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DSC and adiabatic calorimetry study of the polymorphs of paracetamol

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Abstract

Monoclinic (I) and orthorhombic (II) polymorphs of paracetamol were studied by DSC and adiabatic calorimetry in the temperature range 5 - 450 K. At all the stages of the study, the samples (single crystals and powders) were characterized using X-ray diffraction. A single crystal → polycrystal II→ I transformation was observed on heating polymorph II, after which polymorph I melted at 442 K. The previously reported fact that the two polymorphs melt at different temperatures could not be confirmed. The temperature of the II→I transformation varied from crystal to crystal. On cooling the crystals of paracetamol II from ambient temperature to 5 K, a II→ I transformation was also observed, if the 'cooling-heating' cycles were repeated several times. Inclusions of solvent (water) into the starting crystals were shown to be important for this transformation. The values of the low-temperature heat-capacity of the I and II polymorphs of paracetamol were compared, and the thermodynamic functions calculated for the two polymorphs.

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Boldyreva, E.V., Drebushchak, V.A., Paukov, I.E. et al. DSC and adiabatic calorimetry study of the polymorphs of paracetamol. Journal of Thermal Analysis and Calorimetry 77, 607–623 (2004). https://doi.org/10.1023/B:JTAN.0000038998.47606.27

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  • DOI: https://doi.org/10.1023/B:JTAN.0000038998.47606.27

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