caa a22 4500 467920494 CHVBK 20180406152915.0 cr unu---uuuuu 170328e20060201xx s 000 0 eng 10.1007/s00706-005-0422-8 doi (NATIONALLICENCE)springer-10.1007/s00706-005-0422-8 Experimental Evidence for a Valinomycin - Proton Complex [Elektronische Daten] [Emanuel Makrlík, Petr Vaňura] Summary.: From extraction experiments and γ-activity measurements, the extraction constant corresponding to the equilibrium H+ (aq) + NaL+ (nb) = HL+ (nb) + Na+ (aq) taking place in the two-phase water-nitrobenzene system (L = valinomycin, aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log Kex (H+, NaL+) = −1.1 ± 0.1. Further, the stability constant of the valinomycin-proton complex in nitrobenzene saturated with water was calculated as log βnb(HL+) = 5.3 ± 0.1. Finally, the stability constants of complexes of some univalent cations with valinomycin were summarized and discussed. Springer-Verlag/Wien, 2006 Keywords. Antibiotics nationallicence Macrocycles nationallicence Protonation nationallicence Stability constant nationallicence Valinomycin nationallicence Makrlík Emanuel Faculty of Applied Sciences, University of West Bohemia, 306 14, Pilsen, Czech Republic aut Vaňura Petr Prague Institute of Chemical Technology, Prague 6, 166 28, Czech Republic aut Monatshefte für Chemie / Chemical Monthly Springer-Verlag 137/2(2006-02-01), 157-161 0026-9247 137:2<157 2006 137 706 https://doi.org/10.1007/s00706-005-0422-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00706-005-0422-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Makrlík Emanuel Faculty of Applied Sciences, University of West Bohemia, 306 14, Pilsen, Czech Republic aut NATIONALLICENCE 700 1- Vaňura Petr Prague Institute of Chemical Technology, Prague 6, 166 28, Czech Republic aut NATIONALLICENCE 773 0- Monatshefte für Chemie / Chemical Monthly Springer-Verlag 137/2(2006-02-01), 157-161 0026-9247 137:2<157 2006 137 706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer