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The Solvent Extraction of Silver Ion by Novel Sulfur-Containing Podans
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1994, v.7 no.2, pp.225-232
Jung,
J. H., Park,
J. M., Kim,
D. Y., &
Lee,
S.
S.
(1994). The Solvent Extraction of Silver Ion by Novel Sulfur-Containing Podans. Analytical Science and Technology, 7(2), 225-232.
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Abstract
The podands I-VII, acyclic polyethers, expected high extractability for <TEX>$Ag^+$</TEX> against <TEX>$Pb^{2+}$</TEX> were designed and synthesized with high yields. Using podands I-VII as extractants, the %extraction(%Ex) of <TEX>$Ag^+$</TEX> and <TEX>$Pb^{2+}$</TEX> as picrates were determined in water/chloroform systems. The stability constants(log K) for the complexation of <TEX>$Ag^+$</TEX> with podands I-VII were also determined by potentiometry. %Ex(<TEX>$Ag^+$</TEX>) were proportional to the numbers of substituted sulfur donor atoms. Podand VI(log K : 7.65) having 3 substituted sulfur and podand VII(log K : 9.15) having 4 substituted sulfur, however, exhibited almost 100% of extractability, respectively. In %Ex(<TEX>$Ag^+/Pb^{2+}$</TEX>, oxygen-sulfur mixed donor podands(IV-VII) showed the higher values. Otherwise, the values of log K and %Ex(<TEX>$Ag^+$</TEX>) largely depended on the variation of donor-site of sulfur. From the results of NMR experiments, it seems that it is due to the <TEX>${\pi}-{\pi}$</TEX> stacking interaction between the aromatic end-groups.
- keywords
- Podand, solvent extraction, extractant, <TEX>$Ag^+$</TEX> ion, <TEX>$Pb^{2+}$</TEX> ion, %Ex, log K, NMR, donor-site effect, <TEX>${\pi}-{\pi}$</TEX> stacking
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