Spectrophotometric Study on the Extraction of Magnesium(II)–8-Hydroxyquinoline-5-sulfonic Acid Chelate Anion with Zephiramine
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概要
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The ion-pair of magnesium(II)–8-hydroxyquinoline-5-sulfonic acid chelate anion with zephiramine (Z<SUP>+</SUP>Cl<SUP>−</SUP>) 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 6.73×10<SUP>3</SUP> cm<SUP>−1</SUP> mol<SUP>−1</SUP>1. The composition of the ternary complex is estimated to be [Mg<SUP>2+</SUP>(QS<SUP>2−</SUP>Z<SUP>+</SUP>)<SUB>2</SUB>(HQS<SUP>−</SUP>Z<SUP>+</SUP>)]<SUB>o</SUB>. The extraction equilibrium is given by<BR>Mg^2++3[(HQS^-Z^+)]_o+2OH^-\rightleftharpoons[Mg^2+(QS^2-Z^+)_2(HQS^-Z^+)]_o+2H_2O<BR>where QS denotes 8-hydroxyquinoline-5-sulfonic acid and o the organic phase. The equilibrium constant <I>K</I> is given by log<I>K</I>=16.95±0.13.
- 公益社団法人 日本化学会の論文
著者
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Sugawara Masao
Department Of Chemistry College Of Humanities And Sciences Nihon University
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Kambara Tomihito
Department Of Chemistry Faculty Of Science Hokkaido University
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