Relationship between transfer activity coefficients, ^S₁γ^S₂, of cryptate 2.2.2 complexes and their stability constant in various solvents

Abstract

Between dipolar aprotic solvents S₁ and S₂, the transfer activity coefficients, ^S₁γ^S₂, of complexed sodium, potassium, thallium(I), and silver ions with cryptand 2.2.2 have been found to be equal to that of the cryptand. With reference to methanol (S₁), this equality does not hold, the cryptates being more or less solvated by hydrogen bonding in this solvent. In water as a solvent, the cryptates are on a considerably higher level of free energy than in the organic solvents. This is attributed to hydrophobic hydration of the cryptates.

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