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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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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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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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Coordination Number and Geometry

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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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Related Experiment Video

Updated: Jul 16, 2025

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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M-type Gd2[Si2O7].

Ralf Jules Christian Locke1, Thomas Schleid1

  • 1Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.

Iucrdata
|September 11, 2023
PubMed
Summary
This summary is machine-generated.

Digadolinium(III) oxidodisilicate, Gd2[Si2O7], was synthesized with an M-type crystal structure. This structure features layers of oxidodisilicate units separated by gadolinium cations.

Keywords:
crystal structuregadoliniumisotypismoxidodisilicaterare-earth metal

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Crystallography

Background:

  • The synthesis of novel inorganic compounds is crucial for materials science.
  • Understanding crystal structures provides insights into material properties.
  • Gadolinium silicates are of interest due to their potential applications.

Purpose of the Study:

  • To report the synthesis and crystal structure of digadolinium(III) oxidodisilicate, Gd2[Si2O7].
  • To characterize the M-type crystal structure of the synthesized compound.
  • To compare the structure with isotypic compounds.

Main Methods:

  • Single-crystal X-ray diffraction was used to determine the crystal structure.
  • Attempts to synthesize Gd5Br3[AsO3]4 led to the formation of the title compound as a byproduct.
  • Synthesis was performed using fused silica ampoules.

Main Results:

  • Digadolinium(III) oxidodisilicate, Gd2[Si2O7], was successfully synthesized.
  • The compound crystallizes in the M-type crystal structure.
  • The structure is isotypic with M-type Eu2[Si2O7], consisting of oxidodisilicate layers and gadolinium cation bilayers.

Conclusions:

  • The M-type crystal structure of Gd2[Si2O7] has been elucidated.
  • The synthetic route provides a method for obtaining this specific gadolinium silicate.
  • Structural similarities to other M-type silicates highlight common packing motifs.