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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Metallic Solids02:37

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Multi-shelled Hollow Metal-Organic Frameworks.

Wenxian Liu1, Jijiang Huang1, Qiu Yang1

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P.R. China.

Angewandte Chemie (International Ed. in English)
|March 24, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed multi-shelled hollow metal-organic frameworks (MOFs) with single-crystalline shells. These advanced MOFs exhibit enhanced catalytic activity for styrene oxidation, paving the way for new material designs.

Keywords:
heterogeneous catalysishollow structuresmetal-organic frameworksnanocrystalsnanostructures

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Hollow metal-organic frameworks (MOFs) offer unique structural advantages, including multi-shelled architectures.
  • These sophisticated structures can enhance MOF properties and introduce novel functionalities.

Purpose of the Study:

  • To develop a rational strategy for fabricating multi-shelled hollow chromium (III) terephthalate MOFs (MIL-101) with single-crystalline shells.
  • To investigate the role of inhomogeneous crystal growth and selective etching in creating these structures.
  • To tailor the cavity size and shell thickness for optimized performance.

Main Methods:

  • Step-by-step crystal growth of chromium (III) terephthalate MOFs.
  • Selective etching of less robust inner MOF layers using acetic acid.
  • Controlled regulation of MOF nucleation and crystallization processes.

Main Results:

  • Successful fabrication of multi-shelled hollow MIL-101 with single-crystalline shells.
  • Demonstrated ability to precisely control cavity size and shell thickness.
  • Significantly enhanced catalytic activity in styrene oxidation reactions.

Conclusions:

  • The developed strategy provides a pathway for rational design of multi-shelled hollow MOFs.
  • The findings will advance the synthesis and application of advanced MOF materials.
  • Enhanced catalytic performance highlights the potential of these tailored structures.