ESR and quantum chemical studies of the structures and thermal transformations of the radical cations of vinylcyclopropane in irradiated frozen Freon matrices. Simulation of radical processes in solids |
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| Authors: | I. Yu. Shchapin V. I. Fel'dman V. N. Belevskii N. A. Donskaya N. D. Chuvylkin |
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| Affiliation: | (1) L. Ya. Karpov Scientific Research Physico-Chemical Institute, 10 ul. Obukha, 103064 Moscow, Russian Federation;(2) Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory, 119899 Moscow, Russian Federation;(3) N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 117913 Moscow, Russian Federation |
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| Abstract: | Thermal transformations of vinylcyclopropane radical cations (VCP.+) in X-ray-irradiated frozen Freon matrices (CFCl2CF2Cl and CFCl3) were studied by ESR; radical processes involving VCP.+ in solid VCP were simulated.Gauche- andanti-VCP.+ were found to be the primary radical cations, however, the former, unlike the latter, is stable only under  gas-phase conditions. The thermodynamic equilibrium betweenanti-VCP.+ and its less stable distonic form,dist(90,0)-C5H8.+, is established in frozen Freon matrices and the VCP host matrix; the structure of dist(90,0)****-C5H8.+ is stabilized by a molecule ofanti-VCP. In CFC3, along with dist(90,0)-C5H8.+, -dimeric resonance [anti-VCP]2.+ complex was detected. A general scheme of the transformations of VCP.+ in the solid phase has been proposed.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 11–21, January, 1994. |
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| Keywords: | radiolysis, Freon matrices vinylcyclopropane, primary radical cations, distonic radical cation, dimeric radical cation thermal rearrangement solid phase ESR quantum chemical analysis |
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