which contain 3-carboxy-2-hydroxyphenyl group as one terminal group were prepared. These polyethers exhibit the ability to transport alkalineearthmetal ions through chloroform liquid membrane, but not to transport alkali metal ions. Highly Ba++ -selective ionophores were synthesized in this series.
Noncyclic polyethers exhibiting lithium ion selectivity have been synthesized. Their competitive alkalimetal-ion transport through liquid membranes has been investigated, and the influence of their structures on the rates and selectivities of cationtransport has been demonstrated. It has been found that the introduction of the oxytrimethylene chain on the polyethers is significant for the appearance
PVCmembraneelectrodes based on noncyclicpolyetherscontaining sulphinyl groups exhibit appreciable selectivity for Ca2+ relative to Mg2+, alkali metal ions, and H+.