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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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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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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...
11.4K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.5K
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,...
1.5K
Diamagnetism01:26

Diamagnetism

3.1K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
3.1K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.8K
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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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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A Ferroelectric Iron(II) Spin Crossover Material.

Verónica Jornet-Mollá1, Yan Duan1, Carlos Giménez-Saiz1

  • 1Instituto de Ciencia Molecular, Universitat de València, P. O. Box 22085, 46071, Valencia, Spain.

Angewandte Chemie (International Ed. in English)
|September 8, 2017
PubMed
Summary

Researchers developed a novel dual-function material where ferroelectricity and spin crossover occur together. This material, [Fe(bpp)2](isonic)2·2H2O, exhibits unique properties upon dehydration, transitioning to a ferroelectric phase with spin crossover capabilities.

Keywords:
ferroelectricshydrogen bondsiron(II) complexessolvent exchangespin crossover

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Area of Science:

  • Materials Science
  • Crystallography
  • Chemistry

Background:

  • Coexistence of ferroelectricity and spin crossover in a single material is rare.
  • Designing materials with predictable acentric structures is challenging.
  • Hydrogen bonds offer a route to control crystal structure and properties.

Purpose of the Study:

  • To synthesize a dual-function material exhibiting both ferroelectricity and spin crossover.
  • To investigate the structural and property changes upon dehydration.
  • To demonstrate a predictable synthetic strategy for acentric materials.

Main Methods:

  • Utilized a synthetic strategy based on hydrogen bonding interactions.
  • Combined the iron(II) spin crossover complex [Fe(bpp)2]2+ with the isonicotinate anion.
  • Characterized the material's structure and properties using X-ray diffraction and other techniques.
  • Investigated single-crystal to single-crystal dehydration-induced transformation.

Main Results:

  • Successfully synthesized [Fe(bpp)2](isonic)2·2H2O, which crystallizes in an acentric nonpolar space group.
  • The dehydrated form exhibits ferroelectricity and spin crossover in the same temperature range.
  • Demonstrated a single-crystal to single-crystal transformation upon dehydration, leading to a polar ferroelectric phase.

Conclusions:

  • A novel dual-function material with coexisting ferroelectricity and spin crossover has been achieved.
  • The synthetic strategy based on hydrogen bonds enables predictable construction of acentric structures.
  • The material's ability to undergo a structural rearrangement to a ferroelectric phase highlights its potential for advanced applications.