Electron paramagnetic resonance study of radicals derived from 2- and 3-fluoropropene

1993 ◽  
Vol 71 (6) ◽  
pp. 809-813 ◽  
Author(s):  
Peter Smith ◽  
Cynthia Ann Hougum ◽  
Art Aresh Hosseinian
Keyword(s):  
Electron Paramagnetic Resonance ◽  
General Formula ◽  
Continuous Flow ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Electron Paramagnetic Resonance Study ◽  
Reaction System ◽  
Spectroscopic Properties ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

Using the TiCl3–H2O2, –NH2OH, −Na2S2O8, and −H2O2/Na2SO3, continuous-flow, radical-generating methods at 25 °C, we have successfully characterized by electron paramagnetic resonance spectroscopy radicals formed by the reaction of each of the substrates 2- and 3-fluoropropene with the radicals •OH, •NH3+, •OSO3−, and •SO3−, respectively. With 2-and 3-fluoropropene, respectively, the radicals identified were of general formula CH2(X)ĊFCH3 and CH2(X)ĊHCH2F where -X is the added group, except that treatment of 3-fluoropropene with the TiCl3–H2O2 reaction system also yielded •CH2CH(X)CH2F. The results obtained are discussed in terms of the effect of the presence of the fluorine substituent on both the apparent reactivity of the substrate molecules towards the radical-generating systems and the spectroscopic properties of the radicals observed.

Modification of Si(001)/SiO2 Interfaces by Nitric Oxide Treatments: An Electron Paramagnetic Resonance Study

1999 ◽  
Vol 592 ◽  
Author(s):  
Jean-Louis Cantin ◽  
Hans Jurgen von Bardeleben
Keyword(s):  
Nitric Oxide ◽  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Electron Paramagnetic Resonance Study ◽  
Thermal Relaxation ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Defect Reduction ◽  
N Incorporation ◽  
Electron Paramagnetic

ABSTRACTThe modification of the Si(001)/SiO2 interface and the related interface defect reduction by thermal treatments in nitric oxide (NO) have been studied by Electron Paramagnetic Resonance spectroscopy for 630Å thick and ultrathin (28Å) oxides. The effects of annealing temperature, annealing time and rapid (RTN) or furnace annealing have been explored. Our results show that an appropriate NO treatment can drastically reduce the defect densities if, in addition to N incorporation in the transition layer near the interface, the thermal relaxation of the nitrided oxide is allowed. Our results indicate that NO treatment can lead to “defect free” Si/SiO2 interfaces.

Reactivity of SnO2, Ruthenium-Supported SnO2, Ruthenium (Platinum) Ion-Exchanged SnO2 with Inert, Combustible Gases and Air: An Electron Paramagnetic Resonance Study

1998 ◽  
Vol 547 ◽  
Author(s):  
C. Canevali ◽  
N. Chiodini ◽  
F. Morazzoni ◽  
R. Scotti
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Sol Gel ◽  
Electron Paramagnetic Resonance Study ◽  
High Sensitivity ◽  
Oxide Surface ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Electron Transfer Processes ◽  
Electron Paramagnetic

AbstractSnO2, Ru/SnO2 and Pt/SnO2 were prepared by sol-gel condensation method. Ru/SnO2 was also obtained by supporting the metal on SnO2 xerogel. The reactivity of these materials towards CO and air, studied by Electron Paramagnetic Resonance spectroscopy (EPR), suggests that the electron transfer processes at the oxide surface are favored by the presence of the metal, in the order Pt > Ru ion-exchanged > Ru-supported. A rationale was given for the differences and for the choice of a material suitable to high sensitivity gas sensors.

Electron paramagnetic resonance study of the reactions of the spin trap 2,4,6-tribromonitrosobenzene in benzene solutions

1992 ◽  
Vol 70 (1) ◽  
pp. 116-120 ◽  
Author(s):  
Peter Smith ◽  
Kirk Randall Maples ◽  
Ramona Lillian Lau
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Spin Trap ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Electron Paramagnetic Resonance Study ◽  
Azo Compounds ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Ene Reaction ◽  
Free Radical Formation ◽  
Electron Paramagnetic

By means of static-sample studies involving the thermal decomposition of symmetric azo compounds and the oxidation of substrates with nickel peroxide, we have characterized by electron paramagnetic resonance 12 spin adducts of 2,4,6-tribromonitrosobenzene, 1, in benzene at 25 °C. In addition, we have used electron paramagnetic resonance spectroscopy to investigate benzene solutions of 1 both by itself and in the presence of olefins, and both in the presence and absence of light. Although 1 by itself did not give evidence for any free radical formation, when 1 was mixed with any one of the 11 olefins tested we could detect nitroxide formation. The presence of light did not affect our results. These observations support the "ene" reaction mechanism of nitroxide formation. Keywords: 2,4,6-tribromonitrosobenzene, spin trapping, nickel peroxide.

scholarly journals Studies of Aldehyde Oxidase by Electron Paramagnetic Resonance Spectroscopy

1968 ◽  
Vol 243 (14) ◽  
pp. 3784-3796 ◽  
Author(s):  
K V Rajagopalan ◽  
P Handler ◽  
G Palmer ◽  
H Beinert
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Aldehyde Oxidase ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic
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