Abstract
Several crystalline N9-substituted adenine derivatives which had been selectively deuterated at C8 or at easily-exchangeable positions were exposed to hydrogen or deuterium atoms or to γ-rays. The resulting free radicals were studied by electron spin resonance spectroscopy. The radical formed by hydrogen addition on C8 was always observed. In certain cases, the radical formed by hydrogen addition on C2 was also present, but at a lower concentration. The source of hydrogen atoms in the γ-irradiation experiments appears to depend upon the molecular environment as determined by the crystal structure, and in one adenine derivative the source is different for the C8 and C2 hydrogen-addition radicals.
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