Substituent effects in the one-electron reduction of anthraquinone derivatives |
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Authors: | A. I. Brodskii L. L. Gordienko |
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Affiliation: | (1) Pisarzhevskii Institute of Physical Chemistry, AS UkrSSR, Kiev |
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Abstract: | Polarographic reduction against (C2H5)4NBr as background in dimenthyformamide has been applied to 17 anthraquinones with - and -substituents. There are two pronounced half-waves, which correspond to two one-electron degrees of reduction, a semiquinone anion being formed as intermediate. An ESR signal is produced when this radical is formed by electrolysis with a cathode potential equal to E1/2. The observed E1/2 fit Hammett's equation closely. The relation E1/2 to donor-acceptor aspects of the substituents is discussed. |
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