Abstract
An equilibrium conformation of the perfluoroalkyl ∼CF2·CF2 radical at 77 K in matrices of polytetrafluoroethylene andn-perfluoroalkanes was studied. Upon cooling from 300 to 77 K at temperatures below 200 K, the ESR spectrum of this radical changes, and the well-resolved hyperfine structure appears. The hyperfine splitting constants on nuclei of two nonequivalent Fβ atoms were determined: 2.2 and 1.1 mT, respectively. TheA ∥ andA ⊥ values for the Fα atoms are 22.5 and 3.3 mT, respectively. The conformational angle between the axis of the orbital of an unpaired electron and projection of the Cβ−Cγ bond is 5.6°.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 331–334, February, 1999.
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Allayarov, S.R., Mikhailov, A.I., Mel'nikov, V.P. et al. Conformation of perfluoroalkyl radicals in the solid phase. Russ Chem Bull 48, 330–333 (1999). https://doi.org/10.1007/BF02494558
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DOI: https://doi.org/10.1007/BF02494558