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Polymorphism in 2,4,6-trinitrotoluene crystallized from solution.

R M Vrcelj1, H G Gallagher, J N Sherwood

  • 1Contribution from the Department of Pure and Applied Chemistry and Department of Physics and Applied Physics, University of Strathclyde, Glasgow G1 1XL, Scotland, UK.

Journal of the American Chemical Society
|July 18, 2001
PubMed
Summary
This summary is machine-generated.

Solvent type influences 2,4,6-trinitrotoluene (TNT) polymorphism not by structural guidance, but by affecting solubility and supersaturation, leading to different crystal forms. This aligns with Ostwald

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Area of Science:

  • Crystallization Science
  • Materials Chemistry
  • Physical Chemistry

Background:

  • Polymorphism in 2,4,6-trinitrotoluene (TNT) is critical for its stability and properties.
  • Previous studies suggested solvent type directly dictates TNT polymorphic form.
  • Understanding solvent effects is key to controlling crystallization processes.

Purpose of the Study:

  • To investigate the role of solvent type in the polymorphic nature of 2,4,6-trinitrotoluene (TNT) precipitation.
  • To determine if solvent stereospecific guidance or solubility dictates polymorphic outcomes.
  • To establish rules for isolating metastable forms of TNT and related compounds.

Main Methods:

  • Precipitation of 2,4,6-trinitrotoluene (TNT) from various solvents.
  • Calorimetric techniques to study phase transitions.
  • In situ crystallization studies using synchrotron radiation for structural analysis.

Main Results:

  • Polymorphic variations are linked to solubility and supersaturation, not direct solvent structural guidance.
  • The metastable orthorhombic phase precipitates first, followed by conversion to the stable monoclinic form.
  • Solvent-mediated phase transformation is influenced by solubility and kinetics.

Conclusions:

  • Solvent effects on TNT polymorphism are primarily kinetic and solubility-driven, not stereospecific.
  • Results align with Ostwald's Law of Stages, explaining initial precipitation of metastable forms.
  • Formulated rules can guide the isolation of metastable polymorphic forms in related systems.