The solvent extraction of several univalent metal picrates by 15-crown-5 and 18-crown-6.
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概要
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The overall extraction equilibrium constants (<I>K</I><SUB>ex</SUB>) for 1:1:1 complexes of 15-crown-5 (15C5) and 18-crown-6 (18C6) with several univalent metal picrates between benzene and water have been determined at 25 °C. The <I>K</I><SUB>ex</SUB> sequences of the univalent metal ion with 15C5 and 18C6 are Ag<SUP>+</SUP>>Na<SUP>+</SUP>>Tl<SUP>+</SUP>>>K<SUP>+</SUP>>Rb<SUP>+</SUP>>Cs<SUP>+</SUP>>Li<SUP>+</SUP> and Tl<SUP>+</SUP>>K<SUP>+</SUP>>Rb<SUP>+</SUP>>Ag<SUP>+</SUP>>Cs<SUP>+</SUP>>Na<SUP>+</SUP>>>Li<SUP>+</SUP> respectively. The <I>K</I><SUB>ex</SUB> series for each same crown ether reflects the stability and the extractability of the univalent metal ion-crown ether complex in the aqueous phase. The <I>K</I><SUB>ex</SUB> sequences for the 15C5 system depends entirely on the extractability of the univalent metal ion-crown ether complex. In the case of the 18C6 system this largely depends on the stability of the univalent metal ion-crown ether complex.
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