The Chelating Behavior of 1-(2-Phosphonophenylazo)-2-hydroxynaphthalene-3,6-disulfonic Acid with Alkaline Earth Metals
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概要
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A new chelating agent, <I>o</I>-phosphonophenylazo-2-hydroxynaphthalene-3,6-disulfonic acid, has been synthesized. The acid dissociation constants of this ligand and the chelate stability constants with alkaline earth metals have been measured by the pH titration method at an ionic strengh of 0.10 and at 25.0±0.1°C. This ligand forms the acido complex, MHL, in the pH 5–7 region. The stability constants of the acido complex decrease in this order: log <I>K</I><SUB>SrHL</SUB>≈log<I>K</I><SUB>CaHL</SUB>>log <I>K</I><SUB>MgHL</SUB>; whereas the decreasing order of the stability constants, log<I>K</I><SUB>ML</SUB>, is as follows: log <I>K</I><SUB>MgL</SUB>>log <I>K</I><SUB>CaL</SUB>>log <I>K</I><SUB>SrL</SUB>.
- 公益社団法人 日本化学会の論文
著者
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Miyata Haruo
Department Of Cardiology Hamamatsu Medical Cente
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Tôei Kyoji
Department of Chemistry, Faculty of Science, Okayama University
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Kina Kenyu
Department of Chemistry, Faculty of Science, Okayama University
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