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Two-dimensional packing and pseudosymmetry.

D Britton1

  • 1Department of Chemistry, University of Minnesota, Minneapolis, MN 55455-0431, USA. britton@chemsun.chem.umn.edu

Acta Crystallographica. Section B, Structural Science
|September 28, 2000
PubMed
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Crystal pseudosymmetry arises from higher 2D layer symmetry obscured by 3D packing. This study rationalizes pseudosymmetry in six diverse crystal examples, revealing underlying structural principles.

Area of Science:

  • Crystallography
  • Materials Science
  • Solid-State Chemistry

Background:

  • Pseudosymmetry in crystals often presents a challenge in structural determination.
  • Understanding the origin of pseudosymmetry can provide insights into crystal packing and growth.

Purpose of the Study:

  • To rationalize the occurrence of pseudosymmetry elements in crystalline materials.
  • To demonstrate how two-dimensional (2D) layer symmetry can be obscured by three-dimensional (3D) packing.
  • To provide examples illustrating this phenomenon.

Main Methods:

  • Analysis of crystal structures exhibiting pseudosymmetry.
  • Comparison of 2D layer symmetry with observed 3D crystal symmetry.
  • Examination of six distinct crystalline examples, including simple compounds and co-crystals.

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Main Results:

  • Identified six examples where pseudosymmetry is a direct consequence of underlying 2D layer symmetry.
  • Demonstrated that the 3D packing arrangement effectively obscures the higher symmetry of the 2D layers.
  • Observed pseudosymmetry across six different crystallographic symmetries.

Conclusions:

  • Pseudosymmetry in crystals can be systematically understood as a result of layer-to-layer stacking interactions.
  • The described principle offers a framework for interpreting complex crystal structures.
  • This rationalization aids in predicting and understanding crystal behavior based on layer structure.