204652-01-7Relevant academic research and scientific papers
Novel calix[4]arene dibenzocrown ethers bearing lipophilic alkyl groups symmetrically branched
Kim, Jong Seung,Pang, Jin Hyun,Suh, Il Hwan,Kim, Dae Whang,Kim, Dong Won
, p. 677 - 685 (1998)
1,3-dialkyloxycalix[4]arene dibenzocrown ether in which two lipophilic butyl groups are symmetrically attached were successfully synthesized in the fixed 1,3-alternate conformation (12 and 13) of which structure was characterized by X-ray crystal structure.
Calix[4]arene dibenzocrown ethers as caesium selective extractants
Kim, Jong Seung,Pang, Jin Hyun,Yu, Ill Yong,Lee, Won Ku,Suh, Il Hwan,Kim, Jong Kuk,Cho, Moon Hwan,Kim, Eun Tae,Ra, Do Young
, p. 837 - 846 (2007/10/03)
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.
