A Spectrophotometric Study of the Thorium Complex of 2-(1, 8-Dihydroxy-3, 6-disulfo-2-naphthylazo)-phenoxyacetic Acid
- 1 August 1967
- journal article
- research article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 40 (8) , 1875-1878
- https://doi.org/10.1246/bcsj.40.1875
Abstract
2-(1, 8-Dihydroxy-3, 6-disulfo-2-naphthylazo)-phcnoxyacetic acid has been synthesized. The acid dissociation constants of the reagent have been determined spectrophotometrically at 25 °C and at an ionic strength of 0.1. The reagent forms a violet 1 : 1 complex with thorium, showing an absorption maximum at 575 mμ in an acidic solution. The apparent stability constant of the thorium complex was measured over the pH range from 1 to 3.5.Keywords
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