Abstract
Three series of lipophilic acyclic di-ionizable polyethers are synthesized to probe the effect of structural variation within the acidic end groups on the solvent extraction selectivity and efficiency for divalent metal cations. Common polyether spacers of –O(CH2CH2O)3– connect the two aromatic carboxylic acid or N-(X)sulfonyl carboxamide end groups. For the latter, variation of the X group from methyl to phenyl to 4-nitrophenyl to trifluoromethyl serves to ‘tune’ the acidity of the ionizable group. Results for competitive solvent extractions of alkaline earth metal cations and single species extractions of Hg2+ and of Pb2+ from aqueous solutions into chloroform are reported.
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