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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...
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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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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
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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.
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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

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Trigonal bipyramidal magnetic molecules based on [Mo(III)(CN)(6)](3-).

Xin-Yi Wang1, Matthew G Hilfiger, Andrey Prosvirin

  • 1Department of Chemistry, Texas A&M University, College Station, Texas 77840, USA.

Chemical Communications (Cambridge, England)
|May 14, 2010
PubMed
Summary

New trigonal bipyramidal molecules containing cobalt or nickel and molybdenum cyanide units were synthesized. These molecules exhibit ferromagnetic interactions, suggesting potential applications in materials science.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetism

Background:

  • The study focuses on novel coordination compounds with potential magnetic properties.
  • Molybdenum cyanide complexes are of interest for their unique electronic structures.

Purpose of the Study:

  • To synthesize and characterize new trigonal bipyramidal molecules.
  • To investigate the magnetic interactions within these novel compounds.

Main Methods:

  • Synthesis of trigonal bipyramidal molecules [M(tmphen)(2)](3)[Mo(CN)(6)](2).(solvent) where M = Co, Ni.
  • Preparation involved the loss of a cyanide ligand from [Mo(III)(CN)(7)](4-).

Main Results:

  • The synthesized molecules contain the [Mo(III)(CN)(6)](3-) unit.
  • Ferromagnetic interactions were observed between the M(II) (Cobalt or Nickel) and Mo(III) centers.

Conclusions:

  • The successful synthesis of these novel compounds provides new platforms for studying magnetic interactions.
  • The observed ferromagnetic behavior highlights the potential of these materials in developing advanced magnetic systems.