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Polymorphic Phase Transformation in the 3-Bromo-trans-cinnamic Acid System

✍ Scribed by Shinbyoung Ahn; Kenneth D.M. Harris; Benson M. Kariuki; Dimple M.S. Zin

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
173 KB
Volume
156
Category
Article
ISSN
0022-4596

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✦ Synopsis

exists as two crystalline polymorphic forms (designated as and phases). A polymorphic phase transformation from the phase to the phase has been investigated using ex situ powder X-ray di4raction, in situ high-temperature optical microscopy, and di4erential scanning calorimetry. The transformation occurs at an observable rate at temperatures above about 1003C. A reverse transformation on subsequently cooling the phase is not observed. Thermodynamic aspects of the polymorphic 3-BrCA system are discussed, together with kinetic aspects of the transformation from the phase to the phase. The structural properties of the phase (reported previously) and the phase (determined in this work from single-crystal X-ray di4raction data) are in accord with the / / structural classi5cation of trans-cinnamic acid derivatives.

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