Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 53: Issue 1
Polymorphic Transitions in Crystalline E- and Z-α-Phenylcinnamic acids followed by DSC
Authors:
I. Pálinkó József Attila University Department of Organic Chemistry Dóm tér 8 Szeged H-6720 Hungary Dóm tér 8 Szeged H-6720 Hungary

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T. Katona MOL Hungarian Gas and Oil Company P.O. Box 37 Szeged H-6701 Hungary P.O. Box 37 Szeged H-6701 Hungary

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L. Trowbridge University of Sussex School of Chemistry and Molecular Sciences Falmer, Brighton BN1 9QJ United Kingdom Falmer, Brighton BN1 9QJ United Kingdom

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Pages:
317–322
Online Publication Date:
03 Nov 2004
Publication Date:
01 May 1998
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010169116321
Keywords:
α-phenylcinnamic acid; DSC; polymorphic transitions; stereoisomers
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Abstract  

Polymorphic transitions of α-phenylcinnamic acid stereoisomers crystallized from various solvents (CHCl3, ethanol, diethyl ether), precipitated with different acids (acetic acid or HCl) or sublimed have been studied by differential scanning calorimetry (DSC). Measurements were also supplemented by powder X-ray diffractometry (XRD). Polymorphic transitions were not found for any of the E isomer samples irrespective of the method of treatment. However, in heating-cooling cycles reversible transitions could be detected for the Z isomer. On heating an exothermic peak was registered on samples sublimed, crystallized from ethanol or diethyl ether before melting, while samples precipitated by HCl or crystallized from chloroform exhibited more complex transitions. Here, endothermic effects were also observed. Enthalpy values for transformations (either for melting or polymorphic and other transitions) are also given.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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