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Reorientational dynamics of glycerol derived from temperature‐dependent multi‐nuclear magnetic resonance relaxation data
Author(s) -
Friedrich Anke,
Dölle Andreas,
Zeidler Manfred D.
Publication year - 2003
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1254
Subject(s) - chemistry , libration (molecule) , relaxation (psychology) , glycerol , nuclear magnetic resonance , nuclear overhauser effect , atmospheric temperature range , dynamics (music) , hydrogen , spin–lattice relaxation , nuclear magnetic resonance spectroscopy , thermodynamics , analytical chemistry (journal) , stereochemistry , nuclear quadrupole resonance , organic chemistry , physics , psychology , social psychology , geometry , point (geometry) , mathematics , acoustics
Longitudinal 1 H, 2 H and 13 C relaxation rates of [ 1 H 8 ]glycerol and [ 2 H 8 ]glycerol have been recorded at 250.13 MHz, 38.27 MHz and 62.89 MHz respectively, over the temperature range 260 to 350 K. In addition, the nuclear Overhauser enhancement factors of 13 C nuclei were recorded, since they depend only on the reorientational dynamics. It proved possible to fit all experimental data to a Cole–Davidson model extended by the Vogel–Fulcher–Tammann temperature dependence and the Lipari–Szabo libration parameter. Separate parameters were obtained for the inner CH and the outer CH 2 groups. The overall picture of glycerol is one of a hydrogen‐bonded liquid, where the outer CH 2 groups perform fast librational motions whereas the inner CH group is rigidly fixed. Copyright © 2003 John Wiley & Sons, Ltd.
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