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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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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.
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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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Tetrahedral Complexes
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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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Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Observation of Iso-Symmetric Structural and Lifshitz Transitions in Quasi-One-Dimensional CrNbSe<sub>5</sub>.

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Long Range Magnetic Order in 6H Hexagonal Perovskites Containing Chromium and Rhenium.

Cierra J Foster1, Jie Xiong1, Matt Boswell2

  • 1Department of Chemistry and Biochemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210, United States.

Inorganic Chemistry
|July 9, 2025
PubMed
Summary
This summary is machine-generated.

Barium chromium rhenium oxides exhibit antiferromagnetic ordering due to superexchange and direct exchange interactions. Their crystal structures and magnetic properties were investigated using X-ray and neutron diffraction.

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Area of Science:

  • Solid-state chemistry and materials science.
  • Magnetism and magnetic materials research.
  • Inorganic chemistry and crystallography.

Background:

  • Barium chromium rhenium oxides are complex inorganic compounds with potential magnetic applications.
  • Understanding the interplay between crystal structure and magnetic ordering is crucial for designing new materials.

Purpose of the Study:

  • To synthesize and characterize polycrystalline samples of Ba3Cr2ReO9 and Ba2CrReO6.
  • To investigate the crystal structure, magnetic ordering, and exchange interactions in these compounds.

Main Methods:

  • Solid-state synthesis methods.
  • Laboratory X-ray powder diffraction (XRPD) for crystal structure determination.
  • Magnetometry and specific heat measurements for magnetic properties.
  • Variable temperature neutron powder diffraction (NPD) for magnetic structure refinement.

Main Results:

  • Both Ba3Cr2ReO9 and Ba2CrReO6 crystallize in the 6H hexagonal structure (P63/mmc).
  • Transition metal ions exhibit preferential site occupancy with some antisite mixing.
  • Both compounds display long-range antiferromagnetic ordering.
  • Magnetic structures are governed by Re-O-Cr superexchange and Cr-Cr/Cr-Re direct exchange interactions.

Conclusions:

  • The crystal structure and magnetic ordering in Ba3Cr2ReO9 and Ba2CrReO6 have been elucidated.
  • The magnetic properties are consistent with superexchange and direct exchange interactions.
  • Cr 3d orbital overlap is insufficient for metal-metal bond formation within the bioctahedron.