Calix[4]arene dibenzocrown ethers as caesium selective extractants

Jong Seung Kim, Jin Hyun Pang, Ill Yong Yu, Won Ku Lee, Il Hwan Suh, Jong Kuk Kim, Moon Hwan Cho, Eun Tae Kim, Do Young Ra

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20 Citations (Scopus)


A series of 1,3-dialkyloxycalix[4]arene dibenzocrown ethers were synthesized in the fixed 1,3-alternate conformation with good yields by the reaction of 1,3-dialkyloxycalix[4]arenes with dibenzodimesylate in the presence of caesium carbonate. The three dimensional 1,3-alternate conformation was confirmed by X-ray crystal structure. Upon two phase extraction, NMR studies on the ligand-metal complex, single ion and competitive ion transport experiments through a bulk liquid membrane, 1,3-dipropyloxycalix[4]arene dibenzocrown-6, in which two benzo groups are symmetrically attached to the crown-6 linkage, gave one of the most efficient and selective extractabilities for caesium ion over other alkali metal ions. From supported liquid membrane experiments using 1 and 3 as organic carriers, permeation coefficients of the caesium ion were estimated to be 0.42 and 0.27 cm h-1, respectively. The selectivity of caesium over sodium ion was observed to increase with permeation time.

Original languageEnglish
Pages (from-to)837-846
Number of pages10
JournalJournal of the Chemical Society. Perkin Transactions 2
Issue number4
Publication statusPublished - 1999 Apr
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)


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