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Double electron-electron resonance in electron spin echo: Conformations of spin-labeled poly-4-vinilpyridine in glassy solutions

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Abstract

Double electron-electron resonance in electron spin echo has been used to study the glassy solutions of poly-4-vinylpyridine doped by nitroxyl radicals frozen in liquid nitrogen. The phase relaxation of spin labels due to spin-spin interaction of unpaired electrons has been studied. The intramolecular and intermolecular contributions of the dipole-dipole interaction of spin labels into relaxation process have been separated. It has been established that both the intramolecular and intermolecular spin-spin interaction of spin labels lead to the dependence of echo signal on timeT of the exp (−aT q) type. It is shown that for the intramolecular interaction the experimentalq value is 0.3, for the intermolecular one it is 2. The assumption has been made of the linear structure of polymeric molecules due to the presence of a sufficiently high density of an electric charge on polymeric molecules.

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Authors and Affiliations

  1. Institute of Chemical Kinetics and Combustion, Siberian Division of the Russian Academy of Science, Institutskaya Str. 3, 630090, Novosibirsk, Russian Federation

    A. D. Milov & Yu. D. Tsvetkov

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  1. A. D. Milov
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  2. Yu. D. Tsvetkov
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Milov, A.D., Tsvetkov, Y.D. Double electron-electron resonance in electron spin echo: Conformations of spin-labeled poly-4-vinilpyridine in glassy solutions. Appl. Magn. Reson. 12, 495–504 (1997). https://doi.org/10.1007/BF03164129

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  • DOI: https://doi.org/10.1007/BF03164129

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