Abstract
Stability constants K s and rate constants of formation and dissociation of alkaline earth metal complexes with the diaza-crown ethers (2,2) and (2,2-Me 2) in methanol are reported, together with corresponding thermodynamic parameters. It od shown that it is possible to determine the dissociation rate constants k d of these crown ether complexes from stopped-flow experiments. The values of K s and k d for (2,2,) complexes are displaced parallel with respect to the corresponding values for (2,2-Me 2) complexes, and variations of K s with metal ion radius are reflected in similar (inverse) variations of k d. However, enthalpies and entropies of reaction and activation point to differences in the behaviour of the two ligands.
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