Acid-base equilibrium constants and distribution coefficients of aminopyrene between the surface and bulk of liquid water as studied by a laser two-photon ionization technique

Miki Sato, Akira Harata, Yoshihiko Hatano, Teiichiro Ogawa, Takeshi Kaieda, Kohshin Ohmukai, Hirofumi Kawazumi

    研究成果: ジャーナルへの寄稿記事

    2 引用 (Scopus)

    抄録

    The pH-dependent amount of aminopyrene adsorbed at the water surface was measured using a laser two-photon ionization technique. The distribution coefficients of neutral and cationic aminopyrene between the surface and bulk of liquid water were determined to be 9.6 × 10 -6 m and 2.5 × 10 -7 m, respectively, The acid-base equilibrium constant, pK a, of aminopyrene on the water surface was determined to be 2.0, while that of the same molecule in bulk water was 3.6 × 0.1. These results show that neutral aminopyrene tends to stay on the water surface, resulting in equilibrium shifts toward the neutral form. It is demonstrated that laser two-photon ionization is a powerful method to analyze the equilibria of a small amount of molecules, 0.17pmol/cm 2, adsorbed at the water surface.

    元の言語英語
    ページ(範囲)12111-12115
    ページ数5
    ジャーナルJournal of Physical Chemistry B
    108
    発行部数32
    DOI
    出版物ステータス出版済み - 8 12 2004

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    acid base equilibrium
    Equilibrium constants
    surface water
    Ionization
    Photons
    ionization
    Water
    Lasers
    photons
    Liquids
    coefficients
    liquids
    water
    lasers
    guy wires
    molecules
    Molecules
    Acid-Base Equilibrium
    shift

    All Science Journal Classification (ASJC) codes

    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films
    • Materials Chemistry

    これを引用

    Acid-base equilibrium constants and distribution coefficients of aminopyrene between the surface and bulk of liquid water as studied by a laser two-photon ionization technique. / Sato, Miki; Harata, Akira; Hatano, Yoshihiko; Ogawa, Teiichiro; Kaieda, Takeshi; Ohmukai, Kohshin; Kawazumi, Hirofumi.

    :: Journal of Physical Chemistry B, 巻 108, 番号 32, 12.08.2004, p. 12111-12115.

    研究成果: ジャーナルへの寄稿記事

    Sato, Miki ; Harata, Akira ; Hatano, Yoshihiko ; Ogawa, Teiichiro ; Kaieda, Takeshi ; Ohmukai, Kohshin ; Kawazumi, Hirofumi. / Acid-base equilibrium constants and distribution coefficients of aminopyrene between the surface and bulk of liquid water as studied by a laser two-photon ionization technique. :: Journal of Physical Chemistry B. 2004 ; 巻 108, 番号 32. pp. 12111-12115.
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    abstract = "The pH-dependent amount of aminopyrene adsorbed at the water surface was measured using a laser two-photon ionization technique. The distribution coefficients of neutral and cationic aminopyrene between the surface and bulk of liquid water were determined to be 9.6 × 10 -6 m and 2.5 × 10 -7 m, respectively, The acid-base equilibrium constant, pK a, of aminopyrene on the water surface was determined to be 2.0, while that of the same molecule in bulk water was 3.6 × 0.1. These results show that neutral aminopyrene tends to stay on the water surface, resulting in equilibrium shifts toward the neutral form. It is demonstrated that laser two-photon ionization is a powerful method to analyze the equilibria of a small amount of molecules, 0.17pmol/cm 2, adsorbed at the water surface.",
    author = "Miki Sato and Akira Harata and Yoshihiko Hatano and Teiichiro Ogawa and Takeshi Kaieda and Kohshin Ohmukai and Hirofumi Kawazumi",
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    T1 - Acid-base equilibrium constants and distribution coefficients of aminopyrene between the surface and bulk of liquid water as studied by a laser two-photon ionization technique

    AU - Sato, Miki

    AU - Harata, Akira

    AU - Hatano, Yoshihiko

    AU - Ogawa, Teiichiro

    AU - Kaieda, Takeshi

    AU - Ohmukai, Kohshin

    AU - Kawazumi, Hirofumi

    PY - 2004/8/12

    Y1 - 2004/8/12

    N2 - The pH-dependent amount of aminopyrene adsorbed at the water surface was measured using a laser two-photon ionization technique. The distribution coefficients of neutral and cationic aminopyrene between the surface and bulk of liquid water were determined to be 9.6 × 10 -6 m and 2.5 × 10 -7 m, respectively, The acid-base equilibrium constant, pK a, of aminopyrene on the water surface was determined to be 2.0, while that of the same molecule in bulk water was 3.6 × 0.1. These results show that neutral aminopyrene tends to stay on the water surface, resulting in equilibrium shifts toward the neutral form. It is demonstrated that laser two-photon ionization is a powerful method to analyze the equilibria of a small amount of molecules, 0.17pmol/cm 2, adsorbed at the water surface.

    AB - The pH-dependent amount of aminopyrene adsorbed at the water surface was measured using a laser two-photon ionization technique. The distribution coefficients of neutral and cationic aminopyrene between the surface and bulk of liquid water were determined to be 9.6 × 10 -6 m and 2.5 × 10 -7 m, respectively, The acid-base equilibrium constant, pK a, of aminopyrene on the water surface was determined to be 2.0, while that of the same molecule in bulk water was 3.6 × 0.1. These results show that neutral aminopyrene tends to stay on the water surface, resulting in equilibrium shifts toward the neutral form. It is demonstrated that laser two-photon ionization is a powerful method to analyze the equilibria of a small amount of molecules, 0.17pmol/cm 2, adsorbed at the water surface.

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