Abstract
The complex formation between lanthanide cations and the macrocyclic ligand cucurbit[6]uril has been studied in aqueous solution and in aqueous formic acid using different experimental techniques. With the exception of Nd 3+ the stability constants of all complexes formed in aqueous formic acid are nearly identical. The values of the reaction enthalpies abruptly increase from a mean value of 1–3.4 kJ mol −1 going from Eu 3+ to Gd 3+. The values of the reaction entropies are nearly identical for all lanthanide cations. In pure aqueous solution a slight increase of the stability constants from La 3+ to Lu 3+ is observed.
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