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Related Concept Videos

MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

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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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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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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.
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Construct Polyoxometalate Frameworks through Covalent Bonds.

Hong Chen1,2, Huishuang Zhao1,3, Zheng-Bao Yu4

  • 1Berzelii Centre EXSELENT on Porous Materials, Department of Materials and Environmental Chemistry, Stockholm University , SE-106 91 Stockholm, Sweden.

Inorganic Chemistry
|August 20, 2015
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Summary
This summary is machine-generated.

Researchers developed covalently bonded polyoxometalate frameworks (CPOMs) using polymer chemistry principles. This breakthrough enables the construction of 3D open-framework materials with enhanced stability and novel properties.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Inorganic Chemistry

Background:

  • Polyoxometalates (POMs) are assembled into open-framework materials using organic linkers.
  • Existing polyoxometalate metal-organic frameworks (POMMOFs) utilize only coordination bonds.
  • There is a need for covalently bonded polyoxometalate frameworks for improved material properties.

Purpose of the Study:

  • To introduce the concept of covalently bonded POMs (CPOMs).
  • To demonstrate the synthesis of 3D CPOMs using polymer chemistry principles.
  • To explore novel open-framework materials based on covalent POM structures.

Main Methods:

  • Utilized vanadoborates as a model system for CPOM synthesis.
  • Employed a condensation reaction via the oxolation mechanism.
  • Characterized the resulting crystalline materials using single-crystal X-ray diffraction.

Main Results:

  • Successfully synthesized 3D covalently bonded polyoxometalate frameworks (CPOMs).
  • Demonstrated the feasibility of constructing crystalline CPOMs through covalent bonding.
  • Established a link between polymer science and POM chemistry for open-framework design.

Conclusions:

  • Covalent bonding, inspired by polymer chemistry, can be used to construct robust 3D open-framework POM materials.
  • This approach expands the design principles for advanced POM-based materials.
  • The development of CPOMs opens new avenues for POM applications in materials science.