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Design, synthesis and evaluation of diazadibenzocrown ethers as Pb(2+) extractants and carriers in plasticized cellulose triacetate membranes |
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| Authors: | Aguilar J C Miguel E R Gyves J Bartsch R A Kim M |
| Institution: | a Departamento de Quimica Analitica, Facultad de Quimica, UNAM, Ciudad Universitaria, Mexico, D.F. 04510, Mexico b Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA |
| Abstract: | 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. |
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