Binding of 4-aminoazobenzene derivatives by sodium salt of .BETA.-naphthalenesulfonic acid-formaldehyde condensates - An interpretation of the binding equilibria by an ion-exchange mechanism.

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Other Title
  • β-ナフタレンスルホン酸-ホルマリン縮合物ナトリウム塩に対する4-アミノアゾベンゼン誘導体の結合-イオン交換機構による結合平衡の説明
  • β-ナフタレンスルホン酸-ホルマリン縮合物ナトリウム塩に対する4-アミノアゾベンゼン誘導体の結合--イオン交換機構による結合平衡の説明〔英文〕
  • ベータ ナフタレンスルホンサン ホルマリン シュクゴウブツ ナトリウムエン ニ

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Description

Effects of the concentrations of sodium and hydrogen ions on the binding equilibria of 4-aminoazobenzene derivatives (model azo disperse dyes) by sodium salts of β-naphthalenesulfonic acid-formaldehyde condensates (βNSF) in water were determined spectrophotometrically; a βNSF with degree of condensation, N=40, was used. The detailed analysis of the results indicates that the binding of dye by the βNSF of a compact conformation is successfully described by an ion-exchange mechanism. At first, a trace amount of hydrogen ion in the solution is attached to the β-azo nitrogen of the dyes, then the protonated dye (DH) competes with sodium (Na) and hydrogen (H) ions for the dyeing sites in the βNSF, -SO3- The values of ion-exchange constants determined in the pH ranges of 4.126-4.9505 and 5.010-5.508 at 25°C were KHDH=0.14-0.60 and KNaDH-3.8-9.2×10-4, respectively. The values of KHDH, obtained indicate the fact that the sulfonic acid group in the βNSF of a compact conformation behaves as a weak acid.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 44 (6), 296-302, 1988

    The Society of Fiber Science and Technology, Japan

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