Anisotropic proton hyperfine interaction in the electron spin resonance spectra of the n‐propyl and n‐butyl radicals in an argon matrix at 4.2 K

1974 ◽  
Vol 60 (4) ◽  
pp. 1619-1623 ◽  
Author(s):  
C. A. McDowell ◽  
K. Shimokoshi
Keyword(s):  
Electron Spin Resonance ◽  
Hyperfine Interaction ◽  
Electron Spin ◽  
Argon Matrix ◽  
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.

Electron spin resonance studies of oriented NO2 and NF2 in inert matrices at low temperatures

1970 ◽  
Vol 48 (5) ◽  
pp. 805-817 ◽  
Author(s):  
C. A. McDowell ◽  
H. Nakajima ◽  
P. Raghunathan
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Low Temperatures ◽  
Hyperfine Splitting ◽  
Preferential Orientation ◽  
Paramagnetic Species ◽  
Host Matrix ◽  
Argon Matrix ◽  
Spin Resonance ◽  
Inert Matrices

Preferentially oriented NO2 and NF2 in inert matrices have been studied in some detail by electron spin resonance methods at 4.2 °K. Methods are discussed which may optimize the degree of preferential orientation of the paramagnetic species in appropriate matrices. The results demonstrate that while neon is the best host matrix for orienting NO2, argon is to be preferred for NF2. The g-values and hyperfine splitting data have been accurately determined and are compared with earlier values. Motional processes are suggested to explain the spectra obtained for NF2 in an argon matrix in the temperature range 4–30 °K.

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.

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