Medium effects on the electron spin resonance hyperfine splitting constants of tert-butyl nitroxide in mixed aqueous solvents

1974 ◽  
Vol 39 (25) ◽  
pp. 3800-3802 ◽  
Author(s):  
Gerard Stout ◽  
Jan B. F. N. Engberts
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Hyperfine Splitting ◽  
Medium Effects ◽  
Tert Butyl ◽  
Spin Resonance ◽  
Mixed Aqueous Solvents

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.

Correlation of optical and electron spin resonance spectra for alkali metal solutions in ethylamine and tetrahydrofuran

1976 ◽  
Vol 54 (19) ◽  
pp. 3110-3113 ◽  
Author(s):  
R. Catterall ◽  
J. Slater ◽  
W. A. Seddon ◽  
J. W. Fletcher
Keyword(s):  
Electron Spin Resonance ◽  
Optical Absorption ◽  
Alkali Metal ◽  
Electron Spin ◽  
Hyperfine Splitting ◽  
Pulse Radiolysis ◽  
Optical Absorption Spectra ◽  
Monomeric Species ◽  
Spin Resonance ◽  
Sodium Tetraphenylboron

The band maxima of transient optical absorption spectra observed by pulse radiolysis in ethylamine (EA)/tetrahydrofuran (THF) mixtures containing sodium tetraphenylboron are correlated with electron spin resonance (esr) hyperfine splitting constants obtained in potassium/EA/THF solutions. The data suggest that the optical spectra can be attributed to the same 'monomeric' species as observed by esr in alkali metal solutions.

An ESR and calorimetric study of iron oolitic samples from the Northampton ironstone

Clay Minerals ◽  
1990 ◽  
Vol 25 (3) ◽  
pp. 303-311 ◽  
Author(s):  
A. U. Gehring ◽  
R. Karthein
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Hyperfine Splitting ◽  
Esr Spectroscopy ◽  
Thermal Conversion ◽  
Esr Spectra ◽  
Calorimetric Study ◽  
Calorimetric Methods ◽  
Mineral Phases ◽  
Spin Resonance

AbstractElectron spin resonance (ESR) spectroscopy and calorimetric methods were used to characterize conversion processes in multimineral samples from the Northampton ironstone (NIS) at temperatures between 25°C and 800°C. The beginning of the thermal conversion processes can be determined by the formation of asymmetric ESR spectra with g ≈ 2 at 250°C. The breakdown of the berthierine structure between 250°C and 520°C is indicated by the disappearance of the hyperfine splitting in the Mn2+ spectrum and the formation of magnetite. The decomposition of siderite and calcite was found by calorimetric methods at 580°C and 700°C, respectively. The hematite formation between 550°C and 800°C is explained by the decomposition of siderite but also by the oxidation of previously formed magnetite. The occurrence of hematite as the dominant ferric oxide at 800°C signifies the end of the conversion process of the major mineral phases in the NIS samples.

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.

Radical cations of some substituted pyrenes

1970 ◽  
Vol 48 (13) ◽  
pp. 1996-1999 ◽  
Author(s):  
J. T. Cooper
Keyword(s):  
Electron Spin Resonance ◽  
Sulfur Dioxide ◽  
Chlorine Atom ◽  
Electron Spin ◽  
Hyperfine Splitting ◽  
Boron Trifluoride ◽  
Radical Cations ◽  
Molecular Orbital Calculations ◽  
Spin Resonance ◽  
First Time

The electron spin resonance spectra of several substituted pyrene cations, produced by oxidation with boron trifluoride in sulfur dioxide, are reported. The spectra are analyzed and the splitting constants given. With 4-chloropyrene, hyperfine splitting is observed due to the chlorine atom, for the first time in such a species. Molecular orbital calculations (Hückel and McLachlan) are presented for three of the compounds studied.

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