Molecular motion of polyethylene oxide in dilute solutions studied by electron spin resonance and nuclear magnetic relaxation

1979 ◽  
Vol 75 (0) ◽  
pp. 349-358 ◽  
Author(s):  
Marie-Claude Lang ◽  
Françoise Lauprêtre ◽  
Claudine Noël ◽  
Lucien Monnerie
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Polyethylene Oxide ◽  
Magnetic Relaxation ◽  
Molecular Motion ◽  
Nuclear Magnetic Relaxation ◽  
Dilute Solutions ◽  
Spin Resonance ◽  
Nuclear Magnetic

Dielektrische Relaxation und Elektronenspinrelaxation von Eisen(III)acetylacetonat in verdünnter Lösung/ Dielectric Relaxation and Electron Spin Relaxation of Ferric Acetylacetonate in Dilute Solutions

1976 ◽  
Vol 31 (5) ◽  
pp. 457-462
Author(s):  
W. Dietz ◽  
H. Kilp ◽  
W. Noerpel ◽  
M. Straßmann ◽  
M. Stockhausen
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Correlation Time ◽  
Wave Length ◽  
Dilute Solutions ◽  
Electron Spin Relaxation ◽  
Electron Spin Resonance Linewidth ◽  
Spin Resonance ◽  
Solvent Molecules ◽  
Permittivity Measurements

Abstract The dielectric loss and electron spin resonance linewidth of ferric acetylacetonate have been measured in dilute solutions of benzene, m-and p-xylene, mesitylene and carbon tetrachloride. Permittivity measurements were made at 10 frequencies in the microwave region (1.2 m to 1 mm wave-length), ESR measurement at 2 frequencies (X and Q band). The permittivity results show a broad non-Debye pattern, yielding a mean correlation time of about 4 ps. The ESR results yield a mean correlation time of about 3 ps. The parallelism between the results obtained by both methods is discussed in view of a common relaxation process, which is the transient deformation of the chelate system resulting from stochastic induction by neighbouring solvent molecules.

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