On the extractability of univalent cation as dibenzo-18-crown-6 complexes with picrate ion.
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概要
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The solvent extractions of alkali metal(I) with dibenzo-18-crown-6 (the nomenclature recommended by IUPAC is 2,3,1l,12-dibenzo-1,4,7,10,13,16-hexaoxacyclooctadeca-2,11-diene) as the picrate into chloroform and benzene were studied at 25°C and compared with those of other univalent ions. The extraction constants of the metal ions (<I>K</I><SUB>ex0</SUB>=[ME<SUP>+</SUP>A<SUP>−</SUP>]<SUB>org</SUB>[M<SUP>+</SUP>]<SUP>−1</SUP>[E]<SUB>org</SUB><SUP>−1</SUP>[A<SUP>−</SUP>]<SUP>−1</SUP>), are in the sequence of Tl<SUP>+</SUP>\simeqK<SUP>+</SUP>>Rb<SUP>+</SUP>>NH<SUB>4</SUB><SUP>+</SUP>≥Ag<SUP>+</SUP>>Cs<SUP>+</SUP>>Na<SUP>+</SUP>, but the extraction constants of the metal complexes (K<SUB>ex</SUB>=[ME<SUP>+</SUP>A<SUP>−</SUP>]<SUB>org</SUB>×[ME<SUP>+</SUP>]<SUP>−1</SUP>[A<SUP>−</SUP>]<SUP>−1</SUP>) are NH<SUB>4</SUB><SUP>+</SUP>\simeqTl<SUP>+</SUP>\simeqRb<SUP>+</SUP>\simeqK<SUP>+</SUP>>Cs<SUP>+</SUP>\simeqAg<SUP>+</SUP>>Na<SUP>+</SUP>.
著者
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HASEGAWA Yuko
Department of Bioresources Science, Faculty of Agriculture, Kochi University
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Sekine Tatsuya
Departemnt of Chemistry, Science University of Tokyo
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Wakabayashi Hiroji
Department of Chemistry, Science University of Tokyo
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Sakuma Manabu
Department of Chemistry, Science University of Tokyo
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