Abstract
The complexation processes between Cd2+ cation and a macrocyclic ligand, 1,4,10-trioxa-7,13-diazacyclopentadecane (Kryptofix 21) were studied by the conductometric method in pure acetonitrile and acetonitrile-methanol and acetonitrile-ethyl acetate binary mixtures at different temperatures. In some cases, the stoichiometry of the complex formed between Kryptofix 21 with Cd2+ cation is 1 : 1 [M L], whereas in some solvent systems 1 : 2 [ML2] and 1 : 3 [ML3] complexes are formed in addition to [ML]. The thermodynamic parameters (ΔSc0, ΔHc0) for the formation of the Kryptofix 21-Cd2+ complex were obtained from the temperature dependence of the stability constant of the [ML] complex. The complexation reaction between Cd2+ and Kryptofix 21 is athermic or exothermic, depending on the solvent system.
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