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    Borate complexes of benzohydroxamic acid and some of its derivatives

    Date
    1966-07-01
    Author
    Fields, Alan R.
    Daye, Barbara M.
    Christian, Robert
    Metadata
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    Citation
    Talanta. 1966 Jul; 13(7): 929-37.
    Abstract
    Ultraviolet spectrophotometric measurements in dilute aqueous solution give pK(a) values of 8.78, 8.27, 8.96 and 8.68, respectively, for benzohydroxamic, N-phenylbenzohydroxamic, p-methoxybenzohydroxamic and N-methyl-p-methoxybenzohydroxamic acids. The acids carrying no substituent on nitrogen form 1:1 complexes with boric acid according to the general equation RCONHOH + H(3)BO(3) --> (1:1 complex)(-) + H(+). Equilibrium constants (log K) were found to be -5.70 for benzohydroxamic acid and -5.8 for p-methoxybenzohydroxamic acid. The complexes behave as very weak monoprotic acids and decompose at high pH to yield borate ions and the corresponding hydroxamate ions. The N-substituted hydroxamic acids showed no reaction with boric acid under the same conditions.
    Description
    Full text of this article is not available in SOAR.
    URI
    http://hdl.handle.net/10057/4336
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