Abstract
Flutamide usually crystallizes in the orthorhombic non-centrosymmetric space group Pna21 (from I) and melts atT fus =384 K with Δfus H=30 kJ·mol−1. It may be obtained in the glassy state (T g =272 K) by quenching the melt. Although evidence of polymorphism could not be obtained by means of crystallography, DSC studies of the recrystallization process indicate that a metastable form (form II) occurs first and is transformed into the stable form at room temperature. ΔH for the transition I→II (2.52 kJ·mol−1) is close to the difference in energy (about 2 kJ·mol−1) calculated for the two possible conformers of flutamide.
Zusammenfassung
Flutamid kristallisiert in der rhombischen nicht-zentrosymmetrischen Raumgruppe Pna21 (Form I) und schmilzt beiT fus =384 K mit Δfus H=30 kJ·mol. Durch Abschrecken der Schmelze kann es im Glaszustand (T g =272 K) erhalten werden. Obwohl kristallografisch kein Beweis für Polymorfismus erhalten werden konnte, zeigen DSC-Unter-suchungen des Rekristallisationsprozesses, daß zuerst eine metastabile Form (Form II) vorkommt, die dann bei Raumtemperatur in die stabile Form übergeht. ΔH für den Übergang I→II liegt mit 2.52 kJ/mol nahe der für die beiden möglichen Konformere von Flutamid berechneten Energiedifferenz (etwa 2 kJ/mol).
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Ceolin, R., Agafonov, V., Gonthier-Vassal, A. et al. Solid-state studies on crystalline and glassy flutamide. Journal of Thermal Analysis 45, 1277–1284 (1995). https://doi.org/10.1007/BF02547422
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DOI: https://doi.org/10.1007/BF02547422