Electron spin resonance evidence for the pyramidal structure of the radical-center carbon atom of 7-oxabicyclo[2.2.1]hept-2-yl radicals

1970 ◽  
Vol 92 (24) ◽  
pp. 7222-7224 ◽  
Author(s):  
Takashi. Kawamura ◽  
Tohru. Koyama ◽  
Teijiro. Yonezawa
Keyword(s):  
Electron Spin Resonance ◽  
Carbon Atom ◽  
Electron Spin ◽  
Radical Center ◽  
Pyramidal Structure ◽  
Spin Resonance

The Detection of Alkoxy and Other Radicals in the Gamma Radiolysis of Alcohols by an Electron Spin Resonance and Spin Trapping Method

1974 ◽  
Vol 52 (21) ◽  
pp. 3645-3650 ◽  
Author(s):  
Frederick Peter Sargent ◽  
Edward Michael Gardy
Keyword(s):  
Electron Spin Resonance ◽  
Carbon Atom ◽  
Electron Spin ◽  
Spin Trapping ◽  
Methyl Radicals ◽  
Alkoxy Radicals ◽  
Spin Resonance ◽  
Gamma Radiolysis ◽  
Trapping Method

The radicals produced during γ radiolysis of methanol, ethanol, 1-propanol, 2-propanol, and t-butanol have been trapped by reaction with 2-nitroso-2-methylpropane (t-nitrosobutane) to give nitroxides which are detected by e.s.r.[Formula: see text]All the alcohols gave alkoxy radicals and, with the exception of t-butanol, radicals derived by the loss of an H atom from the carbon atom adjacent to the OH group. Methyl radicals were detected in t-butanol.

Correlation Between Defects and Electrical Conduction in Surface Conductive Layer of CVD-diamond Films

1996 ◽  
Vol 442 ◽  
Author(s):  
Y. Show ◽  
F. Matsuoka ◽  
S. Ri ◽  
Y. Akiba ◽  
T. Kurosu ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Carbon Atom ◽  
Electron Spin ◽  
Electrical Conduction ◽  
Nearest Neighbor ◽  
Diamond Films ◽  
Cvd Diamond ◽  
Conductive Layer ◽  
Dangling Bond ◽  
Spin Resonance

Correlation between defects and electrical conduction in surface conductive layers of CVD diamond films has been studied using electron spin resonance ( ESR ) and two points probe technique methods. The ESR analysis revealed the presence of Pac-center with spin density of 1020 spins/cm3. The Pac-center is composed from two ESR signals: ESR signal from carbon dangling bond with carbon atom neighbors and ESR signal from carbon dangling bond associated with nearest neighbor hole ( hole associated Pac-center ). The hole associated Pac-center is an electrically active defect.

The Effects of α-Halogen Substitution on the Configuration of Alkyl Radicals in Solution by Electron Spin Resonance

1974 ◽  
Vol 52 (20) ◽  
pp. 3529-3538 ◽  
Author(s):  
Kuang S. Chen ◽  
Jay K. Kochi
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Hyperfine Interactions ◽  
Radical Center ◽  
Radical Site ◽  
Alkyl Radicals ◽  
Pyramidal Configuration ◽  
Spin Resonance ◽  
Hyperfine Splittings ◽  
G Factors

The e.s.r. spectra of a variety of alkyl radicals with α-halogen substituents have been examined in solution. The configurations of α-halogen substituted ethyl and β,β,β-trifluoroethyl radicals are correlated with the hyperfine splittings of α-methyl protons and α-trifluoromethyl fluorines, respectively. For an α-fluorine substituent, electronegativity plays an important role in determining the pyramidal configuration of the radical center, whereas size appears to be a more important factor with chlorine and bromine in promoting a less pyramidal configuration at the radical center. Two α-halogen substituents have a disproportionately greater effect than one halogen in influencing the configuration at the radical site. The g-factors of fluoroalkyl radicals are qualitatively analyzed in order to discuss possible mechanisms of β-fluorine hyperfine interactions and the effect of trifluoromethyl substitution on the configuration of the radical site.

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