Solvent extraction of alkali metal picrates with poly- and bis(benzo-12-crown-4)s.
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概要
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Solvent extractions of alkali metal picrates were carried out using newly synthesized poly- and bis(crown ether)s containing benzo-12-crown-4 moieties in a water-chloroform system. The extraction equilibrium constants(<I>K</I><SUB>e</SUB>) and the complexation constants (<I>K</I><SUB>c</SUB>) in the chloroform phase were determined at 25 °C. The <I>K</I><SUB>e</SUB> values for the alkali metal cations decreases as follows: Na<SUP>+</SUP>>K<SUP>+</SUP>>Rb<SUP>+</SUP>≥Cs<SUP>+</SUP> with the poly(benzo-12-crown-4) and K<SUP>+</SUP>, Rb<SUP>+</SUP>, Cs<SUP>+</SUP>>Na<SUP>+</SUP> with the bis(benzo-12-crown-4). The poly(benzo-12-crown-4) improved the sodium-ion selectivity of the corresponding monocyclic analog because of the easy formation of 2:1 crown ether unit-cation complexes assisted by the cooperative action of two adjacent crown ether units, while the bis(benzo-12-crown-4) did not. A separate extraction experiment was also undertaken in a water-dichloromethane system in order to compare the extractability of these benzo-12-crown-4 derivatives with that of 12-crown-4.
- 公益社団法人 日本化学会の論文
著者
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Shono Toshiyuki
Department Of Applied Chemistry Faculty Of Engineering Osaka Institute Of Technology
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Kimura Keiichi
Department Of Applied Chemistry Faculty Of Systems Engineering Wakayama University
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Maeda Takumi
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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