THE ELECTRON SPIN RESONANCE ABSORPTION SPECTRA OF SEMIQUINONE IONS: PART II. THE HYPERFINE SPLITTING DUE TO AMINO GROUPS

1960 ◽  
Vol 38 (7) ◽  
pp. 1167-1171 ◽  
Author(s):  
Y. Matsunaga ◽  
C. A. McDowell
Keyword(s):  
Electron Spin Resonance ◽  
Absorption Spectra ◽  
Electron Spin ◽  
Hyperfine Splitting ◽  
Amino Nitrogen ◽  
Resonance Absorption ◽  
Amino Groups ◽  
Spin Resonance ◽  
Fine Splitting ◽  
Hyperfine Splittings

The electron spin resonance absorption spectra of amino-substituted p-benzosemiquinone ions have been examined. The hyperfine splittings due to the amino protons and the amino nitrogen atom have been demonstrated. It has been found that the magnitude of the hyper fine splitting constants due to these two kinds of nuclei depends very much on the nature of the free radical.

THE ELECTRON SPIN RESONANCE ABSORPTION SPECTRA OF SEMIQUINONE IONS: PART I. THE HYPERFINE SPLITTING DUE TO ALKOXY GROUPS

1960 ◽  
Vol 38 (7) ◽  
pp. 1158-1166 ◽  
Author(s):  
Y. Matsunaga ◽  
C. A. McDowell
Keyword(s):  
Electron Spin Resonance ◽  
Absorption Spectra ◽  
Electron Spin ◽  
Hyperfine Splitting ◽  
Resonance Absorption ◽  
Alkyl Gallates ◽  
Alkyl Groups ◽  
Spin Resonance ◽  
Hyperfine Splittings ◽  
Alkoxy Groups

The electron spin resonance absorption spectra of semiquinone ions with alkoxy groups have been examined and compared with those with substituted alkyl groups. The splitting constant for the alkoxy protons has been found to be about one-half that of alkyl protons in the corresponding free radical. Hyperfine splittings due to methoxy, ethoxy, and isopropoxy protons have been demonstrated using the semiquinone ions formed by oxidation of alkyl gallates. The available evidence suggests that, in accounting for the hyperfine splitting due to alkyl protons, spin polarization is as important as electron delocalization.

An Electron Spin Resonance Examination of Ferrocenylalkyl- and Aryl Ketyls

1972 ◽  
Vol 50 (12) ◽  
pp. 1825-1830 ◽  
Author(s):  
G. Bigam ◽  
John Hooz ◽  
Siegfried Linke ◽  
R. E. D. McClung ◽  
Melvyn W. Mosher ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Free Electron ◽  
Hyperfine Splitting ◽  
Electron Densities ◽  
Spin Resonance ◽  
Hyperfine Splittings ◽  
Insight Into

Several ferrocenylalkyl- and aryl ketyls were generated and their e.s.r. spectra were recorded. Pentadeuterio-benzoylferrocene and benzoyl perdeuterioferrocene were synthesized. Analysis of the e.s.r. spectra of their corresponding ketyls enabled the determination of the hyperfine splitting constants of benzoylferrocene ketyl, and allowed an assignment of the electron densities at various positions in the molecule.A comparison of the magnitudes of the g-values for the ketyls derived from benzophenone (2.0034), benzoylferrocene (2.0062), and 2,2-dimethylpropanoylferrocene (2.0126), combined with the proton hyperfine splittings, gave some insight into the nature of the interaction of the free electron with the ferrocene system.

Electron Spin Resonance Absorption Spectra of Hole‐Trap Centers Associated with Phosphorous in Irradiated Single Crystal Calcite

1969 ◽  
Vol 51 (11) ◽  
pp. 4978-4982 ◽  
Author(s):  
R. A. Serway ◽  
S. A. Marshall ◽  
J. A. McMillan ◽  
R. L. Marshall ◽  
W. D. Ohlsen
Keyword(s):  
Electron Spin Resonance ◽  
Single Crystal ◽  
Absorption Spectra ◽  
Electron Spin ◽  
Resonance Absorption ◽  
Hole Trap ◽  
Spin Resonance
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