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2,4,6-Trichlorophenylisonitrile and 2,4,6-trichlorobenzonitrile

Pink1, Britton, Noland

  • 1Department of Chemistry, University of Minnesota, Minneapolis, MN 55455-0431, USA.

Acta Crystallographica. Section C, Crystal Structure Communications
|October 12, 2000
PubMed
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Structural analysis of 2,4,6-trichlorophenylisonitrile and 2,4,6-trichlorobenzonitrile reveals similar 2D molecular layers. Different stacking modes prevent overall isomorphism, despite shared intermolecular interactions.

Area of Science:

  • Crystallography
  • Molecular Structure Analysis
  • Supramolecular Chemistry

Background:

  • Understanding the precise arrangement of atoms in organic molecules is crucial for predicting their physical and chemical properties.
  • Investigating halogenated aromatic compounds provides insights into intermolecular forces and crystal packing.
  • Comparing nitrile and isonitrile functional groups within similar molecular frameworks can reveal subtle structural differences.

Purpose of the Study:

  • To determine and compare the crystal structures of 2,4,6-trichlorophenylisonitrile and 2,4,6-trichlorobenzonitrile.
  • To analyze the intermolecular interactions, specifically halogen bonding, present in both structures.
  • To investigate the degree of structural similarity and identify reasons for any differences in crystal packing.

Main Methods:

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  • Single-crystal X-ray diffraction was employed to elucidate the three-dimensional molecular structures.
  • Analysis of bond lengths, bond angles, and intermolecular contacts.
  • Comparison of crystal packing motifs and symmetry elements.

Main Results:

  • Both 2,4,6-trichlorophenylisonitrile and 2,4,6-trichlorobenzonitrile exhibit normal molecular structures.
  • Similar two-dimensional layers are formed in both compounds, stabilized by Cl···CN and Cl···NC interactions.
  • The crystal structures are not isomorphous due to distinct layer-stacking arrangements.

Conclusions:

  • Despite the presence of similar 2D layers and intermolecular interactions, the overall crystal structures of the title compounds differ.
  • The observed differences in layer stacking highlight the sensitivity of crystal packing to subtle molecular variations and intermolecular forces.
  • This study contributes to the understanding of structure-property relationships in halogenated aromatic compounds.