The complexation of Pb2+ by noncyclic, macrocyclic and macrobicyclic ligands in aqueous solution was studied by calorimetric titration. In the case of noncyclic polyethers the contribution of reaction enthalpy to complex stability is much smaller when compared with macrocyclic polyethers. Complex stabilities increase if oxygen donor atoms are substituted by nitrogen. A further increase in complex stability is observed for the macrobicyclic ligands (cryptands), mainly caused by a further increase in reaction enthalpies.
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