Abstract
AbstractAlkyl‐substituted sym‐dibenzo‐16‐crown‐5‐oxyacetic acid and sym‐dibenzo‐16‐crown‐5‐oxydodecanic acid were synthesized and applied as ion transport carriers in liquid and film membranes. Increasing crown‐ether lipophilicity decreased acid dissociation constants and solubilities of crown‐ether carboxylic acids in water but enhanced the solubility and transport ability of the carboxylic anion‐K+ complex through a liquid organic (CH2Cl2) membrane. Transport phenomena of the cations alkali‐metal ions, alkaline‐earth metal ions and transition‐metal ions through liquid membranes based on these crown‐ether carriers were investigated, Effects of anions, crown‐ethers and pH on ion transport are discussed. A mechanism of ion transport through a crown‐ether membrane is proposed to include [OH] and [H+] in both source and target layers. Ion transport through a polymer/crown‐ether film membrane was more efficient than through a liquid membrane.
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