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Diluting the hydrogen bonds in viscous solutions of n-butanol with n-bromobutane: II. A comparison of rotational and translational motions

Lederle, C. ; Hiller, W. ; Gainaru, C. ; Böhmer, R. :
Diluting the hydrogen bonds in viscous solutions of n-butanol with n-bromobutane: II. A comparison of rotational and translational motions.
In: Journal of chemical physics, 134 (6) 064512. ISSN 0021-9606
[Artikel] , (2011)

Kurzbeschreibung (Abstract)

Mixtures of the monohydroxy alcohol n-butanol with n-bromobutane are investigated via dielectric and nuclear magnetic resonance (NMR) techniques. Static- and pulsed-field gradient proton NMR yielded self-diffusion coefficients as a function of concentration and temperature. To monitor reorientational motions, broadband dielectric and (13)C-spin relaxation time measurements were carried out. The latter demonstrate that the structural relaxation stems from the motion of the alkyl chains. By combining data from translational diffusion coefficients with published shear viscosities, hydrodynamic radii were determined that compare favorably with the van der Waals radii of single molecules. The results for the neat alcohol and for the binary mixtures are discussed with respect to a recent transient chain model. The approach of Debye and structural relaxation times at high temperatures, identified as a general feature of monohydroxy alcohols, is also discussed within that framework.

Typ des Eintrags: Artikel
Erschienen: 2011
Autor(en): Lederle, C. ; Hiller, W. ; Gainaru, C. ; Böhmer, R.
Titel: Diluting the hydrogen bonds in viscous solutions of n-butanol with n-bromobutane: II. A comparison of rotational and translational motions
Sprache: Englisch
Kurzbeschreibung (Abstract):

Mixtures of the monohydroxy alcohol n-butanol with n-bromobutane are investigated via dielectric and nuclear magnetic resonance (NMR) techniques. Static- and pulsed-field gradient proton NMR yielded self-diffusion coefficients as a function of concentration and temperature. To monitor reorientational motions, broadband dielectric and (13)C-spin relaxation time measurements were carried out. The latter demonstrate that the structural relaxation stems from the motion of the alkyl chains. By combining data from translational diffusion coefficients with published shear viscosities, hydrodynamic radii were determined that compare favorably with the van der Waals radii of single molecules. The results for the neat alcohol and for the binary mixtures are discussed with respect to a recent transient chain model. The approach of Debye and structural relaxation times at high temperatures, identified as a general feature of monohydroxy alcohols, is also discussed within that framework.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of chemical physics
Band: 134
(Heft-)Nummer: 6
Verlag: American Institute of Physics
Freie Schlagworte: 1-Butanol/ chemistry Hydrocarbons, Brominated/ chemistry Hydrogen Bonding Magnetic Resonance Spectroscopy Motion Rotation Solutions Temperature
Fachbereich(e)/-gebiet(e): 05 Fachbereich Physik
05 Fachbereich Physik > Institut für Festkörperphysik
Hinterlegungsdatum: 28 Jan 2014 10:24
Zusätzliche Informationen:

Lederle, Christina Hiller, Wolf Gainaru, Catalin Bohmer, Roland Comparative Study Research Support, Non-U.S. Gov't United States J Chem Phys. 2011 Feb 14;134(6):064512. doi: 10.1063/1.3549123.

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