Interphase transfer of potassium and silver picrates with the participation of macrocyclic polyethers

Phosphorus-Containing Macrocyclic Ionophores in Metal Ion Separations

“…In contrast, efficient macrocycle-mediated transport of metal ions through a liquid membrane, which involves both the complexation process at the source aqueous solution-organic phase interface and decomplexation at the organic phase-receiving aqueous solution interface, requires an average stability of the metal ion-ionophore complex. In the earlier works, the greatest rates of CE-mediated membrane transport of alkali metal 6 and silver 7 ions were observed with the macrocyclic complex stability constants in solution 6 and in the extraction system 7 of 5-6 log units.…”

“…For ligands 3c and 3e , a moderate-to-weak extracting ability toward Hg II and Pd II was observed . Additionally, CEs 3c − f showed high rates of Ag + transport through BLM 6 (see Table ) and only slight ionophoric activity for K + . , On the other hand, 3c was found to induce permeability of BiLLM for K + , Na + , and Ca 2+ . , …”

“…11 Additionally, CEs 3c-f showed high rates of Ag + transport through BLM 6 (see Table 3) and only slight ionophoric activity for K + . 7,13 On the other hand, 3c was found to induce permeability of BiLLM for K + , Na + , and Ca 2+ . 12, 14 The percentage of extraction of Ag + , Hg II , and Pd II into CHCl 3 by CE 4 containing two endocyclic thiophosphonyl groups was reported 11 to be essentially the same as those for ligands 3c and 3e.…”

“…ity for soft electron acceptors. 3c-f exhibited efficient extraction of AgPic into 1,2-dichloroethane (DCE) with extraction constants of 5-6 log units 7 and average levels of extraction into CHCl 3 . 11 For ligands 3c and 3e, a moderate-to-weak extracting ability toward Hg II and Pd II was observed.…”

“…0.8 a 48.5 3d [7] 0.6 a 44.0 3e [7] 0.6 a 40.0 3f [7] 0. with that of 12a and revealed the selectivity for Na + and Rb + , respectively. (It is interesting that LE 12b not only overcame significantly the AMC extraction efficiency of its analogue containing no pendant phosphonate groups but also showed a contrasting selectivity order.)…”