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Polymorphism of POP and SOS III. Solvent crystallization of β 2 and β 1 polymorphs
Author(s) -
Arishima T.,
Sato K.
Publication year - 1989
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02636187
Subject(s) - crystallization , metastability , polymorphism (computer science) , solvent , acetonitrile , crystallography , materials science , single crystal , crystal growth , crystal (programming language) , thermodynamics , chemistry , chromatography , organic chemistry , physics , biochemistry , gene , genotype , computer science , programming language
Single crystals of β 1 and polycrystals of β 2 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 β 2 form, and the most stable β 1 form crystallized in a very low solute concentration at the expense of β 2 , via solution‐mediated transformation. The single crystal of β 2 revealed needle‐like irregular shape, whereas well‐defined slender rhombic shape was observed in β 1 . The solubilities of the β 1 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 β 1 crystal, since melt‐cooling and melt‐mediated transformation did not crystallize β 1 both in POP and SOS.