Abstract
Abstract Enthalpy (ΔHex) and entropy changes (ΔSex) for overall extractions of alkali metal (Na, K, Rb, and Cs) picrates with 18-crown-6 (18C6), and those (ΔHD,L and ΔSD,L) for distribution of 18C6 itself were determined between CHCl3 and water, all the extracted complexes being 1:1:1 complexes. The ΔHex and ΔSex values of 18C6 for all the alkali metals are negative. The ΔHD,L and ΔSD,L values of 18C6 are both positive. Enthalpy (ΔHex′) and entropy changes (ΔSex′) for ion-pair extractions of 18C6-alkali metal ion complexes with picrate anions were calculated. All the ΔHex′ and ΔSex′ values are negative except for ΔSex′ value of Na (positive). The ion-pair extractions were discussed from the thermodynamic point of view.
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