ESR study of an X-ray-induced nitroxide radical in 3-hydroxyguanine


Single crystals of 3-hydroxyguanine have been X irradiated at 77 K and studied by ESR at 300 K. A nitroxide radical formed by abstraction of a hydrogen at N3 is the primary radical species formed by the radiation. A nitrogen hyperfine tensor with principal values of 1.7, 6.1, and 16 G, and a g tensor with principal values of 2.0013, 2.0062, and 2.0088 have been determined. These results indicate a spin density of 0.23 on N3. Spectra from pairwise-trapped nitroxide radicals were observed at some orientations. © 1986.

Publication Title

Journal of Magnetic Resonance (1969)