Synergistic extraction of some divalent metal cations into nitrobenzene by using strontium dicarbollylcobaltate and electroneutral macrocyclic lactam receptor |
| |
Authors: | Emanuel Makrlík Zdeňka Sedláková Petr Vaňura Pavel Selucký |
| |
Institution: | 1. Faculty of Environmental Sciences, Czech University of Life Sciences, Kamycká 129, 165 21, Prague 6, Czech Republic 2. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovského Sq. 2, 162 06, Prague 6, Czech Republic 3. Department of Analytical Chemistry, Institute of Chemical Technology, Technická 5, 166 28, Prague 6, Czech Republic 4. Nuclear Research Institute, 250 68, ?e?, Czech Republic
|
| |
Abstract: | From extraction experiments and $ \gamma $ -activity measurements, the exchange extraction constants corresponding to the general equilibrium M2+(aq) + 1·Sr2+(nb) $ \Leftrightarrow $ 1·M2+(nb) + Sr2+(aq) taking place in the two-phase water–nitrobenzene system (M2+ = Mg2+, Ca2+, Ba2+, Pb2+, Cu2+, Zn2+, Cd2+, $ {\hbox{UO}}_{2}^{2 + } $ , Mn2+, Co2+, Ni2+; 1 = macrocyclic lactam receptor–see Scheme 1; aq = aqueous phase, nb = nitrobenzene phase) were evaluated. Moreover, the stability constants of the 1·M2+ complexes in nitrobenzene saturated with water were calculated; they were found to increase in the following cation order: Mg2+ < Co2+ < Cu2+, Mn2+, Ni2+ < Cd2+ < Ca2+ < Ba2+, Zn2+ < Pb2+ < $ {\hbox{UO}}_{2}^{2 + } $ . Scheme 1 Structural formula of 2,18-dichloro-9,10,11,12-tetrahydro-6H, 20H-dibenzol,o]1,11,4,8]dioxadiazacyclohexadecine-7,13(8H, 14H)-dione (abbrev. 1) |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|