ESR studies on the formation of p‐benzosemiquinone anions over manganese dioxide

Shun‐Ichi ‐I Fukuzumi, Yoshio Ono, Tominaga Keii

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12 Scopus citations

Abstract

The reaction between a hydroquinone aqueous solution and manganese dioxide has been investigated by electron paramagnetic resonance spectroscopy. A very stable p‐benzosemiquinone anion is formed when an aqueous solution of hydroquinone is passed through a column of manganese dioxide. The kinetics for the reaction between hydroquinone and manganese dioxide follow the equation (Formula Presented.) where A0 is the initial concentration of hydroquinone, C is the concentration of p‐benzosemiquinone anions, W is the amount of manganese dioxide, F is the feed rate of a hydroquinone aqueous solution, and k10 and k20 are constants; k10 = 3.1 × 10−2 (cm3/g MnO2· min), k20 = 3.2 (cm3/g MnO2·min). A mechanism for the reaction is proposed such that Mn(IV) in manganese dioxide is reduced to MnII with hydroquinone from which the semiquinone anion is formed via a neutral semiquinone. The formation of semiquinone anions from several substituted hydroquinones is also discussed.

Original languageEnglish
Pages (from-to)535-546
Number of pages12
JournalInternational Journal of Chemical Kinetics
Volume7
Issue number4
DOIs
StatePublished - Jul 1975

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