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Related Concept Videos

Coordination Number and Geometry02:57

Coordination Number and Geometry

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.
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...
MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

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...
Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
Colors and Magnetism03:02

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.

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Related Experiment Video

Updated: Jun 1, 2026

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area
08:13

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Published on: February 19, 2018

β-Nd(2)Mo(4)O(15).

Dan Zhao1, Fei-Fei Li, Yu-Ming Yao

  • 1Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, Henan 454000, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|May 19, 2011
PubMed
Summary
This summary is machine-generated.

Dineodymium(III) tetra-molybdate(VI) was synthesized as a new crystal structure. This second polymorph, Nd(2)Mo(4)O(15), exhibits a unique 3D network of polyhedra.

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Crystallography

Background:

  • Rare earth metal molybdates are compounds with diverse structural and functional properties.
  • Understanding polymorphs is crucial for controlling material characteristics.
  • Previous studies have characterized cerium and praseodymium analogs.

Purpose of the Study:

  • To synthesize and characterize a new polymorph of dineodymium(III) tetra-molybdate(VI).
  • To elucidate the crystal structure of the title compound.
  • To compare its structure with related rare earth molybdates.

Main Methods:

  • Flux technique for material synthesis.
  • Single-crystal X-ray diffraction for structural determination.
  • Polyhedral analysis to describe the network.

Main Results:

  • The second polymorph of dineodymium(III) tetra-molybdate(VI), Nd(2)Mo(4)O(15), was successfully prepared.
  • The crystal structure is isotypic with Ce(2)Mo(4)O(15) and Pr(2)Mo(4)O(15).
  • A 3D network comprising distorted NdO(7) and NdO(8) polyhedra, and MoO(4) and MoO(6) coordination units was identified.

Conclusions:

  • The synthesis and structural characterization of a new dineodymium(III) tetra-molybdate(VI) polymorph were achieved.
  • The structural similarity to cerium and praseodymium analogs highlights trends in rare earth molybdate structures.
  • The complex polyhedral network provides insights into the bonding and stability of these inorganic materials.