Calix[4]arene dibenzocrown ethers as caesium selective extractants
作者： Jong Seung Kim , Jin Hyun Pang , Ill Yong Yu , Won Ku Lee , Il Hwan Suh
DOI: 10.1039/A808499H
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摘要: A series of 1,3-dialkyloxycalix[4]arene dibenzocrown ethers were synthesized in the fixed 1,3-alternate conformation with good yields by reaction 1,3-dialkyloxycalix[4]arenes dibenzodimesylate presence caesium carbonate. The three dimensional was confirmed X-ray crystal structure. Upon two phase extraction, NMR studies on ligand–metal complex, single ion and competitive transport experiments through a bulk liquid membrane, 1,3-dipropyloxycalix[4]arene dibenzocrown-6, which benzo groups are symmetrically attached to crown-6 linkage, gave one most efficient selective extractabilities for over other alkali metal ions. From supported membrane using 1 3 as organic carriers, permeation coefficients estimated be 0.42 0.27 cm h–1, respectively. selectivity sodium observed increase time.
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