title: Thermodynamic relationship between alpha- and beta-forms of crystalline progesterone.
abstract: Thermodynamic properties such as the latent heat of fusion, aqueous solubility, heat of solution, and interchange energy with water were determined for single crystals of progesterone in alpha- and beta-forms. The differences in the properties between the polymorphic crystals arise from a dissimilar mode of molecular packing, rather than of molecular conformation, in the unit cells, as reflected in the IR spectral and X-ray crystallographic results..
mesh_terms: D003460:Crystallization; D008968:Molecular Conformation; D011374:Progesterone; D012995:Solubility; D013816:Thermodynamics
chemical_list: D011374:Progesterone