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On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature
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Direct observation of a transient polymorph during crystallization.

Colan E Hughes1, Kenneth D M Harris

  • 1School of Chemistry, Cardiff University, Park Place, Cardiff, Wales, CF10 3AT, UK.

Chemical Communications (Cambridge, England)
|May 29, 2010
PubMed
Summary

Glycine crystallization in methanol/water solutions initially forms the beta polymorph. This transient beta form then transforms into the more stable alpha polymorph via a solution-mediated process.

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Area of Science:

  • Solid-state chemistry
  • Crystallization science
  • Materials science

Background:

  • Polymorphism is crucial in materials science, affecting physical properties.
  • Understanding crystallization pathways is key to controlling polymorph formation.
  • Glycine exhibits multiple polymorphs, with alpha and beta being well-known.

Purpose of the Study:

  • To investigate the in situ crystallization process of glycine in a methanol/water solution.
  • To provide direct evidence for the transient formation of polymorphs during crystallization.
  • To elucidate the mechanism of polymorphic transformation.

Main Methods:

  • Utilized in situ solid-state Carbon-13 Nuclear Magnetic Resonance ((13)C NMR) spectroscopy.
  • Applied a specialized NMR technique for real-time monitoring of crystallization.
  • Analyzed spectral changes to identify intermediate species and transformations.

Main Results:

  • Direct evidence for the transient formation of the beta-glycine polymorph during crystallization was observed.
  • The beta polymorph was found to be an intermediate, not the final product.
  • A solution-mediated transformation from the beta to the alpha polymorph was confirmed.

Conclusions:

  • The crystallization of glycine from methanol/water is a multi-step process.
  • The beta polymorph serves as a transient intermediate in the formation of the stable alpha polymorph.
  • In situ (13)C NMR is a powerful tool for studying dynamic crystallization processes and polymorphic transformations.