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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...
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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

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1D-3D Coordination Polymers Based on M4Cu4‑Phenylsilsesquioxane (M = K, Rb, Cs) Cages: Synthesis, Structure, and

Grigorii S Astakhov1, Alexander V Bachinskiy2, Victor N Khrustalev2,3

  • 1Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China.

ACS Omega
|May 18, 2026
PubMed
Summary

Large alkaline metal ions facilitate the creation of novel cage-like coppersilsesquioxanes. These structures show potential as precatalysts in the selective oxidation of cyclohexane to ε-caprolactone.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Coppersilsesquioxanes are cage-like structures with potential applications in catalysis.
  • Developing extended structures of these compounds is challenging.

Purpose of the Study:

  • To develop a convenient approach for creating extended structures of cage-like coppersilsesquioxanes.
  • To explore the catalytic activity of these novel compounds.

Main Methods:

  • Synthesis of Cu4-based phenylsilsesquioxane cages using alkaline metal ions (K, Rb, Cs) as supramolecular facilitators.
  • Single-crystal X-ray diffraction analysis (SCXRD) to determine structural features.
  • Assessment of compound 1 as a precatalyst in the tandem oxidation of cyclohexane.

Main Results:

  • A family of nine Cu4-based phenylsilsesquioxane cages with identical molecular architecture was synthesized.
  • SCXRD revealed the formation of 1D, 2D, and 3D coordination polymers through alkaline metal-involved interactions.
  • Compound 1 demonstrated potential as a selective precatalyst, yielding up to 31.8% of ε-caprolactone from cyclohexane oxidation.

Conclusions:

  • Large alkaline metal ions effectively act as supramolecular facilitators for constructing extended coppersilsesquioxane structures.
  • The synthesized coordination polymers exhibit promising catalytic activity for the selective oxidation of cyclohexane.
  • These findings highlight the potential of coppersilsesquioxanes in developing efficient catalytic processes for valuable industrial monomers.