Matrix dependence of the electron spin resonance spectra of the radical trapped in different single crystals

1977 ◽  
Vol 55 (20) ◽  
pp. 3554-3558 ◽  
Author(s):  
J. P. Michaut ◽  
J. Roncin
Keyword(s):  
Electron Spin Resonance ◽  
Single Crystal ◽  
Single Crystals ◽  
Electron Spin ◽  
Experimental Error ◽  
Field Effect ◽  
Coupling Constants ◽  
Crystal Field Effect ◽  
Proton Coupling ◽  
Spin Resonance

Nitrogen and proton coupling tensors have been measured for the [Formula: see text] radical trapped in five different single crystal matrices. As all isotropic coupling constants are the same within experimental error (aN = 21.2 G, aH = 28.4 G), no measurable crystal field effect is found. In these solids the motions of the radical depend on the dimension of the trapping cage and the motions of the surrounding molecules.

ELECTRON SPIN RESONANCE OF X-RAY-IRRADIATED SINGLE CRYSTALS OF dl-ALANINE HYDROCHLORIDE

1962 ◽  
Vol 40 (6) ◽  
pp. 1060-1063 ◽  
Author(s):  
W. C. Lin ◽  
C. A. McDowell
Keyword(s):  
Electron Spin Resonance ◽  
Hyperfine Interaction ◽  
Single Crystal ◽  
Single Crystals ◽  
Electron Spin ◽  
X Ray ◽  
Spin Resonance ◽  
Interaction Tensor ◽  
Γ Ray

The electron spin resonance of an X-ray-irradiated single crystal of dl-alanine hydrochloride indicates that the radical formed is probably the same as that produced by X- and γ-ray irradiation of alanine. The components of the hyperfine interaction tensor for the radical have been evaluated.

ELECTRON SPIN RESONANCE STUDIES OF PHOTOLYTICALLY GENERATED AROMATIC KETYLS

1966 ◽  
Vol 44 (5) ◽  
pp. 551-559 ◽  
Author(s):  
Raymond Wilson
Keyword(s):  
Hydrogen Bonding ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Aprotic Solvent ◽  
Coupling Constants ◽  
Proton Coupling ◽  
Protic Solvents ◽  
Spin Resonance ◽  
Semi Empirical ◽  
Spin Densities

Electron spin resonance observations on the photolytically generated ketyls of benzaldehyde, acetophenone, and benzophenone in protic solvents are reported. Proton coupling constants differ considerably from those reported by other workers for the same ketyls generated by other methods in aprotic solvents.Molecular orbital calculations of unpaired electron spin densities, in which the effective electronegativities of the oxygen atoms on the ketyls are assumed to be increased by hydrogen bonding in protic solvents, are reported. The calculated changes in spin densities agree qualitatively with the semi-empirical changes calculated by the McConnell relationship.Observations on the dynamics of solvation of the benzaldehyde ketyl in a mixture of a protic and an aprotic solvent are reported and discussed.

THE ELECTRON SPIN RESONANCE SPECTRA OF DINITRONAPHTHALENE ANION RADICALS

1965 ◽  
Vol 43 (12) ◽  
pp. 3400-3406 ◽  
Author(s):  
P. H. H. Fischer ◽  
C. A. McDowell
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Coupling Constants ◽  
Radical Anions ◽  
Proton Coupling ◽  
Spin Resonance ◽  
Full Symmetry ◽  
Nitrogen Coupling ◽  
Anion Radicals

The radical anions of 1,4-dinitronaphthalene, 1,5-dinitronaphthalene, and 1,8-dinitronaphthalene have been generated by electrolytic means, and their e.s.r. spectra recorded. The spectra consist of 61, 111, and 85 lines respectively, and can be analyzed in terms of one nitrogen and three proton coupling constants, consistent with the full symmetry of the species giving rise to them. These constants are, for 1,4-dinitronaphthalene: aN = 0.97 G, aH2 = 1.69 G, aH5 = 0.53 G, and aH6 = 0.41 G; for 1,5-dinitronaphthalene: aN = 2.30 G, aH2 = 2.42 G, aH3 = 0.44 G, and aH4 = 2.82 G; for 1,8-dinitronaphthalene: aN = 3.03 G, aH2 = 3.63 G, aH3 = 0.95 G, and aH4 = 3.73 G. Whereas the nitrogen coupling constants can be unambiguously assigned, this, in the absence of deuteration studies say, is not the case for the three sets of equivalent protons. As an aid in the assignment of proton coupling constants, Hückel LCAO calculations and simplified SCFMO calculations by the method of McLachlan have been performed. The first mentioned of the above proton constants could thus be assigned with reasonable certainty, the remaining two aHi remain ambiguous.

Electron spin resonance studies of VO2+ in cadmium maleate dihydrate single crystals

Pramana ◽  
1985 ◽  
Vol 25 (6) ◽  
pp. 719-722 ◽  
Author(s):  
V Chandra Mouli ◽  
G Sivarama Sastry
Keyword(s):  
Electron Spin Resonance ◽  
Single Crystals ◽  
Electron Spin ◽  
Spin Resonance

Electron Spin Resonance of Mn2+ in Tl2Co(SeO4)2·6H2O Single Crystals

1986 ◽  
Vol 138 (1) ◽  
pp. K55-K58 ◽  
Author(s):  
V. K. Jain ◽  
V. P. Seth ◽  
R. S. Bansal ◽  
A. Yadav
Keyword(s):  
Electron Spin Resonance ◽  
Single Crystals ◽  
Electron Spin ◽  
Spin Resonance
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