Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 90: Issue 2
Influence of high energy milling on the kinetics of the polymorphic transition from the monoclinic form to the orthorhombic form of (±)5-methyl-5-(4’-methylphenyl)hydantoin
Authors:
J. Linol SMS, UPRES EA3233-IRCOF, Université de Rouen Unité de Croissance Cristalline et de Modélisation Moléculaire 76821 Mont Saint Aignan Cedex France

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G. Coquerel SMS, UPRES EA3233-IRCOF, Université de Rouen Unité de Croissance Cristalline et de Modélisation Moléculaire 76821 Mont Saint Aignan Cedex France

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Pages:
367–370
Online Publication Date:
07 Dec 2007
Publication Date:
01 Nov 2007
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-007-8395-y
Keywords:
high energy milling; polymorphism; transition kinetics
Restricted access

Abstract  

5-methyl-5-(4’-methylphenyl) hydantoin is a chiral compound whose racemic mixture crystallizes as a conglomerate. This molecule has two polymorphs: an orthorhombic form (stable form) and a monoclinic form of monotropic character. These forms share extensive structural analogies (identical 2D periodic fragment) and consistently their lattice energies are quite close. The analyses of the crystal structures lead to propose an irreversible polymorphic transition based on a destructive/reconstructive mechanism. Under comparable conditions (mass of solid, temperature, etc.) the conversion is completed within 14 days by means of slurring in ethanol (10 days if seeded) whereas 5 h only are necessary by means of mechanical activation under wet conditions and 9 h under dry milling. In the latter conditions the resulting materials appears significantly more defective in comparisons to the other modes of conversion.

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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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