CATION BINDING PROPERTIES OF CROWN ETHER-MODIFIED POLYETHYLENIMINES.

Jun Ichi Anzai, Yoko Sakata, Yasuhiro Suzuki, Akihiko Ueno, Tetsuo Osa

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

In the reported experiments, crown ether-modified polyethylenimines (PEI-CR) were prepared to elucidate their cation binding efficiency and selectivity by liquid-liquid and solid-liquid extraction methods. With alkali metal cations it was found that polyethylenimines containing benzo-15-crown-5 moieties (Ia and Ib) extracted all cations examined more efficiently than their monomeric analogs, especially in the cases of K** plus and Rb** plus cations. The solid-liquid extraction revealed clearly that the polymers complexed with K** plus and Rb** plus cations according to a 1:2 cation-to-crown stoichiometry. The high selectivities of the polymers for K** plus and Rb** plus were interpreted in terms of the favorable conformation of the polymer chain for the formation of intramolecular 1:2 complexes. On the contrary, these polymers bound alkali earth cations less effectively with low selectivities.

Original languageEnglish
Pages (from-to)855-864
Number of pages10
JournalJournal of polymer science. Part A-1, Polymer chemistry
Volume21
Issue number3
Publication statusPublished - 1983 Jan 1

ASJC Scopus subject areas

  • Engineering(all)

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