Polymorphic phase transmformation in the 3-bromo-trans-cinnamic acid system

Shinbyoung Ahn, Kenneth Harris, Benson Kariuki, DMS Zin

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

3-Bromo-trans-cinnamic acid (3-BrCA) exists as two crystalline polymorphic forms (designated as beta and gamma phases). A polymorphic phase transformation from the gamma phase to the beta phase has been investigated using ex situ powder X-ray diffraction, in situ high-temperature optical microscopy, and differential scanning calorimetry. The transformation occurs at an observable rate at temperatures above about 100 degreesC. A reverse transformation on subsequently cooling the beta phase is not observed. Thermodynamic aspects of the polymorphic 3-BrCA system are discussed, together with kinetic aspects of the transformation from the gamma phase to the beta phase. The structural properties of the beta phase (reported previously) and the gamma phase (determined in this work from single-crystal X-ray diffraction data) are in accord with the alpha/beta/gamma structural classification of trans-cinnamic acid derivatives. (C) 2000 Academic Press.
Original languageEnglish
Pages (from-to)10-15
Number of pages6
JournalJournal of Solid State Chemistry
Volume156
Issue number1
DOIs
Publication statusPublished - 1 Jan 2001

Fingerprint

Dive into the research topics of 'Polymorphic phase transmformation in the 3-bromo-trans-cinnamic acid system'. Together they form a unique fingerprint.

Cite this