ESR studies of radicals present during the photolysis of solutions of 2,6-pyridinedicarboxylic acid and its anions in solutions near room temperature are reported. Spectra were found for four radicals resulting from reduction of the parent compounds. Radicals I, II, and III, respectively, result from hydrogen atom attachment to the nitrogen atom of the parent dicarboxylic acid, its monoanion, and its dianion. Radical IV results from hydrogen atom attachment to a carbon atom meta to the nitrogen of the dianion. Conditions and mechanisms of formation are discussed, and g values and absolute values of hyperfine couplings are reported.

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