Abstract
Single crystals of β1 and polycrystals of β2 of POP and SOS were obtained from acetonitrile solution. The crystallization behavior of the two polymorphs was almost the same in POP and SOS; rapid cooling of the solution preferentially crystallized the metastable β2 form, and the most stable β1 form crystallized in a very low solute concentration at the expense of β2, via solution-mediated transformation. The single crystal of β2 revealed needle-like irregular shape, whereas well-defined slender rhombic shape was observed in β1. The solubilities of the β1 forms of POP and SOS in tetradecane solution were precisely measured in a temperature range of 10∼20°C. This study showed that the solvent crystallization was the single way to grow the β1 crystal, since melt-cooling and melt-mediated transformation did not crystallize β1 both in POP and SOS.
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Arishima, T., Sato, K. Polymorphism of POP and SOS III. Solvent crystallization of β2 and β1 polymorphs. J Am Oil Chem Soc 66, 1614–1617 (1989). https://doi.org/10.1007/BF02636187
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DOI: https://doi.org/10.1007/BF02636187