Thermodynamic study of the complexation of Cd2+ cation with 1,4,10-trioxa-7,13-diazacyclopentadecane (Kryptofix 21) in acetonitrile and its binary mixtures with methanol and ethyl aacetate

The complexation processes between Cd 2+ 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...

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Bibliographic Details
Published in:Russian journal of general chemistry 2015-05, Vol.85 (5), p.1174-1178
Main Authors: Nasiri, M., Rounaghi, Gh. H.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
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Summary:The complexation processes between Cd 2+ 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 Cd 2+ cation is 1 : 1 [M L], whereas in some solvent systems 1 : 2 [ML 2 ] and 1 : 3 [ML 3 ] complexes are formed in addition to [ML]. The thermodynamic parameters (Δ S c 0 , Δ H c 0 ) for the formation of the Kryptofix 21-Cd 2+ complex were obtained from the temperature dependence of the stability constant of the [ML] complex. The complexation reaction between Cd 2+ and Kryptofix 21 is athermic or exothermic, depending on the solvent system.
ISSN:1070-3632
1608-3350
DOI:10.1134/S1070363215050291