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Molecular motions in supercooled and glassy ibuprofen: deuteron magnetic resonance and high-resolution rheology study

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Zimmermann,  Herbert
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Bauer, S., Storek, M., Gainaru, C., Zimmermann, H., & Böhmer, R. (2015). Molecular motions in supercooled and glassy ibuprofen: deuteron magnetic resonance and high-resolution rheology study. Journal of Physical Chemistry B, 19(15), 5087-5095. doi:10.1021/acs.jpcb.5b01072.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0026-AD8B-C
Abstract
Using deuteron nuclear magnetic resonance, the molecular motions of specifically isotope-labeled ibuprofen were probed at the carboxylic group and at the methin group next to it. Spin relaxometry revealed slight differences between the molecular motions of the two isotopomers that are rationalized with reference to the hydrogen bonding of the COOH moiety. In the glassy state, a small-angle jump process among about four sites, related to the so-called γ-process, was identified using stimulated-echo spectroscopy. Indications for a Debye-like process, previously found to leave a weak signature in the dielectric loss, could not unambiguously be detected in magnetic resonance or shear mechanical experiments carried out for supercooled liquid ibuprofen