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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.
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Van der Waals Interactions01:24

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.Polar molecules have a partial positive charge on one end and a partial negative charge on the other end of the molecule,...
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: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...

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Dinuclear oxovanadium(IV) thiolate complexes with ferromagnetically coupled interaction between vanadium centers.

Yi-Fang Tsai1, Gui-Shih Huang, Chen-I Yang

  • 1Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan.

Inorganic Chemistry
|November 8, 2007
PubMed
Summary

Two new dinuclear oxovanadium(IV) thiolate complexes were synthesized. These complexes exhibit intramolecular ferromagnetic interactions between their two vanadium metal centers, a significant finding in coordination chemistry.

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Vanadium complexes are known for their diverse coordination geometries and electronic properties.
  • Thiolate ligands offer unique bonding capabilities and can influence metal-metal interactions.
  • Understanding dinuclear metal complexes is crucial for developing novel magnetic materials.

Purpose of the Study:

  • To synthesize and characterize novel dinuclear oxovanadium(IV) thiolate complexes.
  • To investigate the structural geometries and electronic properties of these complexes.
  • To explore the magnetic interactions between the vanadium centers.

Main Methods:

  • Synthesis of two dinuclear oxovanadium(IV) thiolate complexes: [N(C5H11)4]2[VOL1]2 (1) and [N(C4H9)4][(VOL2)2(mu-OCH3)] (2).
  • Structural characterization of the complexes, including determination of coordination geometries.
  • Investigation of magnetic properties, specifically intramolecular interactions.

Main Results:

  • Complex 1 features an edge-sharing bi-square-pyramid geometry with a syn-orthogonal configuration.
  • Complex 2 exhibits a face-sharing bioctahedron geometry with two oxo groups in syn positions.
  • Both complexes demonstrate intramolecular ferromagnetic interaction between the two vanadium metal centers.

Conclusions:

  • The successful synthesis and characterization of these dinuclear oxovanadium(IV) thiolate complexes provide new structural insights.
  • The observed intramolecular ferromagnetic interaction highlights the potential of these complexes in magnetism.
  • These findings contribute to the understanding of metal-metal interactions in polynuclear vanadium compounds.