Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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A spin-frustrated cobalt(II) carbonate pyrochlore network.

Yanzhen Zheng1, Arkady Ellern, Paul Kögerler

  • 1Institute of Inorganic Chemistry, RWTH Aachen University, Aachen, Germany.

Acta Crystallographica. Section C, Crystal Structure Communications
|November 5, 2011
PubMed
Summary

This study reveals the crystal structure of cobalt(II) dicarbonate trisodium chloride, a compound featuring a 3D network of tetrahedral building blocks. This structure exhibits antiferromagnetic coupling and geometric spin frustration characteristic of pyrochlore networks.

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Crystallography

Background:

  • Cobalt carbonate compounds are of interest for their magnetic properties.
  • Pyrochlore lattices are known for exhibiting unique magnetic behaviors like spin frustration.
  • Understanding the crystal structure is key to predicting and controlling material properties.

Purpose of the Study:

  • To determine the crystal structure of cobalt(II) dicarbonate trisodium chloride (Co(CO3)2Na3Cl).
  • To investigate the magnetic properties arising from the specific atomic arrangement.
  • To analyze the role of carbonate ligands in mediating magnetic interactions.

Main Methods:

  • Single-crystal X-ray diffraction was used to elucidate the crystal structure.
  • The synthesis was performed from a water-ethanol mixture.
  • Magnetic properties were inferred from the structural analysis, particularly the arrangement of cobalt ions.

Main Results:

  • The crystal structure features a 3D network of corner-sharing {Co4(μ3-CO3)4} tetrahedral building blocks.
  • Cobalt(II) centers form a pyrochlore lattice within a distorted octahedral environment.
  • Antiferromagnetic coupling between cobalt(II) centers, mediated by carbonate bridges, leads to geometric spin frustration.

Conclusions:

  • The synthesized compound Co(CO3)2Na3Cl possesses a pyrochlore-like structure with significant geometric spin frustration.
  • The carbonate ligands play a crucial role in mediating the observed magnetic interactions.
  • This structural and magnetic characterization provides insights into the design of novel magnetic materials.