Abstract
1. In the photoexcitation of diphenoquinone solutions in the visible region in the presence of the corresponding biphenyls semiquinone radicals are formed. The reaction proceeds with the participation of the triplet state of the diphenoquinone. 2. The absorption spectra have been recorded and the extinction coefficients calculated of neutral semiquinone radicals and radical-anions. 3. The EPR spectra of radical-anions represent singlets. The EPR spectrum of the semiquinone radical of tetrachlorodiphenoquinone represents a quintuplet with a binomial ratio of the intensities. 4. Disproportionation of the C1QH− radicals is limited by progressive diffusion. 5. The values of the one-electron redox potentials of the pairs C1Q/C1Q- and BrQ/BrQ-have been determined. The acceptor properties of the quinone molecules are less pronounced in an aqueous organic medium than in the gaseous phase.
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