Facilitated transport from ternary cation mixtures through water—chloroform—water membrane systems containing macrocyclic ligands |
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| Authors: | Reed M Izatt Robert M Haws John D Lamb David V Dearden Philip R Brown Don W McBride Jr James J Christensen |
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| Institution: | Departments of Chemistry and Chemical Engineering and Contribution Number 331 from the Thermochemical Institute, Brigham Young University, Provo, UT 84602 U.S.A. |
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| Abstract: | Cation fluxes were determined for various three-component, equimolar mixtures of alkali metal, alkaline earth, and Pb2+ cations in a H2O---CHCl3---H2O liquid membrane system incorporating macrocyclic polyethers as carriers. Carrier ligands studied were 18-crown-6, dicyclohexano-18-crown-6, 1,10-diaza-18-crown-6, 21-crown-7, dibenzo-24-crown-8, and cryptand 2.2.2]. Correlations were found between transport and relative cation:polyether cavity radii, the type of substituents present on the polyether ring, and the type and number of donor atoms present. All the ligands studied transported Pb2+ at higher rates than the other Mn+ in the mixtures. Transport behavior in these multi-cation systems can be predicted from Mn+—polyether complex stability constant data in most cases. |
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