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Simulation of diffuse scattering in DL-norleucine.

Thomas Richard Welberry1, Carl Henrik Görbitz2

  • 1Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|August 25, 2020
PubMed
Summary
This summary is machine-generated.

Diffuse scattering in DL-norleucine (DL-Nle) crystals reveals insights into crystal disorder. Monte Carlo simulations link this scattering to molecular bilayer slipping during phase transitions, enhancing understanding of mixed phases.

Keywords:
Monte Carlo simulationdiffuse scatteringdl-norleucinemolecular bilayersracemates

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Area of Science:

  • Crystallography
  • Materials Science
  • Chemical Physics

Background:

  • DL-norleucine (DL-Nle) crystals exhibit diffuse scattering, or 'streaking', between Bragg peaks.
  • This phenomenon is typically attributed to stacking disorder in weakly interacting 2D layers, common in racemates and quasi-racemates.

Purpose of the Study:

  • To investigate and extract information from diffuse scattering patterns in DL-Nle crystals.
  • To model diffuse scattering and relate it to phase transition mechanisms.

Main Methods:

  • Application of Monte Carlo simulations to analyze site distributions.
  • Simulation of large crystal blocks (48x48x48 unit cells) with detailed site occupancy.

Main Results:

  • Successfully modeled diffuse scattering patterns in DL-Nle.
  • Established a link between diffuse scattering and molecular bilayer slipping during phase transitions.
  • Demonstrated the possibility of quantifying domain size and defect density in intermediate mixed phases.

Conclusions:

  • Diffuse scattering provides valuable information about crystal behavior and phase transitions.
  • Monte Carlo simulations offer a powerful tool for analyzing complex crystallographic phenomena.
  • This study advances the understanding of mixed phases in crystalline materials.