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Single crystals of anhydrous thymine (T), thymine monohydrate (T · H 2 O), 5,6-dihydrothymine (TH 2 ), 1-methylthymine (mT) and thymidine (dT) were irradiated with X-rays and UV between 77 K and 300 K. Six types of radicals were analyzed by ESR-spectroscopy at 9.5 GHz and 35 GHz after exposure to X-rays. The anion radical occurred only in T · H 2 O at 77 K, the 4-yl radical only in TH 2  at 77 K and the 1-yl radical only in T between 77 K and 300 K. The 6-yl radical was found in T, TH 2  and mT. It was converted into the 5-yl radical irreversibly by heat or white light (λ &lt; 600 nm). The 5-yl radical appeared in all compounds at room temperature. The highest thermal stability was found for the 7-yl radical which was present at room temperature in all compounds except TH 2 .

Radicals Produced in Single Crystals of Thymine Derivatives by UV and X-Rays