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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.
Ferromagnetism01:31

Ferromagnetism

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...
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 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: Three-Bond Coupling (Vicinal Coupling)01:22

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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.
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A spin crossover ferrous complex with ordered magnetic ferric anions.

Olivier Roubeau1, Marco Evangelisti, Eva Natividad

  • 1Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Departamento de Física de la Materia Condensada, Pl. San Francisco s/n, 50009 Zaragoza, Spain. roubeau@unizar.es

Chemical Communications (Cambridge, England)
|June 28, 2012
PubMed
Summary

The first tetrahaloferrate spin crossover compound, [Fe(Metz)(6)](FeBr4)2, was synthesized. This material exhibits both ferromagnetism and gradual spin crossover, offering new possibilities for magnetic and electronic devices.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Magnetism

Background:

  • Spin crossover (SCO) compounds are of interest for molecular switches and memory devices.
  • Tetrahaloferrate complexes offer unique magnetic properties.
  • Integrating SCO with other magnetic phenomena is a key challenge.

Purpose of the Study:

  • To report the synthesis and characterization of the first tetrahaloferrate spin crossover compound.
  • To investigate the magnetic properties and spin crossover behavior of the new compound.
  • To explore the coexistence of different magnetic ordering phenomena.

Main Methods:

  • Single-crystal X-ray diffraction for structural determination.
  • Magnetic susceptibility measurements to probe magnetic ordering and spin crossover.
  • Temperature-dependent studies to observe phase transitions.

Main Results:

  • The synthesis of [Fe(Metz)(6)](FeBr4)2, the first tetrahaloferrate SCO compound, is confirmed.
  • The FeBr4- ions form 1D ferromagnetically coupled stacks.
  • Antiferromagnetic order was observed at 2.2 K, coexisting with gradual spin crossover centered at 165 K.

Conclusions:

  • This study presents a novel SCO material with coexisting magnetic phenomena.
  • The compound demonstrates potential for advanced electronic and magnetic applications.
  • Further research can explore tuning SCO and magnetic properties through structural modification.