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Related Experiment Videos

Two polymorphs of N,N'-diphenethylterephthalamide.

Jerzy Ossowski1, Piotr Kuś, Christian Näther

  • 1Department of Chemistry, Silesian University, 9 Szkolna St., 40-006 Katowice, Poland.

Acta Crystallographica. Section C, Crystal Structure Communications
|July 11, 2006
PubMed
Summary

This study identifies two crystalline forms (polymorphs) of a compound. One form, observed in dimethylformamide, appears to be a rare, disappearing polymorph, while the other, from ethanol, is stable.

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Area of Science:

  • Crystallography
  • Solid-state chemistry
  • Materials science

Background:

  • Polymorphism is crucial in determining the physical and chemical properties of solid compounds.
  • Understanding crystal packing and intermolecular interactions is key to controlling solid-state behavior.
  • The title compound, C(24)H(24)N(2)O(2), was investigated for its polymorphic behavior.

Purpose of the Study:

  • To characterize the crystal structures of different polymorphs of the title compound.
  • To investigate the stability and potential interconversion of observed polymorphs.
  • To elucidate the role of intermolecular interactions in dictating crystal packing.

Main Methods:

  • Single-crystal X-ray diffraction was used to determine the crystal structures.

Related Experiment Videos

  • Powder X-ray diffraction and differential scanning calorimetry were employed to assess sample purity and thermal behavior.
  • Analysis of intermolecular interactions, including hydrogen bonding and C-H...O contacts, was performed.

    • Main Results:

    • Two polymorphs were identified: a triclinic form crystallized from dimethylformamide and a monoclinic form from ethanol.
    • Both polymorphs exhibit crystallographic inversion symmetry with molecular 'ladders' linked by N-H...O=C hydrogen bonds.
    • Structural differences were attributed to variations in weak C-H...O contacts.
    • Further investigations revealed no evidence of the triclinic form in new samples, suggesting it is a disappearing polymorph.

    Conclusions:

    • The title compound exhibits polymorphism, with distinct crystal structures arising from different crystallization solvents.
    • The monoclinic polymorph appears to be the stable form under the investigated conditions.
    • The triclinic polymorph is likely a transient or disappearing form, highlighting the importance of crystallization conditions and solvent effects on solid-state structure.