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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

19.5K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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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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Coordination Number and Geometry02:57

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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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,...
43.3K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.9K
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...
26.9K

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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A Significant Two-Dimensional Structural Transformation in a Coordination Polymer that Changes Its Electronic and

Yao Jing1, Yukihiro Yoshida1, Tokutaro Komatsu2

  • 1Division of Chemistry, Graduate School of Science, Kyoto University Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502, Japan.

Angewandte Chemie (International Ed. in English)
|May 12, 2023
PubMed
Summary

Researchers demonstrated a novel 2D-to-2D structural transformation in copper(II) coordination polymers. This process enhances magnetic susceptibility and proton conductivity in the material.

Keywords:
2D-to-2D TransformationCoordination PolymerMagnetismProton Conductivity

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Crystallography

Background:

  • Coordination polymers (CPs) are advanced materials with tunable structures.
  • Transformations in CPs can alter their properties.
  • Understanding structural changes is key to designing functional materials.

Purpose of the Study:

  • To demonstrate a 2D-to-2D structural transformation in a copper(II) coordination polymer.
  • To investigate the accompanying bond rearrangement and coordination environment changes.
  • To explore the impact of this transformation on material properties.

Main Methods:

  • Synthesis of a 2D copper(II) coordination polymer membrane (Cu-1).
  • Immersion of the membrane in water to induce structural transformation to Cu-2.
  • Characterization of structural changes using in situ experiments.
  • Theoretical calculations to understand the transformation mechanism.

Main Results:

  • A novel 2D-to-2D structural transformation was achieved in a copper(II)-terephthalate coordination polymer (Cu-1 to Cu-2).
  • The transformation involved significant bond rearrangement and changes in coordination environment, releasing Cu(II) dimers into aqua-bridged chains.
  • The transformed material exhibited increased in-plane magnetic susceptibility and proton conductivity.
  • An energy diagram governing the transformation was elucidated.

Conclusions:

  • A facile method for 2D-to-2D structural transformation in CPs was developed.
  • This transformation significantly enhances key material properties like magnetism and conductivity.
  • The findings provide insights into CP structural dynamics and potential applications.