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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

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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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Spin–Spin Coupling: One-Bond Coupling01:17

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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,...
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Colors and Magnetism03:02

Colors and Magnetism

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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...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.1K
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.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Exploring Spin-Phonon Coupling in Magnetic 2D Metal-Organic Frameworks.

Diego López-Alcalá1, Alberto M Ruiz1, José J Baldoví1

  • 1Instituto de Ciencia Molecular, Universitat de València, 46980 Paterna, Spain.

Nanomaterials (Basel, Switzerland)
|April 13, 2023
PubMed
Summary

Layered magnetic metal-organic frameworks (MOFs) show promise for 2D magnetism. First-principles calculations explore exfoliation and properties of VCl2(pyz)2 and CrCl2(pyz)2, revealing low spin-phonon coupling.

Keywords:
2D magnetismcoordination chemistryfirst principlesmetal-organic frameworksspin-phonon coupling

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Chemistry

Background:

  • Layered magnetic metal-organic frameworks (MOFs) integrate MOF advantages with 2D magnetic crystals.
  • Recent discovery of high-temperature magnetism (515 K) in MCl2(pyz)2 MOFs offers a platform for 2D high-Tc magnetism.
  • M represents transition metals, and pyz is pyrazine.

Purpose of the Study:

  • Investigate exfoliation feasibility of VCl2(pyz)2 and CrCl2(pyz)2 down to monolayer.
  • Explore structural, electronic, magnetic, and vibrational properties of these 2D MOFs.
  • Analyze spin-phonon coupling (SPC) and effects of halide substitution.

Main Methods:

  • First-principles calculations were employed.
  • Structural, electronic, magnetic, and vibrational properties were explored.
  • Spin-phonon coupling (SPC) was analyzed in detail.

Main Results:

  • Calculations indicate feasibility of exfoliating VCl2(pyz)2 and CrCl2(pyz)2 to monolayer.
  • Low spin-phonon coupling (SPC) was observed in the 2D derivatives.
  • Thermal evolution of magnetic exchange interactions and anisotropy are primarily influenced by low-frequency phonon modes.

Conclusions:

  • The study provides chemical insights for enhancing performance of 2D magnetic MOFs.
  • Effective manipulation of phonon modes can significantly impact magnetic properties.
  • These findings pave the way for designing advanced 2D magnetic materials.