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  o-Terphenyl: flips of the end rings in the crystal phase

Stumber, M., Zimmermann, H., Schmitt, H., & Haeberlen, U. (2001). o-Terphenyl: flips of the end rings in the crystal phase. Molecular Physics, 99(13), 1091-1098. doi:10.1080/00268970110042613.

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Genre: Journal Article
Alternative Title : o-Terphenyl: flips of the end rings in the crystal phase

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MolPhys_99_2001_1091.pdf (Any fulltext), 276KB
 
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Stumber, Michael1, Author           
Zimmermann, Herbert2, 3, Author           
Schmitt, Heike4, Author           
Haeberlen, Ulrich1, Author           
Affiliations:
1Research Group Prof. Dr. Haeberlen, Max Planck Institute for Medical Research, Max Planck Society, ou_1497739              
2Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society, ou_1497705              
3Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society, ou_1497700              
4Department of Molecular Neurobiology, Max Planck Institute for Medical Research, Max Planck Society, ou_1497704              

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 Abstract: We demonstrate by selective saturation deuteron NMR experiments on a crystal of selectively deuterated o-terphenyl (OTP) that both end rings I and II attached to the central ring undergo thermally activated flip motions. In crystals of OTP, the end rings I and II are not symmetry related, their dynamics can be different and, in fact, is different, although mutual steric hindrance of the rings suggests a strong correlation. We measured the rates k I and k II of the flips of both end rings I and II as a function of temperature. We find that, independent of the temperature, k I exceeds k II by roughly a factor of 100. This result excludes correlated flips of rings I and II in the sense that a flip of one ring necessarily entails a flip of the other. The activation energies EaI and EaII of the two flip processes turn out to be equal (80.5 kJ mol−1) within experimental errors. This is taken as a hint that the flips are, after all, related to each other. A mechanism is proposed of how this is possible under the constraint k I » k II.

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Language(s): eng - English
 Dates: 2000-12-122001-02-072009-11-162001-07-10
 Publication Status: Published in print
 Pages: 8
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 Rev. Type: Peer
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Title: Molecular Physics
  Other : Mol. Phys.
Source Genre: Journal
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Publ. Info: London : Taylor & Francis
Pages: - Volume / Issue: 99 (13) Sequence Number: - Start / End Page: 1091 - 1098 Identifier: ISSN: 0026-8976
CoNE: https://pure.mpg.de/cone/journals/resource/954925264211