Kinetic study of boric acid-borate interchange in aqueous solution by 11B NMR spectroscopy

Koji Ishihara, Akira Nagasawa, Kimiko Umemoto, Hideaki Ito, Kazuo Saito

    Research output: Contribution to journalArticle

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    Abstract

    Kinetics of interchange between boric acid and tetrahydroxyborate has been studied by the band shape analysis of 11B NMR signals in aqueous solution of pH 8-10 at 20-52°C and 0.1-250 MPa. The system was analyzed as two-site exchange B(OH)3 ⇌ B(OH)4 -. The observed first-order rate constant toward the right (kX) is related to the second-order exchange rate constant (kex) by the equation kX = kexCT[OH-]/(kb + [OH-] ), where kb = [B(OH)3] - [OH-]/[B(OH)4 -], and CT is the total concentration of boron. Under the given conditions kex is (2-7) × 106 dm3 mol-1 s-1 and ΔH, ΔS, and ΔV are 20.1 ± 1.0 kJ mol-1 -55.0 ± 3.1 J mol-1 K-1, and -9.9 ± 0.5 cm3 mol-1, respectively. The activation parameters reflect the transition state forming dimeric [(OH)3B(μ-OH)B(OH)3]-. The results are compared with those of related reactions.

    Original languageEnglish
    Pages (from-to)3811-3816
    Number of pages6
    JournalInorganic Chemistry
    Volume33
    Issue number17
    Publication statusPublished - 1994

    Fingerprint

    boric acids
    Borates
    Interchanges
    borates
    Nuclear magnetic resonance spectroscopy
    Rate constants
    aqueous solutions
    nuclear magnetic resonance
    Kinetics
    Boron
    kinetics
    spectroscopy
    boron
    Chemical activation
    Nuclear magnetic resonance
    activation
    hydroxide ion
    boric acid

    ASJC Scopus subject areas

    • Inorganic Chemistry

    Cite this

    Ishihara, K., Nagasawa, A., Umemoto, K., Ito, H., & Saito, K. (1994). Kinetic study of boric acid-borate interchange in aqueous solution by 11B NMR spectroscopy. Inorganic Chemistry, 33(17), 3811-3816.

    Kinetic study of boric acid-borate interchange in aqueous solution by 11B NMR spectroscopy. / Ishihara, Koji; Nagasawa, Akira; Umemoto, Kimiko; Ito, Hideaki; Saito, Kazuo.

    In: Inorganic Chemistry, Vol. 33, No. 17, 1994, p. 3811-3816.

    Research output: Contribution to journalArticle

    Ishihara, K, Nagasawa, A, Umemoto, K, Ito, H & Saito, K 1994, 'Kinetic study of boric acid-borate interchange in aqueous solution by 11B NMR spectroscopy', Inorganic Chemistry, vol. 33, no. 17, pp. 3811-3816.
    Ishihara, Koji ; Nagasawa, Akira ; Umemoto, Kimiko ; Ito, Hideaki ; Saito, Kazuo. / Kinetic study of boric acid-borate interchange in aqueous solution by 11B NMR spectroscopy. In: Inorganic Chemistry. 1994 ; Vol. 33, No. 17. pp. 3811-3816.
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