Reaction volume for the reaction of the hexaaquairon(III) ion with 4-isopropyltropolone in acidic aqueous solution

Masahiro Takagi, Koji Ishihara

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The reaction volumes for the protonation of 4-isopropyltropolone (Hipt)(ΔVH°: Hipt+H+ ⇌ H2ipt+) ) and for the reaction of the Fe(III) ion with Hipt(ΔVFeL°: Fe3+ + Hipt ⇌ Fe(ipt)2+ + H+) have been determined spectrophotometrically in acidic aqueous media under pressure up to 250 MPa. The obtained values are: ΔVH° (cm3 mol-1) =+2.8±0.1, ΔVFeL° (cm3 mol-1)=7.8±0.1. The activation volume for the dissociation of Fe(ipt)2+ was calculated to be -16.5±0.9 cm3 mol-1 by using ΔVFeL° and the reported activation volume for the formation of Fe(ipt)2+. The negative volume of activation for the dissociation reaction confirms associative activation for the reaction of the Fe3+ ion.

    Original languageEnglish
    Pages (from-to)157-160
    Number of pages4
    JournalInorganica Chimica Acta
    Volume232
    Issue number1-2
    DOIs
    Publication statusPublished - 1995

    Fingerprint

    Chemical activation
    activation
    Ions
    aqueous solutions
    ions
    dissociation
    Protonation
    beta-thujaplicin

    Keywords

    • Activation volume
    • Iron complexes
    • Reaction volume
    • Tropolone complexes

    ASJC Scopus subject areas

    • Inorganic Chemistry
    • Physical and Theoretical Chemistry
    • Materials Chemistry

    Cite this

    Reaction volume for the reaction of the hexaaquairon(III) ion with 4-isopropyltropolone in acidic aqueous solution. / Takagi, Masahiro; Ishihara, Koji.

    In: Inorganica Chimica Acta, Vol. 232, No. 1-2, 1995, p. 157-160.

    Research output: Contribution to journalArticle

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    title = "Reaction volume for the reaction of the hexaaquairon(III) ion with 4-isopropyltropolone in acidic aqueous solution",
    abstract = "The reaction volumes for the protonation of 4-isopropyltropolone (Hipt)(ΔVH°: Hipt+H+ ⇌ H2ipt+) ) and for the reaction of the Fe(III) ion with Hipt(ΔVFeL°: Fe3+ + Hipt ⇌ Fe(ipt)2+ + H+) have been determined spectrophotometrically in acidic aqueous media under pressure up to 250 MPa. The obtained values are: ΔVH° (cm3 mol-1) =+2.8±0.1, ΔVFeL° (cm3 mol-1)=7.8±0.1. The activation volume for the dissociation of Fe(ipt)2+ was calculated to be -16.5±0.9 cm3 mol-1 by using ΔVFeL° and the reported activation volume for the formation of Fe(ipt)2+. The negative volume of activation for the dissociation reaction confirms associative activation for the reaction of the Fe3+ ion.",
    keywords = "Activation volume, Iron complexes, Reaction volume, Tropolone complexes",
    author = "Masahiro Takagi and Koji Ishihara",
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    AU - Takagi, Masahiro

    AU - Ishihara, Koji

    PY - 1995

    Y1 - 1995

    N2 - The reaction volumes for the protonation of 4-isopropyltropolone (Hipt)(ΔVH°: Hipt+H+ ⇌ H2ipt+) ) and for the reaction of the Fe(III) ion with Hipt(ΔVFeL°: Fe3+ + Hipt ⇌ Fe(ipt)2+ + H+) have been determined spectrophotometrically in acidic aqueous media under pressure up to 250 MPa. The obtained values are: ΔVH° (cm3 mol-1) =+2.8±0.1, ΔVFeL° (cm3 mol-1)=7.8±0.1. The activation volume for the dissociation of Fe(ipt)2+ was calculated to be -16.5±0.9 cm3 mol-1 by using ΔVFeL° and the reported activation volume for the formation of Fe(ipt)2+. The negative volume of activation for the dissociation reaction confirms associative activation for the reaction of the Fe3+ ion.

    AB - The reaction volumes for the protonation of 4-isopropyltropolone (Hipt)(ΔVH°: Hipt+H+ ⇌ H2ipt+) ) and for the reaction of the Fe(III) ion with Hipt(ΔVFeL°: Fe3+ + Hipt ⇌ Fe(ipt)2+ + H+) have been determined spectrophotometrically in acidic aqueous media under pressure up to 250 MPa. The obtained values are: ΔVH° (cm3 mol-1) =+2.8±0.1, ΔVFeL° (cm3 mol-1)=7.8±0.1. The activation volume for the dissociation of Fe(ipt)2+ was calculated to be -16.5±0.9 cm3 mol-1 by using ΔVFeL° and the reported activation volume for the formation of Fe(ipt)2+. The negative volume of activation for the dissociation reaction confirms associative activation for the reaction of the Fe3+ ion.

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    KW - Reaction volume

    KW - Tropolone complexes

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