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Structure and stability of two polymorphs of creatine and its monohydrate

Arlin, J.-B., Bhardwaj, R. M., Johnston, A., Miller, G. J., Bardin, J., MacDougall, F., Fernandes, P., Shankland, K., David, W. I. F. and Florence, A. J. (2014) Structure and stability of two polymorphs of creatine and its monohydrate. Crystengcomm, 16 (35). pp. 8197-8204. ISSN 1466-8033

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To link to this item DOI: 10.1039/c4ce00508b


An experimental search for crystalline forms of creatine including a variable temperature X-ray powder diffraction study has produced three polymorphs and a formic acid solvate. The crystal structures of creatine forms I and II were determined from X-ray powder diffraction data plus the creatine formic acid (1 : 1) solvate structure was obtained by single crystal X-ray diffraction methods. Evidence of a third polymorphic form of creatine obtained by rapid desolvation of creatine monohydrate is also presented. The results highlight the role of automated parallel crystallisation, slurry experiments and VT-XRPD as powerful techniques for effective physical form screening. They also highlight the importance of various complementary analytical techniques in structural characterisation and in achieving better understanding of the relationship between various solid-state forms. The structural relationships between various solid-state forms of creatine using the XPac method provided a rationale for the different relative stabilities of forms I and II of creatine with respect to the monohydrate form.

Item Type:Article
Divisions:Life Sciences > School of Chemistry, Food and Pharmacy > School of Pharmacy > Pharmaceutics Research Group
ID Code:39201
Additional Information:Times Cited: 1
Publisher:Royal Society of Chemistry


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