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On the crystal structures and hydrogen bond patterns in proline pseudopolymorphs

Published online by Cambridge University Press:  29 February 2012

Luis E. Seijas ,
Gerzon E. Delgado ,
Asiloé J. Mora ,
Andrew N. Fitch  and
Michela Brunelli
Luis E. Seijas
Affiliation:
Laboratorio de Cristalografía, Departamento de Química, Facultad de Ciencias, Universidad de Los Andes, Mérida 5101, Venezuela
Gerzon E. Delgado*
Affiliation:
Laboratorio de Cristalografía, Departamento de Química, Facultad de Ciencias, Universidad de Los Andes, Mérida 5101, Venezuela
Asiloé J. Mora*
Affiliation:
Laboratorio de Cristalografía, Departamento de Química, Facultad de Ciencias, Universidad de Los Andes, Mérida 5101, Venezuela
Andrew N. Fitch
Affiliation:
European Synchrotron Radiation Facility, BP220, F-38043 Grenoble Cedex, France
Michela Brunelli
Affiliation:
Institut Laue Langevin, BP156, F-38042 Grenoble Cedex, France
*
a)Authors to whom correspondence should be addressed. Electronic addresses: gerzon@ula.ve and asiloe@ula.ve
a)Authors to whom correspondence should be addressed. Electronic addresses: gerzon@ula.ve and asiloe@ula.ve
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Abstract

Amino acids often cocrystallize with water molecules, which make them pseudopolymorphs of their anhydrous forms. In this work, we discuss in detail the hydrogen bond patterns in anhydrous L-proline and DL-proline and its pseudopolymorphic forms: L-proline monohydrate and DL-proline monohydrate. For this propose, the crystal structure of L-proline anhydrous was determined from synchrotron X-ray powder diffraction data and refined using the Rietveld method. Special emphasis is given to the role played by the water molecule in the hydrogen bond network observed in the crystalline structures.

Keywords

hydrogen bondingprolinepseudopolymorphscrystal structureX-ray powder diffractionsynchrotron radiation

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Type
Technical Articles
Information
Powder Diffraction , Volume 25 , Issue 3 , September 2010 , pp. 235 - 240
Copyright
Copyright © Cambridge University Press 2010

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