Abstract
Conditions for the formation of peroxyl radicals photosensitized by near-UV irradiation in frozen aqueous solutions of adenine containing 0.1 M NaCl (pH 4–7) are studied. Analysis of the EPR spectra shows that the systems under study contain two types of peroxyl radicals presumably classified earlier as O2−· and HO2··. The effect of freezing methods on the production of the radicals is shown. The signal from O2−· predominates in the spectra of samples with open surfaces and is likely due to the reduction of adsorbed O2 molecules with photoejected electrons. The signal from HO2· could be due to photoinduced interaction between the sensitizer and solvent. Possible mechanisms of these processes are considered.
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