Metal Ion Complexation by Ionic Crown Ethers. Progress Report, April 1, 1983-December 31, 1984

摘要

During the fourth year of this project, 11 new crown ethers with pendant carboxylic acid groups and 14 novel acyclic polyether dicarboxylic acids were prepared. Viable synthetic routes to 9 unique hydroxymethyl-substituted, small-ring and large-ring crown ethers were also developed. Complexation of alkali metal and alkaline earth cations by ionizable crown ethers and of alkaline earth cations by acyclic polyether dicarboxylic acids has been assessed by the techniques of competitve solvent extraction and competitive, coupled transport across liquid surfactant membranes. In addition, the selectivity and efficiency of alkali metal complexation by a series of non-ionizable benzyloxymethyl-substituted crown ethers was determined with a picrate extraction technique. Synthesis of a novel cyclic tetraphosphate ligand for uranium is also in progress. (ERA citation 09:035870)