The association constant of macrocyclic ether-cation interactions in 1,4-dioxane/water mixtures. III - Effect of temperature on the binding
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The association constant, K-a, of Na+ with  crown-4, crown-5 and crown-6 crown ethers were determined in a binary mixture, 1,4-dioxane/water (50/50) using a Na+ ion selective electrode at different temperatures. K-a, values were determined with the relationship, 1/K-a [L-o](n+m-1) = (1-nP')(n) (1-mp')m/p', for various stoichiometries, (n:m), where P' is the mole fraction of the complexed cation. The exothermic association constants and the thermodynamic data for cation-macrocycle complexes explained in terms of Eigen-Winkler binding mechanism are given. The binding power found for Na+, however, was the highest with  crown-6.
SourceJournal Fur Praktische Chemie-Chemiker-Zeitung