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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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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.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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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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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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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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Related Experiment Video

Updated: Mar 24, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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La2SrCr2O7F2: A Ruddlesden-Popper Oxyfluoride Containing Octahedrally Coordinated Cr(4+) Centers.

Ronghuan Zhang1, Gareth Read1, Franz Lang2

  • 1Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford , South Parks Road, Oxford OX1 3QR, United Kingdom.

Inorganic Chemistry
|March 10, 2016
PubMed
Summary

Low-temperature fluorination of La2SrCr2O7 creates La2SrCr2O7F2, a novel material with octahedrally coordinated Cr(4+) centers. This antiferromagnetic material, with a transition below 140 K, offers a new synthesis route for such compounds.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Inorganic chemistry

Background:

  • Octahedrally coordinated Cr(4+) centers are typically synthesized under high pressure.
  • La2SrCr2O7 is an n=2 Ruddlesden-Popper phase oxide.
  • Topochemical reactions allow for structure-conserving transformations.

Purpose of the Study:

  • To synthesize a novel material containing octahedrally coordinated Cr(4+) centers at low temperatures.
  • To investigate the magnetic properties of the synthesized fluorinated compound.
  • To explore low-temperature topochemical reactions as an alternative synthesis route.

Main Methods:

  • Low-temperature topochemical fluorine insertion reaction.
  • Neutron diffraction for structural analysis.
  • Magnetization measurements and muon spin relaxation (μ(+)SR) for magnetic characterization.

Main Results:

  • Successful synthesis of La2SrCr2O7F2 via low-temperature fluorination of La2SrCr2O7.
  • The fluorinated product retains the octahedral coordination of chromium centers.
  • La2SrCr2O7F2 exhibits an antiferromagnetic transition at approximately 140 K.

Conclusions:

  • Low-temperature topochemical reactions provide an accessible route to materials with extended arrays of apex-linked Cr(4+)O6 units.
  • La2SrCr2O7F2 is a new antiferromagnetic material with potential for further study in condensed matter physics.
  • The study highlights the importance of structure-property relationships in chromium oxide and fluoride phases.