Electron spin resonance study of the hyperfine splitting constants of naturally abundant carbon-13 and nitrogen-15 in diphenylmethyl tert-butyl aminoxyl (nitroxide). Solvent and temperature effects

1984 ◽  
Vol 62 (8) ◽  
pp. 1653-1657 ◽  
Author(s):  
Edward G. Janzen
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Temperature Effects ◽  
Hyperfine Splitting ◽  
Electron Spin Resonance Study ◽  
Phenyl Radical ◽  
Tert Butyl ◽  
Radical Adduct ◽  
Spin Resonance ◽  
Spin Resonance Study

The β-13C and 15N hyperfine splitting constants in the phenyl radical adduct of phenyl tert-butyl nitrone (PBN), diphenylmethyl tert-butyl aminoxyl, have been measured as a function of solvent and temperature.

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.

An Electron Spin Resonance Study of the tert-Butylsulfinyl Radical

1974 ◽  
Vol 52 (4) ◽  
pp. 555-556 ◽  
Author(s):  
James A. Howard ◽  
Edward Furimsky
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Low Temperatures ◽  
Half Life ◽  
Electron Spin Resonance Study ◽  
Tert Butyl ◽  
Field Center ◽  
Spin Resonance ◽  
Butyl Peroxide ◽  
Spin Resonance Study

The tert-butylsulfinyl radical, (CH3)3CSO•, can be prepared directly in the cavity of an e.p.r. spectrometer by photolysis of di-tert-butyl peroxide in a solution of tert-butylsulfenic acid in toluene or isopentane at low temperatures (−40° to−100°). The e.s.r. spectrum consists of a rather broad singlet (ΔHmis ∼ 1.9 G) with the field center at g = 2.0106.This radical undergoes self-reaction by a bimolecular process and a 2.5 × 10−7 M solution has a half-life of 0.07 s at −100 °C. It is, therefore, much shorter-lived than the iso-structural tert-butylperoxy radical, (CH3)3COO•.

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