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.

Methyl "radicals" on doped silica gel surfaces

1969 ◽  
Vol 47 (18) ◽  
pp. 3367-3369 ◽  
Author(s):  
E. J. Casey ◽  
C. W. M. Grant ◽  
C. L. Gardner
Keyword(s):  
Electron Spin Resonance ◽  
Silica Gel ◽  
Electron Spin ◽  
Line Intensity ◽  
Free Electron ◽  
Hyperfine Splitting ◽  
Silica Gels ◽  
Methyl Radicals ◽  
Spin Resonance ◽  
Hot Oxygen

Methyl radicals adsorbed on silica gels containing dopings of the semiconductor ZnO were investigated by electron spin resonance at 77 °K. In addition to the normal 4-line "a"-spectrum, with hyperfine splitting of 23.3 ± 0.2 G, a second broader 4-line spectrum "b" with splitting 18.8 ± 0.6 G appears. Variations in line intensity with extent of doping were measured. Disappearance of the b-spectrum when the doped gels were dried under hot oxygen was observed. Partial delocalization of the radical's free electron and mixing into the doped surface were clearly indicated.Satellites ("c") to the a-spectrum were observed and are discussed.

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.

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.

Electron-spin-resonance determination of the internal field within the superconductorYBa2Cu3O7

1990 ◽  
Vol 41 (4) ◽  
pp. 2046-2048 ◽  
Author(s):  
Horacio A. Farach ◽  
Eduardo Quagliata ◽  
Taha Mzoughi ◽  
Manuel A. Mesa ◽  
Charles P. Poole ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Internal Field ◽  
Spin Resonance

THE ELECTRON SPIN RESONANCE SPECTRA OF THE POSITIVE AND NEGATIVE IONS OF DIPHENYLENE

1960 ◽  
Vol 38 (4) ◽  
pp. 503-507 ◽  
Author(s):  
C. A. McDowell ◽  
J. R. Rowlands
Keyword(s):  
Electron Spin Resonance ◽  
Hyperfine Interaction ◽  
Electron Spin ◽  
Negative Ions ◽  
Negative Ion ◽  
Spin Resonance ◽  
Hyperfine Splittings ◽  
Positive Ion

The electron spin resonance spectra of the positive and negative ions of diphenylene have been measured. It has been found that these spectra consist of five lines showing that the observed hyperfine interaction is caused by four equivalent protons. The over-all extent of the positive ion spectrum is 18 gauss compared with that of 12.9 gauss for the negative ion. The hyperfine splittings observed are 4.0 gauss and 2.75 gauss respectively.

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