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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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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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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: Exploring Self-Assembled MOF-Polymer Composites
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Inside polyMOFs: layered structures in polymer-based metal-organic frameworks.

Kyle C Bentz1, Karthikeyan Gnanasekaran2, Jake B Bailey1

  • 1Department of Chemistry and Biochemistry, University of California San Diego La Jolla California 92093-0358 USA scohen@ucsd.edu.

Chemical Science
|June 14, 2021
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Summary
This summary is machine-generated.

Polymer metal-organic frameworks (polyMOFs) exhibit self-assembled nanostructures. These polyMOFs show alternating metal-rich and metal-deficient regions, regardless of polymer block arrangement.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Polymer metal-organic frameworks (polyMOFs) are hybrid materials combining polymer and metal-organic framework properties.
  • Understanding their internal nanostructure is crucial for designing advanced functional materials.

Purpose of the Study:

  • To investigate the internal structural features of polyMOFs composed of metal-coordinating and non-coordinating polymer blocks.
  • To elucidate the self-assembly mechanisms governing the nanostructure of polyMOFs.

Main Methods:

  • Transmission electron microscopy (TEM)
  • Scanning electron microscopy (SEM)
  • Energy-dispersive X-ray spectroscopy (EDS)
  • Small-angle synchrotron X-ray scattering (SAXS)

Main Results:

  • PolyMOFs display alternating lamellar structures of metal-rich crystalline regions and metal-deficient non-crystalline polymer domains.
  • These lamellar structures span hundreds of nanometers and exhibit single-nanometer scale self-assembly.
  • Similar structural alternation was observed across different copolymer architectures (random blocks, end-blocks) and non-coordinating polymers (poly(ethylene glycol), poly(cyclooctadiene)).

Conclusions:

  • A universal self-assembly mechanism drives the formation of lamellar nanostructures in polyMOFs.
  • The observed self-assembly is independent of copolymer architecture and composition.
  • These findings provide fundamental insights into the structure-property relationships of polyMOFs.