Kinetic study of the complex formation of boric and boronic acids with mono- and diprotonated ligands

Hideaki Ito, Yoko Kono, Akinori Machida, Yoko Mitsumoto, Kenji Omori, Noriko Nakamura, Yuichi Kondo, Koji Ishihara

    Research output: Contribution to journalArticle

    32 Citations (Scopus)

    Abstract

    The complex formation reactions of boric and boronic acids (RB(OH)2: R=OH, n-Bu, Ph, and m-NO2Ph) with 4-isopropyltropolone (Hipt) and chromotropic acid (H2cht2-) have been studied kinetically at various pH. The reactions of H2ipt+ with boronic acids were faster than those of Hipt by a factor of 1.5-11, and fully deprotonated ipt- also reacted with m-NO2PhB(OH)2, but slower than Hipt. The tetrahedral m-NO2PhB(OH)3 - ion did not react with Hipt. Reaction routes for the complexation of boric acid with chromotropic acid could not be specified because of the unexpected problem of proton ambiguity. Mechanism for the reactions of boronic acids with bidentate ligands was discussed in terms of rate determining chelate ring closure. It was concluded that at least one proton is necessary for the OH- in the tetrahedral intermediates to be eliminated smoothly as water, and a doubly hydrogen-bonded intermediate was proposed for the reactions with diprotic ligands.

    Original languageEnglish
    Pages (from-to)28-36
    Number of pages9
    JournalInorganica Chimica Acta
    Volume344
    DOIs
    Publication statusPublished - 2003 Feb 20

    Fingerprint

    Boric Acids
    Boronic Acids
    boric acids
    Protons
    Ligands
    ligands
    acids
    Kinetics
    Acids
    kinetics
    Hydrogen
    Ions
    Complexation
    Water
    Boric acid
    protons
    chelates
    ambiguity
    closures
    routes

    Keywords

    • Boric acid
    • Boronic acid
    • Complex formation kinetics

    ASJC Scopus subject areas

    • Biochemistry
    • Inorganic Chemistry
    • Physical and Theoretical Chemistry
    • Materials Chemistry

    Cite this

    Kinetic study of the complex formation of boric and boronic acids with mono- and diprotonated ligands. / Ito, Hideaki; Kono, Yoko; Machida, Akinori; Mitsumoto, Yoko; Omori, Kenji; Nakamura, Noriko; Kondo, Yuichi; Ishihara, Koji.

    In: Inorganica Chimica Acta, Vol. 344, 20.02.2003, p. 28-36.

    Research output: Contribution to journalArticle

    Ito, Hideaki ; Kono, Yoko ; Machida, Akinori ; Mitsumoto, Yoko ; Omori, Kenji ; Nakamura, Noriko ; Kondo, Yuichi ; Ishihara, Koji. / Kinetic study of the complex formation of boric and boronic acids with mono- and diprotonated ligands. In: Inorganica Chimica Acta. 2003 ; Vol. 344. pp. 28-36.
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    AU - Omori, Kenji

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    AU - Kondo, Yuichi

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