Single crystals of aspirin form II: crystallisation and stability

Andrew D. Bond (*,a), Katarzyna A. Solanko (a), Simon Parsons (b), Sascha Redder (c) and Roland Boese (c)

(a) Department of Physics and Chemistry, University of Southern Denmark, 5230 Odense M, Denmark.
(b) School of Chemistry and Centre for Science at Extreme Conditions, The University of Edinburgh
(c) Institut für Anorganische Chemie, Universität Duisburg-Essen, Universitätstrasse 5, 45117 Essen, Germany

CrystEngComm, 2011, 13, 399–401

[DOI: 10.1039/c0ce00588f]


Single crystals of aspirin form II can be obtained by crystallization of aspirin in the presence of aspirin anhydride in organic solvents such as acetonitrile or tetrahydrofuran. The crystals are stable under ambient conditions for months and do not show any phase transition on application of isotropic pressure up to 2.2 GPa.


Electronic supplementary information (ESI) available:
PXRD patterns for bulk samples produced by crystallisation of aspirin in the presence of aspirin anhydride in THF and MeCN, simulated PXRD patterns for aspirin anhydride and aspirin forms I and II, unit-cell parameters for aspirin form II at pressure up to 2.2 GPa.

Zweite polymorphe Form von Ibuprophen entdeckt.  

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