Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Spectrophotometric Study on the Extraction of Magnesium(II)–8-Hydroxyquinoline-5-sulfonic Acid Chelate Anion with Zephiramine
Masao SugawaraTomihito Kambara
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1973 Volume 46 Issue 12 Pages 3789-3791


The ion-pair of magnesium(II)–8-hydroxyquinoline-5-sulfonic acid chelate anion with zephiramine (Z+Cl) was extracted into chloroform. The ternary complex has an absorption maximum at 390 nm in the organic layer. The optimum pH range for the extraction is 10.1–11.4. For the first extract, Beer’s law holds for 4.6–20.6 μg of magnesium(II) in 10-ml organic layer, the molar absorptivity being 6.73×103 cm−1 mol−11. The composition of the ternary complex is estimated to be [Mg2+(QS2−Z+)2(HQSZ+)]o. The extraction equilibrium is given by
Mg^2++3[(HQS^-Z^+)]_o+2OH^-\ ightleftharpoons[Mg^2+(QS^2-Z^+)_2(HQS^-Z^+)]_o+2H_2O
where QS denotes 8-hydroxyquinoline-5-sulfonic acid and o the organic phase. The equilibrium constant K is given by logK=16.95±0.13.

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