Abstract
Functions of noncyclic polythers have been paid attention in recent years. Their molecular structures were designed with the change of chain structures, terminal groups, kinds and numbers of hetero atoms, etc. They were demonstrated to be available as carriers for ion-transport through liquid membranes, solvent extraction, ion-selective electrodes, and so on. It is in detail described that noncyclic polyethers exhibiting Li+ -selectivity which have been newly prepared can be useful not only for ion-separation but also for ion-analysis. In addition, the relationship between their structures and functions has been discussed based on spectroscopic behaviors, X-ray analysis, and also the inspection of CPK molecular model.
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