caa a22 4500 469059974 CHVBK 20180323132854.0 cr unu---uuuuu 170328e19920901xx s 000 0 eng 10.1007/BF01045988 doi (NATIONALLICENCE)springer-10.1007/BF01045988 Thermodynamic study of solvent extraction of monovalent metal picrates with benzo-18-crown-6 into chloroform [Elektronische Daten] [Yasuyuki Takeda, Takehiro Iwasaki, Yoshihiro Kudo, Hiroaki Matsuda] Thermodynamic parameters (ΔH ex 0 and ΔS ex 0 ) for the overall extractions of monovalent metal (Na, K, Rb, and Tl) picrates with benzo-18-crown-6 (B18C6), and those (ΔH D,L 0 and ΔS D,L 0 ) for the distribution of B18C6 were determined between chloroform and water. All the extracted B18C6 complexes were l:1:1 complexes (B18C6:metal ion: picrate anion). The ΔH ex 0 and ΔS ex 0 values for all the metals are negative. Every extraction of the metal picrate with B18C6 is completely enthalpy driven. The ΔH D,L 0 and ΔS D,L 0 values of B18C6 are both positive, and the partition of B18C6 is entirely entropy driven. Enthalpy (ΔH ex,ip 0 ) and entropy changes (ΔS ex,ip 0 ) for ion-pair extractions of B18C6-metal ion complexes with picrate anions were calculated. All the ΔH ex,ip 0 and ΔS ex,ip 0 values are negative, and the ion-pair extractions are completely enthalpy driven. Kluwer Academic Publishers, 1992 Solvent extraction nationallicence thermodynamics nationallicence benzo-18-crown-6 nationallicence monovalent metal picrates nationallicence chloroform nationallicence Takeda Yasuyuki Department of Chemistry, Faculty of Science, Chiba University, Yayoi-cho, 263, Inage-ku, Chiba, Japan aut Iwasaki Takehiro Department of Chemistry, Faculty of Science, Chiba University, Yayoi-cho, 263, Inage-ku, Chiba, Japan aut Kudo Yoshihiro Department of Chemistry, Faculty of Science, Chiba University, Yayoi-cho, 263, Inage-ku, Chiba, Japan aut Matsuda Hiroaki Department of Chemistry, Faculty of Science, Chiba University, Yayoi-cho, 263, Inage-ku, Chiba, Japan aut Journal of inclusion phenomena and molecular recognition in chemistry Kluwer Academic Publishers 14/3-4(1992-09-01), 303-309 0923-0750 14:3-4<303 1992 14 10847 https://doi.org/10.1007/BF01045988 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01045988 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Takeda Yasuyuki Department of Chemistry, Faculty of Science, Chiba University, Yayoi-cho, 263, Inage-ku, Chiba, Japan aut NATIONALLICENCE 700 1- Iwasaki Takehiro Department of Chemistry, Faculty of Science, Chiba University, Yayoi-cho, 263, Inage-ku, Chiba, Japan aut NATIONALLICENCE 700 1- Kudo Yoshihiro Department of Chemistry, Faculty of Science, Chiba University, Yayoi-cho, 263, Inage-ku, Chiba, Japan aut NATIONALLICENCE 700 1- Matsuda Hiroaki Department of Chemistry, Faculty of Science, Chiba University, Yayoi-cho, 263, Inage-ku, Chiba, Japan aut NATIONALLICENCE 773 0- Journal of inclusion phenomena and molecular recognition in chemistry Kluwer Academic Publishers 14/3-4(1992-09-01), 303-309 0923-0750 14:3-4<303 1992 14 10847 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer