Reactivity of H atoms and hydrated electrons with chlorobenzoic acids

R. Zona, S. Solar, N. Getoff, Knud Sehested, Jerzy Holcman

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    H radicals react with chlorobenzoic acids and chlorobenzene (k(H-center dot + substrates) = (0.7-1.5) x 10(9) dm(3) Mol(-1) s(-1)) by addition to the benzene ring forming H adducts with characteristic absorption bands in the range of 310-360 nm. The rate constants for their second-order decay are 2k = (3.5-6) x 10(8) dm(3) Mol(-1) S-1. By reduction with e(-)(aq) fragmentation and chloride release was established for 2- and 4-chlorobenzoic acid, for 3-chlorobenzoic acid the addition of electrons to the carboxylate group was observed by pulse radiolysis. By gamma radiolysis could be proved that these radical anions undergo intramolecular electron transfer and quantitave dechlorination. The efficiency in degradation was 4-chlorobenzoic acid > 3-chlorobenzoic acid > 2-chlorobenzoic acid. Benzoic acid was found as final product for all substrates.
    Original languageEnglish
    JournalRadiation Physics and Chemistry
    Volume77
    Issue number2
    Pages (from-to)162-168
    ISSN0969-806X
    DOIs
    Publication statusPublished - 2008

    Keywords

    • ionizing radiation
    • chlorobenzoic acids
    • pulse radiolysis
    • gamma radiolysis
    • chloride formation

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