Design, synthesis and evaluation of diazadibenzocrown ethers as Pb²⁺ extractants and carriers in plasticized cellulose triacetate membranes

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• 作者：Aguilar ; Julio C. ; Miguel ; Eduardo Rodrí ; guez de San ; Gyves ; Josefina de ; Bartsch ; Richard A. ; et. al.
• 刊名：Talanta
• 出版年：2001
• 出版时间：July 6, 2001
• 年：2001
• 卷：54
• 期：6
• 页码：1195-1204
• 全文大小：177 K

文摘

The ligands 4,7-diaza-2,3,8,9-dibenzo-15-crown-5 (L1), 4,10-diaza-2,3,11,12-dibenzo-18-crown-6 (L2), 4,10-diaza-2,3,11,12-di(4′-tert-butylbenzo)-18-crown-6 (L3) and N,N-di(methylenecarboxyethoxy) 4,10-diaza-2,3,11,12-dibenzo-18-crown-6 (L4) have been prepared. Partition coefficients and acid dissociation constants for these four diazadibenzocrown ether compounds were determined in water-chloroform. Their effectiveness was assessed in solvent extraction of Pb²⁺ from aqueous solutions into toluene. Ligands L3 and L4 provide high selectivity for Pb²⁺ over Cd²⁺ and Zn²⁺ in transport across plasticized cellulose triacetate membranes.