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Disorder in pentachloronitrobenzene, C(6)Cl(5)NO(2): a diffuse scattering study.

Lynne H Thomas1, T Richard Welberry, Darren J Goossens

  • 1University Chemical Laboratory, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, England.

Acta Crystallographica. Section B, Structural Science
|July 21, 2007
PubMed
Summary
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Monte Carlo simulations reveal that pentachloronitrobenzene molecules in crystals exhibit large local relaxations. These relaxations significantly increase distances between nitro groups and chlorine atoms, impacting crystal structure.

Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Computational materials science

Background:

  • Understanding molecular arrangements and interactions in crystals is crucial for predicting material properties.
  • Diffuse X-ray scattering provides insights into local atomic displacements and disorder beyond the average crystal structure.

Purpose of the Study:

  • To interpret and model single-crystal diffuse X-ray scattering data for pentachloronitrobenzene (C6Cl5NO2).
  • To investigate the nature and extent of local atomic relaxations in the crystal structure.

Main Methods:

  • Utilized Monte Carlo computer simulations to model the observed diffuse X-ray scattering patterns.
  • Assumed random occupancy of molecules in one of six orientations at each crystal site.
  • Analyzed the impact of local relaxation displacements on interatomic distances.

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Main Results:

  • The distinctive diffraction patterns were explained by random molecular orientations and significant local relaxation displacements.
  • Increased distances were observed for NO(2)...NO(2) and NO(2)...Cl contacts.
  • A corresponding reduction in Cl...Cl contact distances was noted.
  • The mean NO(2)...NO(2) distance increased by approximately 0.6 Angstrom compared to the average structure.

Conclusions:

  • Local relaxation displacements play a dominant role in shaping the diffuse X-ray scattering of pentachloronitrobenzene.
  • The study highlights the importance of considering dynamic relaxations beyond average structures for accurate crystallographic interpretation.
  • These findings contribute to a deeper understanding of intermolecular interactions and their influence on crystal packing.