ESR spectrum of p-dibenzylbenzene anion-radical

Conclusions The delocalization frequencies of the unpaired electron were determined, both between the adjacent and the separated benzene nuclei in the p-dibenzylbenzene anion-radical.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 469–471, February, 1974.     

ESR spectrum of the cyclopropenyl radical

The ESR spectrum of a radical produced by photolytically generated t-butoxy radicals and cyclopropene in solution is reported. Arguments are presented for an assignment of the spectrum to the cyclopropenyl radical (CH)₃ undergoing fast exchange between equivalent distorted r_e structures.     

The ESR spectrum of arsenic tetrafluoride

The ESR spectrum of AsF₄, generated by γ-radiolysis of a solid solution of AsF₃ in SF₆, is reported. The ⁷⁵As hyperfine interaction is 1576 G, and the two kinds of ¹⁹F nuclei have interactions of 49 G (equatorial) and 238 G (apical). These data are compared with those from the well-known PF₄ radical.     

ESR spectrum of γ-irradiated adamantane

It has been shown that the ESR spectrum observed after γ irradiation of solid adamantane is not due to 1 and 2 adamantyl radicals but to a substituted 1 methyl cyclohexyl radical resulting from a C  C bond rupture. The reversible thermal changes of the spectrum show that the cyclohexyl ring inter-converts between its two stable configurations with a temperature dependent rate.     

The ESR spectrum of the cis-stilbene radical anion

The ESR spectrum of the cis-stilbene radical anion has been observed under conditions where its conversion into the trans isomer is relatively slow. Assignment of the proton coupling constants has been based on studies on the 4,4′- and 7,7′- dideuterio derivatives, as well as on comparison with structurally related species. The values for the radical anions of cis- and trans-stilbene are very similar, except those (2.68 and 4.49 G, respectively) arising from protons in the 7,7′-positions. The difference is attributed to strong distortions of the π-system in the C1C7′C1′ fragment of the cis isomer.     

ESR spectrum of the oxidized vanadylporphyrin complex of Karazhanbass petroleum

As a result of the use of various oxidants, mono- and bications of the natural vanadylporphyrins of Karazhanbass petroleum have been obtained, and their ESR spectra have been studied.Institute of the Chemistry of Petroleum and Natural Salts of the Kazakh SSR Academy of Sciences, Gur'ev. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 190–193, March–April, 1990.     

Tetrakis(trifluoromethyl)ethylene anion-radical

Conclusions The reversible one-electron reduction of an isolated C =C double bond to give a stable anion-radical was observed for the first time on the example of tetrakis(trifluoromethyl)ethylene.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 482–484, February, 1978.     

Primary photochemical processes of tetraphenylmethane solids

Studies of UV irradiatated tetraphenylmethane crystals by electron paramagnetic resonance and electronic optical spectroscopy are presented. The primary processes of photochemical reactions are proposed as: (1) (C₆H₅)₄C + hv → (C₆H₅)₃C· + C₆H₅· and (2) 2C₆H₅· → C₆H₅C₆H₅. No similar effect occurs with other tetrapheny compounds, triphenylmethane, or diphenylmethane. The steric strain in Ph₄C and effective resonance in Ph₃C· may be responsible for the high q of the above photochemical reactions.     

硝基苯阴离子基的ESR谱的研究

本文研究了在不同PH值的水溶液中电化学还原产生的硝基苯阴离子基的ESR谱, 随PH值下降, 硝基苯阴离子基的ESR谱由54条线变为36条线, 这种变化主要是硝基苯分子与其阴离子基之间电子交换速度增大, ESR谱线增宽, 谱分辨率下降造成的, 谱的理论模拟也证明了这一点, 交换速度常数在强碱介质中约为3.3×10^6s^-^1.mol^-^1.dm^3。     

Kinetics of the reaction of superoxide anion-radical with olefins

Kinetic investigation of the reaction of electrochemically generated with perfluorooctene, styrene, and cyclohexene in acetonitrile, in the presence of tetraethylammonium perchlorate used as a background electrolyte, revealed that reacts with styrene and perfluorooctene at the double bond, and the reactivity of the olefins with respect to decreases with decrease in the electrophilicity of the substituents at the double bond: perfluorooctene > styrene > cyclohexene. The main transformation products of styrene are phthalic and benzoic acid esters.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 733–737, April, 1990.The authors thank V. B. Bol'evoi for his contribution to the discussion of the results obtained.     

Conformational effect in the ESR spectrum of cyclohexyl radicals in adamantane matrix

Cyclohexyl radicals have been produced by λ-irradiation of cyclohexane incorporated in an adamantane matrix. ESR spectra of both rigid and inverting radicals have been observed.