Free Radicals in Pyrimidines: 5-thymyl Radical Nitrogen Splitting in Irradiated Thymidine

Ragnar Bergene Institute of Physics, Department of Biophysics, University of Oslo, Blindern, Oslo 3, Norway

Tor Hjalmar Johannessen Institute of Physics, Department of Biophysics, University of Oslo, Blindern, Oslo 3, Norway

Thormod Henriksen Institute of Physics, Department of Biophysics, University of Oslo, Blindern, Oslo 3, Norway

Summary

Single crystals of thymidine irradiated with 4·0 MeV electrons exhibit the well-known eight-line e.s.r. spectrum due to the 5-thymyl radical. A careful analysis of these lines revealed an extra hyperfine splitting, which by a combination of INDO-MO calculations and experiments, was attributed to an interaction between the unpaired electron and the N3-H group.

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Free Radicals in Pyrimidines: 5-thymyl Radical Nitrogen Splitting in Irradiated Thymidine

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Free Radicals in Pyrimidines: 5-thymyl Radical Nitrogen Splitting in Irradiated Thymidine

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