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Related Experiment Videos

Studies of polymorphism in three compounds by single crystal X-ray diffraction.

P J Cox1, J L Wardell

  • 1School of Pharmacy, The Robert Gordon University, Schoolhill, Aberdeen, UK. p.j.cox@rgu.ac.uk

International Journal of Pharmaceutics
|February 29, 2000
PubMed
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Single crystal diffraction quantitatively determines polymorphism in three compounds. Polymorphs exhibited varying molecular and crystallographic symmetry, crystal classes, and space groups, highlighting diffraction

Area of Science:

  • Crystallography
  • Materials Science
  • Solid-State Chemistry

Background:

  • Polymorphism, the ability of a solid material to exist in multiple crystal forms, significantly impacts material properties.
  • Accurate characterization of polymorphs is crucial for controlling material behavior in various applications.
  • Single crystal diffraction is a powerful technique for elucidating crystal structures and understanding polymorphism.

Purpose of the Study:

  • To demonstrate the utility of single crystal diffraction for the quantitative determination of polymorphism.
  • To investigate the polymorphic behavior of bis(2-nitrophenyl) trisulphide (1), 2-amino-5-nitrobenzophenone (2), and bis(2-nitrophenyl) sulphide (3).

Main Methods:

  • Single crystal X-ray diffraction was employed to analyze the crystal structures of identified polymorphs.

Related Experiment Videos

  • Comparison of molecular symmetry with crystallographic symmetry was performed for each polymorph.
  • Analysis of crystal class and crystallographic space group relationships between polymorphs was conducted.

    • Main Results:

    • Two distinct polymorphs were identified for each of the three studied compounds.
    • Compound (1) showed correspondence between molecular and crystallographic symmetry in one polymorph.
    • Polymorphs of (2) belonged to the same crystal class and space group, while polymorphs of (3) differed in both.

    Conclusions:

    • Single crystal diffraction provides quantitative insights into the polymorphic landscape of organic compounds.
    • The study illustrates how polymorphs can vary in symmetry, crystal class, and space group.
    • Understanding crystallographic space group transformations is essential for characterizing complex polymorphic systems.