Comments on the observation of carbon-13 hyperfine interaction in the electron spin resonance spectra of bis(diethyldithiocarbamato)copper(II)

1977 ◽  
Vol 16 (7) ◽  
pp. 1824-1826 ◽  
Author(s):  
D. Attanasio
Keyword(s):  
Electron Spin Resonance ◽  
Hyperfine Interaction ◽  
Electron Spin ◽  
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.

Metal complexes as antioxidants. VI. An electron spin resonance study of the transient cupric complexes formed in the reaction of cupric dialkyldithiocarbamates with alkylperoxy radicals and alkyl hydroperoxides

1978 ◽  
Vol 56 (2) ◽  
pp. 164-169 ◽  
Author(s):  
James Anthony Howard ◽  
John Charles Tait
Keyword(s):  
Electron Spin Resonance ◽  
Hyperfine Interaction ◽  
Metal Complexes ◽  
Electron Spin ◽  
Hyperfine Splitting ◽  
Electron Spin Resonance Study ◽  
Alkyl Hydroperoxides ◽  
Spin Resonance ◽  
Alkylperoxy Radicals ◽  
Spin Resonance Study

The epr spectra of three intermediate copper(II) complexes formed by oxidation of bis[N,N-dialkyl(dithiocarbamato-S,S′)] copper(II) by alkyl hydroperoxides and alkylperoxy radicals are reported. Isotropic and anisotropic spectra of the complexes formed from alkylperoxy radicals enriched with 17O are consistent with the following structures: [Cu(S2CNR2)(OS2CNR2)] (I), [Cu(OS2CNR2)2] (II), and [Cu(OS2CNR2)(O2S2CNR2)] (III). The isotropic 17O hyperfine interaction of I is 19.2 G while the anisotropic spectrum of II indicates that the two oxygen nuclei are equivalent. The anisotropic 17O hyperfine splitting constants are consistent with a structure for these complexes in which the S—O bond(s) is directed out of the plane of the complex and not coordinated to the copper.

The electron spin resonance spectrum of (CH3)313COO

1979 ◽  
Vol 57 (3) ◽  
pp. 253-254 ◽  
Author(s):  
J. A. Howard
Keyword(s):  
Electron Spin Resonance ◽  
Hyperfine Interaction ◽  
Electron Spin Resonance Spectrum ◽  
Electron Spin ◽  
Resonance Spectrum ◽  
Esr Spectrum ◽  
Spin Resonance

The esr spectrum of (CH3)313COO• has been observed in solution and the hyperfine interaction with the carbon-13 nucleus is 3.92 G.

ELECTRON SPIN RESONANCE OF AN X-RAY IRRADIATED SINGLE CRYSTAL OF DIKETOPIPERAZINE

1963 ◽  
Vol 41 (1) ◽  
pp. 9-13 ◽  
Author(s):  
W. C. Lin ◽  
C. A. McDowell
Keyword(s):  
Magnetic Field ◽  
Electron Spin Resonance ◽  
Hydrogen Atom ◽  
Hyperfine Interaction ◽  
Single Crystal ◽  
Electron Spin ◽  
X Ray ◽  
Spin Resonance ◽  
Interaction Tensor ◽  
Γ Ray

The electron spin resonance of an X-ray irradiated single crystal of diketopiperazine has been measured at 9 Gc/sec for various orientations of the crystal in the static magnetic field. From an analysis of the hyperfine structure observed we have been able to calculate the components of the hyperfine interaction tensor for the radical produced by the irradiation. The principal values for the hyperfine interaction tensor are similar to those found for the radical produced by the X-ray or γ-ray irradiation of glycylglycine and N-acetylglycine and is therefore attributed to a radical with a C—H fragment. The fine details of the spectrum indicate that the radical responsible for the electron resonance observed probably has the structure [Formula: see text]which is formed from diketopiperazine by the loss of a hydrogen atom from one of the CH2 groups in that molecule.

The spin Hamiltonian for electron spin resonance of radicals in doublet states: calculations in the energy weighted maximum overlap model

1978 ◽  
Vol 361 (1707) ◽  
pp. 487-512 ◽  
Keyword(s):  
Electron Spin Resonance ◽  
Hyperfine Interaction ◽  
Electron Spin ◽  
Quadrupole Interaction ◽  
Central Atom ◽  
Crystalline Solids ◽  
Spin Hamiltonian ◽  
Spin Resonance ◽  
Interaction Tensor ◽  
Overlap Model

The parameters of a spin Hamiltonian for the description of electron spin resonance spectra of oriented radicals, trapped in crystalline solids, are described within an approximate electron propagator framework. Only radicals in doublet states are considered, so that the pertinent parameters are the g-tensor, the hyperfine interaction tensor and the quadrupole interaction tensor. Various semiempirical approaches are discussed and a number of calculations are carried out in the energy weighted maximum overlap model (e. w. m. o.). Particularly satisfactory results were obtained for the g-tensors and ‘central’ atom hyperfine interaction tensors.

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