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Twisted aspirin crystals.

Xiaoyan Cui1, Andrew L Rohl, Alexander Shtukenberg

  • 1Department of Chemistry, New York University, 100 Washington Square East, Silver Center, Room 1001, New York, New York 10003, United States.

Journal of the American Chemical Society
|February 22, 2013
PubMed
Summary
This summary is machine-generated.

Crystallizing aspirin with salicylic acid creates unique banded spherulites. These structures exhibit helicoidal crystallites with both linear and circular birefringence, driven by molecular strain.

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Area of Science:

  • Materials Science
  • Crystallography
  • Polymer Science

Background:

  • Spherulites are common crystalline structures in polymers and organic materials.
  • Understanding the formation and properties of aspirin-salicylic acid systems is crucial for pharmaceutical applications.

Purpose of the Study:

  • To investigate the crystallization of aspirin in the presence of salicylic acid.
  • To characterize the structural and optical properties of the resulting banded spherulites.

Main Methods:

  • Melt crystallization of aspirin with varying salicylic acid concentrations.
  • Analysis using scanning electron microscopy (SEM), X-ray diffraction (XRD), and optical polarimetry.
  • Mueller matrix imaging for detailed optical property assessment.

Main Results:

  • Banded spherulites composed of helicoidal crystallites along the <010> growth direction were observed.
  • Radial oscillations in both linear and circular birefringence were detected.
  • A slight, systematic splaying of lamellae was identified as the cause of optical phenomena.

Conclusions:

  • The twisting of crystallites is attributed to molecular strain from salicylic acid incorporation.
  • The observed optical properties are directly linked to the crystallite morphology and composition.
  • This study provides insights into structure-property relationships in organic crystalline materials.