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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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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.
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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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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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Three-Dimensional Metal-Fullerene Frameworks.

Andreas Kraft1, Patrick Roth1, David Schmidt1

  • 1Institut für Organische Chemie and, Center for Nanosystems Chemistry (CNC), Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 11, 2016
PubMed
Summary
This summary is machine-generated.

Novel fullerene linkers with high symmetry enable the creation of new, inversely cross-linked coordination polymers and metal-organic frameworks. These unique building blocks offer precise spatial arrangement for advanced material synthesis.

Keywords:
X-ray diffractionfullereneshexakis adductsmetal-organic frameworkszinc

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Hexakis-substituted [60]fullerene adducts offer precise spatial arrangement of twelve functional groups due to icosahedral symmetry.
  • Polyfunctional organic building blocks with high geometric precision are valuable for synthesizing coordination polymers and metal-organic frameworks.
  • Existing frameworks often have metal ions as the primary connectivity centers.

Purpose of the Study:

  • To explore the use of hexakis-substituted fullerene adducts as highly connective linkers in framework synthesis.
  • To create novel fullerene-containing three-dimensional frameworks with inversely cross-linked structures.
  • To investigate the coordination behavior of fullerene derivatives with metal ions.

Main Methods:

  • Synthesis of two hexakis adducts of [60]fullerene with twelve glycolic acid or 3-hydroxypropionic acid side chains.
  • Incorporation of these fullerene adducts as organic connectivity centers.
  • Coordination with Zn(2+) ions to form three-dimensional frameworks.

Main Results:

  • Successful synthesis of the first fullerene-containing three-dimensional frameworks.
  • Demonstration of fullerene-based linkers exhibiting higher connectivity than metal ions.
  • Creation of a new type of inversely cross-linked framework where the ligand dictates connectivity.

Conclusions:

  • Hexakis-substituted [60]fullerene adducts are effective organic connectivity centers for constructing advanced frameworks.
  • The unique symmetry and high connectivity of these fullerene linkers enable the formation of novel inversely cross-linked materials.
  • This approach opens new avenues for designing complex, highly porous materials with potential applications in various fields.