scholarly journals Electron spin resonance study of γ-irradiated dipotassium difluoromalonate monohydrate

1970 ◽  
Vol 48 (3) ◽  
pp. 447-450 ◽  
Author(s):  
F. G. Herring ◽  
W. C. Lin ◽  
M. R. Mustafa
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Electron Spin Resonance Study ◽  
Carboxylate Group ◽  
Γ Irradiation ◽  
Spin Resonance ◽  
Spin Resonance Study

The γ-irradiation of dipotassium difluoromalonate monohydrate led to the formation of two molecular configurations of the ĊF2CO2− radical in addition to the previously identified ĊF(CO2−)2 radical. A comparison of the α-fluorine coupling in the two forms of the ĊF2CO2− radical indicates that loss of a carboxylate group nearly coplanar with the C—C—C plane in the undamaged molecule is favored.

Electron spin resonance study of γ-irradiated tetraethylammonium iodide

1968 ◽  
Vol 46 (16) ◽  
pp. 2749-2752 ◽  
Author(s):  
L. Fabes ◽  
J. K. S. Wan
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Secondary Reaction ◽  
Electron Spin Resonance Study ◽  
Methyl Radicals ◽  
Γ Irradiation ◽  
Spin Resonance ◽  
Secondary Radical ◽  
Tetraethylammonium Iodide ◽  
Spin Resonance Study

γ-Irradiation of polycrystalline tetraethylammonium iodide at 77°K leads to the breaking of a C—C bond and the primary radicals ĊH3 and [Formula: see text] were detected by electron spin resonance. The methyl radicals were found to disappear readily at 120°K. In the range of 263–273°K a secondary reaction between [Formula: see text] and the parent ion [Formula: see text] was observed; the resulting secondary radical [Formula: see text] was found to be stable up to 373°K.

Electron spin resonance study of γ-irradiated ethyleneimine in the solid state

1969 ◽  
Vol 47 (14) ◽  
pp. 2601-2603 ◽  
Author(s):  
D. Cordischi ◽  
R. Di Blasi
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Hyperfine Coupling ◽  
Glassy State ◽  
Coupling Constants ◽  
Electron Spin Resonance Study ◽  
Γ Irradiation ◽  
Spin Resonance ◽  
Anisotropic Hyperfine ◽  
Spin Resonance Study

The electron spin resonance (e.s.r.) study of the ethyleneimine in polycrystalline and glassy state shows that the radical [Formula: see text] is formed by γ-irradiation at 77 °K. The features of the e.s.r. spectrum of this radical are discussed in terms of the isotropic and anisotropic hyperfine coupling constants of the hydrogen and nitrogen nuclei. The effects of bleaching the γ-irradiated sample with visible and ultraviolet light are also reported.

An Electron Spin Resonance Study of Radicals Formed by γ-Irradiation of 1-Substituted 5-Nitro-amino and 5-Nitroso-aminotetrazoles

1974 ◽  
Vol 52 (8) ◽  
pp. 1248-1252 ◽  
Author(s):  
Richard C. Catton ◽  
Richard N. Butler
Keyword(s):  
Electron Spin Resonance ◽  
Electron Capture ◽  
Electron Spin ◽  
Bond Cleavage ◽  
Nitroxide Radical ◽  
Electron Spin Resonance Study ◽  
Γ Irradiation ◽  
Spin Resonance ◽  
The Stability ◽  
Spin Resonance Study

γ-Irradiation of 1-methyl-5-methylnitro-aminotetrazole 1 and 1-methyl-5-nitro-aminotetrazole 2 resulted in cleavage of the exocyclic N—N bond giving only one detectable radical (NO2•) in each case. The stability and motion of the NO2• radicals formed in these systems was studied. The NO2• radical obtained from compound 1 was immobile in the lattice while that obtained from compound 2 was rotating about the y-axis. Irradiation of 1-methyl-5-methyl-nitroso-aminotetrazole 3 and 1-phenyl-5-nitroso-aminotetrazole 4 did not give a simple N—N bond cleavage and radicals which could not be fully identified were encountered. The radical obtained from compound 3 appeared to be a nitroxide radical and that obtained from compound 4 appeared to arise from electron capture by the nitrosamino moiety.

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