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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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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
Ionic Crystal Structures02:42

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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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Colors and Magnetism

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 eye.
Lattice Energies of Ionic Crystals01:27

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Related Experiment Video

Updated: Jun 1, 2026

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
08:43

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Published on: October 27, 2018

The lanthanum(III) molybdate(VI) La(4)Mo(7)O(27).

Benjamin van der Wolf1, Peter Held, Petra Becker

  • 1Institute of Crystallography, University of Cologne, 50674 Cologne, Germany.

Acta Crystallographica. Section E, Structure Reports Online
|May 18, 2011
PubMed
Summary

Researchers synthesized lanthanum molybdenum oxide crystals, La(4)Mo(7)O(27), revealing a unique crystal structure. This structure features interconnected polyhedra forming chains and alternating layers, offering insights into complex oxide materials.

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Inorganic Chemistry

Background:

  • Lanthanum molybdenum oxides are complex inorganic compounds with potential applications.
  • Understanding the crystal structure of these oxides is crucial for predicting their properties.
  • Previous studies have explored various compositions within the La-Mo-O system.

Purpose of the Study:

  • To synthesize and characterize a new phase of lanthanum molybdenum oxide, La(4)Mo(7)O(27).
  • To elucidate the detailed crystal structure of this ortho-rhom-bic phase.
  • To investigate the coordination environments of lanthanum and molybdenum atoms within the structure.

Main Methods:

  • Single-crystal X-ray diffraction was used to determine the crystal structure.
  • Synthesis was achieved from a non-stoichiometric melt in the pseudo-ternary La(2)O(3)-MoO(3)-B(2)O(3) system.
  • Crystallographic data were analyzed to identify atomic positions and coordination polyhedra.

Main Results:

  • The ortho-rhom-bic phase La(4)Mo(7)O(27) was successfully synthesized.
  • The crystal structure consists of [LaO(8)] and [LaO(9)] polyhedra forming chains along [010].
  • These chains alternate with layers containing [MoO(4)] and [MoO(5)] polyhedra, including [Mo(3)O(11)] units.

Conclusions:

  • The detailed crystal structure of La(4)Mo(7)O(27) has been determined.
  • The arrangement of lanthanum and molybdenum polyhedra defines the unique layered structure.
  • This work contributes to the understanding of structural diversity in lanthanum molybdenum oxides.