Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Chelating Behavior of 1-(2-Phosphonophenylazo)-2-hydroxynaphthalene-3,6-disulfonic Acid with Alkaline Earth Metals
Kenyu KinaHaruo MiyataKyoji Tôei
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1971 Volume 44 Issue 10 Pages 2710-2712

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Abstract

A new chelating agent, o-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 KSrHL≈logKCaHL>log KMgHL; whereas the decreasing order of the stability constants, logKML, is as follows: log KMgL>log KCaL>log KSrL.

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