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Structures from powders: diflorasone diacetate.

Elisabetta Maccaroni1, Giovanni Battista Giovenzana, Giovanni Palmisano

  • 1Dipartimento di Scienze Chimiche e Ambientali, Università dell'Insubria, via Valleggio 11, I-22100 Como, Italy. emaccaroni@gmail.com

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Summary
This summary is machine-generated.

Diflorasone diacetate (DDW) transforms into new anhydrous polymorphs (DD1, DD2, DD3) upon heating. Researchers determined the distinct crystal structures of these diflorasone diacetate polymorphs using powder diffraction data.

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Pharmaceutical science

Background:

  • Diflorasone diacetate is a steroid anti-inflammatory drug used for skin disorders.
  • It exists in anhydrous (DD1) and monohydrated (DDW) forms.
  • Understanding polymorphs is crucial for drug stability and efficacy.

Purpose of the Study:

  • To investigate the polymorphic transformations of diflorasone diacetate upon heating.
  • To characterize the crystal structures of the resulting polymorphs.
  • To elucidate the relationship between different diflorasone diacetate forms.

Main Methods:

  • Heating diflorasone diacetate (DDW and DD1) to induce polymorphic transitions.
  • Laboratory powder diffraction for crystal structure determination.
  • Thermoanalytical methods (e.g., DSC, TGA) for characterization.
  • Nuclear Magnetic Resonance (NMR) spectroscopy (1H, 13C, 19F) for structural analysis.

Main Results:

  • Heating DDW above 90°C yields a mixture of DD1 and a new anhydrous polymorph, DD2.
  • Further heating of DD1 or the DD1/DD2 mixture up to 230°C generates an elusive anhydrous polymorph, DD3.
  • DDW and DD1 are isomorphous (orthorhombic), while DD2 and DD3 exhibit distinct unit cells (orthorhombic and monoclinic, respectively).
  • Lattice parameters and space groups for DD1, DD2, DDW, and DD3 were determined.

Conclusions:

  • Diflorasone diacetate exhibits complex polymorphic behavior upon thermal treatment.
  • Distinct anhydrous and hydrated forms of diflorasone diacetate possess unique crystal structures.
  • The study provides a comprehensive structural characterization of diflorasone diacetate polymorphs, essential for pharmaceutical development.