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          Institute: MPI für medizinische Forschung     Collection: Forschungsgruppe Prof. Dr. Haeberlen     Display Documents



ID: 568747.0, MPI für medizinische Forschung / Forschungsgruppe Prof. Dr. Haeberlen
o−Terphenyl: flips of the end rings in the crystal phase
Translation of Title:o−Terphenyl: flips of the end rings in the crystal phase
Authors:Stumber, Michael; Zimmermann, Herbert; Schmitt, Heike; Haeberlen, Ulrich
Language:English
Date of Publication (YYYY-MM-DD):2001-07-10
Title of Journal:Molecular Physics
Journal Abbrev.:Mol. Phys.
Volume:99
Issue / Number:13
Start Page:1091
End Page:1098
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description: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 kI and kII of the flips of both end rings I and II as a function of temperature. We find that, independent of the temperature, kI exceeds kII 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 kI>kII
Last Change of the Resource (YYYY-MM-DD):--
External Publication Status:published
Document Type:Article
Communicated by:Wulf Kaiser
Affiliations:MPI für medizinische Forschung/Abteilung Biophysik
MPI für medizinische Forschung/Abteilung Molekulare Neurobiologie
MPI für medizinische Forschung/Forschungsgruppe Prof. Dr. Haeberlen
MPI für medizinische Forschung/Arbeitsgruppe Zimmermann
MPI für medizinische Forschung/Abteilung Molekulare Physik
Identifiers:LOCALID:5031
URI:http%3A%2F%2Fwww.journalsonline.tandf.co.uk%2Fopen...
URI:http%3A%2F%2Ftaylorandfrancis.metapress.com%2Fapp%...
DOI:10.1080%2F00268970110042613%20
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