Polymorphism in propyl gallate recrystallized with acetone

A new polymorphic form of the synthetic antioxidant propyl gallate was obtained by the recrystallization of the compound in acetone. The new form was characterized by thermogravimetry, differential scanning calorimetry, X-ray powder diffractometry, and near- and middle-infrared region spectroscopy....

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2017-04, Vol.128 (1), p.611-614
Main Authors: Gálico, D. A., Nova, C. V., Bannach, G.
Format: Article
Language:English
Subjects:
Acetone
Analytical Chemistry
Antioxidants (Nutrients)
Calorimetry
Chemistry
Chemistry and Materials Science
Infrared spectroscopy
Inorganic Chemistry
Measurement Science and Instrumentation
Physical Chemistry
Polymer Sciences
Polymorphism
Recrystallization
Thermogravimetry
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Summary:A new polymorphic form of the synthetic antioxidant propyl gallate was obtained by the recrystallization of the compound in acetone. The new form was characterized by thermogravimetry, differential scanning calorimetry, X-ray powder diffractometry, and near- and middle-infrared region spectroscopy. While the commercial form of propyl gallate starts to melt at 145 °C with the maximum temperature of the peak at 150 °C, the recrystallized form starts to melt at 140 °C with the maximum temperature of the peak at 148.8 °C. The two forms differ much in the X-ray powder diffractograms pattern, confirming the change in the long-distance interactions in both forms but the near- and middle-infrared region spectroscopy shows that no difference occurs in the inter- and intramolecular interactions.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-016-5927-3