2 edition of Electron spin resonance study of substituted anthrasemiquinone radical anions. found in the catalog.
Electron spin resonance study of substituted anthrasemiquinone radical anions.
Naseer Uddin Ahmad
PhD thesis, Chemistry.
Electron spin resonance (ESR) studies have been made of radical cations prepared by the oxidation of 24 aromatic hydrocarbons with SbCl 5 in CH 2 Cl 2 solvent. The transfer of reagents, reactions, and ESR measurements were carried out at temperatures below −78°C in the absence of air. The stability of the radicals in solution, and the resolution of ESR hyperfine structure, depended. The ESR spectra assigned to the anion radicals of SO 2 −, (TCNE) − (tetracyanoethylene), and O 2 − were obtained for, respectively, sulfur dioxide, TCNE, and oxygen when these gases were adsorbed on γ-irradiated silica gel. As regards sulfur dioxide, a characteristic change in the concentration of the SO 2 − radical was observed during the post-irradiation with high-energy UV light.
Sealy RC, Swartz HM, Olive PL. Electron spin resonance-spin trapping. Detection of superoxide formation during aerobic microsomal reduction of nitro-compounds. Biochem Biophys Res Commun. May 30; 82 (2)– Wardman P. Letter: Protonation of the radical-anions of nitro-imidazole radiosensitizers and the formation of radical-adducts. Electron spin resonance methods have been used to observe alkyl radicals in liquid hydrocarbon systems during irradiation with ‐MeV electrons. These investigations provide detailed structural, radiation chemical, and kinetic information about a large number of radicals.
Knowles PF, Gibson JF, Pick FM, Bray RC. Electron-spin-resonance evidence for enzymic reduction of oxygen to a free radical, the superoxide ion. Biochem J. Jan; (1)– [PMC free article] Fridovich I. Quantitative aspects of the production of superoxide anion radical by milk xanthine oxidase. electron spin resonance study of the radical anions of substituted cyclooctatetraenes. the effects of jahn-teller distortions and vibronic mixing.
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Evidence is obtained that the sulphate radical anion is formed throughout the pH range employed (1–105) and that it can react with organic compounds in at least three ways: by abstracting a hydrogen atom from saturated carbon, by adding to unsaturated or aromatic carbon, and by removing one electron from carboxylate anions and from certain.
Electron spin resonance study of radical anions derived from substituted ferrocenes ☆ Author links open overlay panel Wayne C. Danen Charles T. West Show moreCited by: 8. An electron spin resonance study of the generation and reactions of borane radical anions in solution and both borane radical anions displace alkyl radicals from alkyl isocyanides, the material has been adapted instead of reproduced from the original RSC publication "Reproduced from" can be substituted with "Adapted from".
Electron spin resonance spectra of transient 1-hydropyridinyl radicals produced by the photoreduction of pyridine substituted in the p-position by the t-butyl, ethyl, phenyl, and nitro groups have been studied in solution at room values of the hyperfine couplings and of g are reported for these radicals and for the 4-nitropyridinyl anion by: Cite this paper as: Davies A.G., Neville A.G.
() An Electron Spin Resonance Study of some Silanone Radical Anions. In: Fischer H., Heimgartner H. (eds) Organic Free : Alwyn G. Davies, Anthony G. Neville. The strong influence of the solvent on the electron spin resonance spectra of semiquinone radical anions I. A theoretical investigation of the hyperfine constants of 1,2- and 1,4-benzosemiquinone by using density functional theory and polarizable continuum solvation models.
Electron spin resonance spectra of seven derivatives of 9,anthrasemiquinone and 1,4-anthrasemiquinone are studied. These radicals have been obtaine. The e.s.r. spectra of the ′-bisphenylsulphonyl--benzoquinone di-imine radical anion, its 2,3- and 2,5-di-chloro-substituted analogues, and the ′-dicyano--benzoquinone di-imine radical anion are reported.
