Molecular motions in supercooled and glassy ibuprofen: deuteron magnetic resonance and high-resolution rheology study.
Molecular motions in supercooled and glassy ibuprofen: deuteron magnetic resonance and high-resolution rheology study.
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过冷和玻璃状布洛芬中的分子运动:氘核磁共振和高分辨率流变学研究
DOI:
10.1021/acs.jpcb.5b01072
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
R. Böhmer
中科院分区:
文献类型:
--
作者:
S. Bauer;M. Storek;C. Gainaru;H. Zimmermann;R. Böhmer
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.
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