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Related Concept Videos

Molecular Shapes01:18

Molecular Shapes

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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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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Isolation and Structures of Polyarene Palladium Nanoclusters.

Ayaka Hatano1, Tsuyoshi Sugawa1, Rei Mimura1

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|June 5, 2023
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Researchers synthesized novel organotransition metal nanoclusters using arene ligands. They discovered unique palladium cores (Pd13 and Pd17) with direct metal-metal bonding, advancing nanocluster structural understanding.

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Area of Science:

  • Organometallic Chemistry
  • Nanomaterials Science
  • Coordination Chemistry

Background:

  • Organotransition metal nanoclusters are crucial in catalysis and materials science.
  • Controlling nanocluster structure and composition remains a significant challenge.

Purpose of the Study:

  • To synthesize and characterize novel organotransition metal nanoclusters using arene ligands.
  • To investigate the structural diversity and bonding modes within these nanoclusters.

Main Methods:

  • Synthesis of palladium nanoclusters using [2.2]paracyclophane as a ligand.
  • Structural characterization via X-ray crystallography and other spectroscopic techniques.
  • Theoretical analysis to explain observed core structures.

Main Results:

  • Isolation of two distinct polyarene palladium nanoclusters with Pd13 and Pd17 cores.
  • Discovery of direct palladium-palladium bonding within the nanocluster cores.
  • Identification of a novel μ4-facial coordination mode for arene ligands.

Conclusions:

  • Neutral six-membered arene rings can effectively coordinate to form well-defined organotransition metal nanoclusters.
  • The synthesized nanoclusters exhibit unique core structures and bonding not previously observed.
  • Stereochemical and theoretical analyses provide insights into the formation of these novel structures.