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    Successive addition of electrons to sodium quinizarin-2- and -6-sulphonate in aqueous solution. a pulse and -radiolysis study

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    Authors
    Mukherjee, Tulsi
    Land, Edward J
    Swallow, A John
    Guyan, P M
    Bruce, J M
    Issue Date
    1988
    
    Metadata
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    Abstract
    Absorption characteristics of the semiquinone free radicals formed by one-electron reduction of quinizarin 2- and 6-sulphonates (Q2S and Q6S, respectively) have been studied. Second-order rate constants have been determined for the reactions of e, CO, H˙ and O with the two quinones and also for the reaction of the semiquinones with O2 and with themselves. The one-electron reduction potentials (vs. NHE) are E=–270 mV for Q2S and –249 mV for Q6S. They vary with pH in accordance with the pKa values of the parent and the semiquinone. The radicals are stable within the pH range 5–11. The stability constant is highest at pH 8.5, viz. ca. 1.45 for Q2S and 0.95 for Q6S. The one-electron reduction potentials of the semiquinones and the two electron reduction potentials of the quinones can be calculated to be E=–246 mV for Q2S and –213 mV for Q6S, and E=–258 mV for Q2S and –231 mV for Q6S. The variation of these quantities with pH has been related to pKa values for the relevant species. Properties of the radiolytically prepared fully reduced Q2S and Q6S are reported. Their acid forms are stable to oxygen. Adjustment to alkaline pH results in a loss of the sulphonate group from fully reduced Q2S but not from fully reduced Q6S. Reasons are given.
    Citation
    Successive addition of electrons to sodium quinizarin-2- and 6-sulphonate in aqueous solution. a pulse and ?-radiolysis study 1988, 84 (8):2855 Journal of the Chemical Society, Faraday Transactions 1
    Journal
    Journal of the Chemical Society, Faraday Transactions 1
    URI
    http://hdl.handle.net/10541/114361
    DOI
    10.1039/f19888402855
    Additional Links
    http://xlink.rsc.org/?DOI=f19888402855
    Type
    Article
    Language
    en
    ISSN
    0300-9589
    ae974a485f413a2113503eed53cd6c53
    10.1039/f19888402855
    Scopus Count
    Collections
    All Paterson Institute for Cancer Research

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