scholarly journals Electron Spin Resonance of γ-Irradiated Taurine

1972 ◽  
Vol 50 (1) ◽  
pp. 43-49 ◽  
Author(s):  
G. Lind ◽  
R. Kewley
Keyword(s):  
Electron Spin Resonance ◽  
Hyperfine Interaction ◽  
Electron Spin ◽  
Unpaired Electron ◽  
Hyperfine Coupling ◽  
The Third ◽  
Coupling Tensor ◽  
Spin Resonance ◽  
Powder Samples ◽  
G Value

The 9.5 GHz electron spin resonance (e.s.r.) spectra of single crystal and powder samples of γ-irradiated taurine, [Formula: see text], have been recorded. Overlapping spectra from three distinct radicals are present. The first of these is the species SO3− with an isotropic g-value of 2.0035 and a 33S hyperfine coupling tensor with principal values 135.2, 99.2, and 97.9 G. The second radical is a π-electron species with the unpaired electron mainly on carbon and exhibiting hyperfine interaction from at least four protons, probably [Formula: see text] and with principal g-values 2.0021, 2.0027, and 2.0034. The third radical has principal g-values 2.0024, 2.0056, and 2.0097 and principal values of the 33S hyperfine tensor of 49.6, 9.1, and 1.2 G. The proposed structure for this radical is [Formula: see text]

Irradiation Damage Centers in Magnesiumhypophosphite

1975 ◽  
Vol 30 (8) ◽  
pp. 1044-1048 ◽  
Author(s):  
F. Köksal ◽  
H. Yüksel
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Unpaired Electron ◽  
Hyperfine Coupling ◽  
Irradiation Damage ◽  
Paramagnetic Species ◽  
Isotropic Hyperfine Coupling ◽  
Spin Resonance ◽  
Interaction Tensor ◽  
Gamma Irradiated

Abstract An analysis of the electron spin resonance spectra of gamma-irradiated crystals of magnesium-hypophosphite, Mg (H2PO2)2 · 6 H2O, has shown that the main long-lived paramagnetic species produced by gamma-irradiation are HPO2- and PO3- ionic radicals. The hyperfine interaction tensor of the phosphorous nucleus has the principal values T|| = 1674, T⊥ = 1221 Mc/s in HPO2- and T|| = 2490, T⊥ = 1847 Mc/s in PO3-. In HPO2- , interaction of the unpaired electron with the proton gives rise to an almost isotropic hyperfine coupling of 233 Mc/s. These results indicate that the orbitals occupied by the unpaired electron in both HPO2- and PO3= are sp3 -hybrid σ-orbitals centered on the phosphorous nuclei.

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.

Electron spin resonance of .beta.-chloroalkyl nitroxides. Angular dependence of .beta.-chlorine hyperfine coupling

1970 ◽  
Vol 74 (15) ◽  
pp. 3025-3027 ◽  
Author(s):  
Edward G. Janzen ◽  
Bruce R. Knauer ◽  
Lewis T. Williams ◽  
William B. Harrison
Keyword(s):  
Electron Spin Resonance ◽  
Angular Dependence ◽  
Electron Spin ◽  
Hyperfine Coupling ◽  
Spin Resonance

A comparison of electron spin resonance α- and β-hyperfine coupling constants in para-substituted α-phenethyl radicals

1986 ◽  
Vol 64 (4) ◽  
pp. 769-772 ◽  
Author(s):  
Donald R. Arnold ◽  
A. Martin de P. Nicholas ◽  
Kent M. Young
Keyword(s):  
Electron Spin Resonance ◽  
Experimental Evidence ◽  
Linear Relationship ◽  
Electron Spin ◽  
Hyperfine Coupling ◽  
Coupling Constants ◽  
Hyperfine Coupling Constants ◽  
Spin Resonance ◽  
Benzyl Radicals ◽  
Spin Delocalization

The linear relationship between the electron spin resonance hyperfine coupling constants (hfc) of the α- and β-hydrogens of para-substituted α-phenethyl radicals provides experimental evidence that the magnitude of both the α- and β -hfc is determined largely by the extent of spin delocalization in these benzylic systems. The [Formula: see text] scale, developed using substituted benzyl radicals, is shown to apply to phenethyl radicals as well.

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