The observation of two sets of equivalent protons in the bisphenylsulphonyl--benzoquinone di. Electron Spin Resonance. Anion radicals generated electrochemically from 29 derivatives of chalcogenophenes were examined by ESR and the results were discussed 〈83JST()〉. An ESR study of radical ions in the 2,5-diphenylselenophene series has been published 〈90JOM()〉.
In the case of 1,4-naphthoquinone, unexpected e.s.r. emission was initially observed by photochemically induced dynamic electron polarization of the semiquinone radicals. Photolysis of anthraquinone in isopropanol gives e.s.r.
spectra of the anthrasemiquinone radical anions. The radical anions of xanthen and several of its derivatives have been prepared by the action of potassium on a solution of the parent compound in dimethoxyethane at –70°.
The e.s.r. spectra of these species are reported and compared with the results of MO calculations. It is suggested that the xanthen radical.
g B-value of this sample is in agreement with g-values in 2-methyl-9,anthrasemiquinone anion, 9,10 J.H. MarshallElectron spin resonance study of the sym-trinitrobenzene anion and M. SimonettaAn electron spin resonance investigation of substituted 3-nitropyridines radical anions. Phys. Chem., 82 (19) (), pp.
Structures and stabilities of the radical anions of substituted benzenes. Journal of the American Chemical SocietyElectron spin resonance study of carbon enriched 1,4-dinitrobenzene anion radical. Electron Spin Resonance Spectrum of the Radical Anion of 1,3‐Butadiene in Liquid Ammonia.
Electron spin resonance spectroscopy is the method used to determine the structure and life expectancy of a number of radicals. Written by Fabian Gerson and Walter Huber, top experts in the field of electron spin resonance spectroscopy, this book offers a compact yet readily comprehensible introduction to the modern world of ESR.
Electron spin resonance study of substituted anthrasemiquinone radical anions. Author: Ahmed, N. ISNI: Awarding Body: University of Salford Current Institution: University of Salford Date of Award: Availability of Full Text.
Electron spin resonance study of some polycyclic nitrogen heterocyclic radical anions. In dimethylformamide the ESR spectra of the radical anions of dibenzo[f,h]quinoxaline and dibenzo[a,c]phenazine both exhibit line broadening due to slow molecular tumbling over a wide temperature range.
Similar effects are also observed in the spectra of. Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) spectroscopy is a method for studying materials with unpaired basic concepts of EPR are analogous to those of nuclear magnetic resonance (NMR), but it is electron spins that are excited instead of the spins of atomic spectroscopy is particularly useful for studying metal complexes or organic radicals.
Electron paramagnetic resonance examination of aqueous anthrasemiquinone radical anion. Journal of Magnetic Resonance ()47 (2) A time resolved photo-CIDEP study of electron transfer in durosemiquinone radicals. Electron spin relaxation in concentrated solutions of a nitroxide radical.
Electron Spin Resonance Spectra of Methyl‐Substituted Dihydropyrazine Cations and Related Radicals. The Journal of Chemical Physics41 (5), DOI: / Donald H. Levy, Rollie J. Myers. Electron Spin Resonance Spectrum of the Radical Anion of 1,3‐Butadiene in Liquid Ammonia.
Electron spin resonance emission was studied from the photochemically produced 1,4-naphthosemi-quinone radical in liquid methanol, ethanol, isopropanol, ethylene glycol, and in acetic acid in the.
An Electron Spin Resonance Study of the Anion Radicals of Some Nitrotropolonates and 2-Methoxynitrotropone. Bulletin of the Chemical Society of Japan48 (1), The electron spin resonance spectra of the ketyl and radical anion of perfluorobenzophenone were generated in alcoholic solution by means of a photochemical method.The electron spin resonance spectrum of the radical anion of 1,3‐butadiene has been observed by means of continuous electrolysis in liquid ammonia.
The proton coupling constants were observed to be A(CH)=± Oe and A(CH 2)=± values give a Q(av)=± source of this low Q value is discussed together with theoretical spin densities.