caa a22 4500 467919321 CHVBK 20180406152912.0 cr unu---uuuuu 170328e20060901xx s 000 0 eng 10.1007/s00706-006-0523-z doi (NATIONALLICENCE)springer-10.1007/s00706-006-0523-z Experimental Evidence for a Calix[4]arene-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) + 1 ·Na+(nb) ⇆ 1 ·H+(nb) + Na+(aq) taking place in the two-phase water-nitrobenzene system (1 = p-tert-butylcalix[4]arene-tetrakis(N, N-diethylacetamide); aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log K ex(H+, 1 ·Na+) = −1.4 ± 0.1. Further, the stability constant of the p-tert-butylcalix[4]arene-tetrakis(N,N-diethylacetamide)-H+ complex in water saturated nitrobenzene was calculated for a temperature of 25°C as log βnb(1 · H+) = 8.1 ± 0.1. Springer-Verlag, 2006 Keywords. Calixarenes nationallicence Macrocycles nationallicence Protonation nationallicence Stability constant nationallicence p-tert -Butylcalix[4]arene-tetrakis( N , N -diethylacetamide) nationallicence Makrlík Emanuel Faculty of Applied Sciences, University of West Bohemia, Pilsen, Czech Republic aut Vaňura Petr Prague Institute of Chemical Technology, Prague, Czech Republic aut Monatshefte für Chemie / Chemical Monthly Springer-Verlag 137/9(2006-09-01), 1185-1188 0026-9247 137:9<1185 2006 137 706 https://doi.org/10.1007/s00706-006-0523-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00706-006-0523-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Makrlík Emanuel Faculty of Applied Sciences, University of West Bohemia, Pilsen, Czech Republic aut NATIONALLICENCE 700 1- Vaňura Petr Prague Institute of Chemical Technology, Prague, Czech Republic aut NATIONALLICENCE 773 0- Monatshefte für Chemie / Chemical Monthly Springer-Verlag 137/9(2006-09-01), 1185-1188 0026-9247 137:9<1185 2006 137 706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer