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Related Concept Videos

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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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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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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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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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Updated: Apr 25, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
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Magnetically stabilized Fe8(μ4-S)6S8 clusters in Ba6Fe25S27.

Timothy E Stacey1, Christopher K H Borg, Peter J Zavalij

  • 1Department of Physics, University of Maryland, College Park, MD 20742, USA.

Dalton Transactions (Cambridge, England : 2003)
|August 21, 2014
PubMed
Summary

We synthesized Ba6Fe25S27, revealing unique magnetic properties and electronic structure. Its antiferromagnetic transition and non-Curie-like susceptibility mimic iron-based superconductors, offering insights into bonding and stability.

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Magnetism

Background:

  • The study of novel magnetic materials is crucial for technological advancements.
  • Understanding structure-property relationships in transition metal sulfides is an active research area.

Purpose of the Study:

  • To synthesize and characterize the novel compound Ba6Fe25S27.
  • To investigate its magnetic properties and electronic structure.
  • To elucidate the bonding and stability of related phases using computational methods.

Main Methods:

  • Single crystal X-ray diffraction for structural determination.
  • SQUID magnetometry for magnetic property measurements.
  • Density Functional Theory (DFT) and molecular orbital calculations for electronic structure analysis.

Main Results:

  • Ba6Fe25S27 was successfully synthesized, exhibiting a cubic phase (Pm3[combining macron]m).
  • Antiferromagnetic ordering was observed at 25 K with anomalous high-temperature magnetic susceptibility.
  • Computational analysis provided insights into bonding, stability, and the influence of antiferromagnetism on electronic structure.

Conclusions:

  • The magnetic behavior of Ba6Fe25S27 resembles that of parent phases in iron-based superconductors.
  • The addition of Ba enhances the local stability of transition metal coordination environments.
  • This work connects magnetic structure to bonding in novel sulfide materials.