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Gauss's Law: Planar Symmetry01:27

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A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
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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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Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
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Planar hexacoordinate gallium.

Meng-Hui Wang1, Chen Chen1, Sudip Pan2,3

  • 1Institute of Atomic and Molecular Physics, Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University Changchun China zcui@jlu.edu.cn.

Chemical Science
|December 15, 2021
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Summary
This summary is machine-generated.

The first planar hexacoordinate gallium (phGa) center was discovered in the GaBe6Au6+ cluster. This star-like cluster exhibits double aromaticity, providing significant electronic and kinetic stability.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Inorganic Chemistry

Background:

  • Exploring novel cluster structures and bonding is crucial for advancing materials science.
  • Understanding the stability of low-coordinate main group elements in clusters presents a significant challenge.

Purpose of the Study:

  • To report the discovery and characterization of the first planar hexacoordinate gallium (phGa) center.
  • To investigate the electronic and kinetic stability of the GaBe6Au6+ cluster.

Main Methods:

  • Theoretical calculations to determine the global minimum structure and electronic state (1A1g) of the GaBe6Au6+ cluster.
  • Born-Oppenheimer molecular dynamics simulations to assess kinetic stability.
  • Energy decomposition analysis and natural orbitals for chemical valence (NOCV) theory to elucidate bonding characteristics.

Main Results:

  • Identification of a unique star-like D6h structure for the GaBe6Au6+ cluster featuring a central phGa atom.
  • Demonstration of double aromaticity (both sigma and pi) contributing to the electronic stability of the planar cluster.
  • High kinetic stability confirmed through molecular dynamics simulations.

Conclusions:

  • The GaBe6Au6+ cluster represents a novel structural motif with a planar hexacoordinate gallium center.
  • The observed stability is attributed to a combination of double aromaticity and specific bonding interactions, including electron-sharing pi bonds and sigma-backdonation/donation.