Two elusive radical intermediates; a methyl radical (·CH3) and a carboxymethyl radical (·CH2CO2H), have been confirmed for the first time by direct observation of their ESR absorptions at room temperature on the photocatalytic reactions of acetic acid and metal (platinum)-loaded titanium dioxide (Pt/TiO2) in aqueous solution.
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Kaise et al. (1993) studied this question.
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