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Electrochemical behavior of p-benzoquinone, 2,3,5,6-tetrachloroquinone and 1,4-naphthoquinone in chloroform—I. In the absence of proton donors

✍ Scribed by S.M. Golabi; M.H. Pournaghi

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
579 KB
Volume
32
Category
Article
ISSN
0013-4686

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✦ Synopsis

The electrochemical behavior of p-benzoquinone (I), 2,3,5,6-tetrachloroquinone (II) and 1,4naphthoquinone (III) has been studied in chloroform using TBAPC 0.50 M as supporting electrolyte. In the absence of proton donors, all of these compounds exhibit two one-electron reversible waves due to a reversible charge transfer without a coupled chemical reaction. The cathodically generated semiquinone of I and III can easily react with the constituents of solutions and be converted to a non-ekctroreducible species, whereas the semiquinone of II is stable. The dianion formed from the reduction of I at hmde can participate in a fast chemical electron transfer reaction with the reduction product of the solvent and be converted to free radical again. Such a phenomena has been observed for III only in low scan rates, but never for II.

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