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Conductometric and 1H NMR studies of thermodynamics of complexation of Zn2+, Cd2+ and Pb2+ ions with tetrathia-12-crown-4 in dimethylsulfoxide-nitrobenzene mixtures

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Abstract

The complex formation between Zn2+, Cd2+ and Pb2+ ions with macrocyclic ligand, tetrathia12-crown-4 (12S4) was studied in dimethylsulfoxide (DMSO)–nitrobenzene binary mixtures at different temperatures using conductometric and 1H NMR methods. In all cases, 12S4 found to form 1:1 complexes with these cations. The formation constants of the resulting 1:1 complexes in different solvent mixtures were determined by computer fitting of the resulting molar conductance- and chemical shift-mole ratio data. There is an inverse relationship between the complex stability and the amount of DMSO in the solvent mixtures. The stability of the resulting M2+-12S4 complexes found to decrease in the order Pb2+ > Cd2+ > Zn2+. The values of ∆H°, ∆S° and ∆G° for complexation reactions were evaluated from the temperature dependence of formation constants via van’t Hoff method. The obtained results revealed that, in all cases, the complexes are enthalpy stabilized, but entropy destabilized and the values of ∆H° and ∆S° are strongly depend on the nature of medium. There is also a linear relationship between all ΔH° and TΔS° values indicating the existence of entropy–enthalpy compensation in complexation of the three cations and ligand in the solvent systems studied.

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Acknowledgments

The financial support of this work by Razi University Research Council and Iran National Elites Foundation is gratefully acknowledged.

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  1. Department of Chemistry, Razi University, Kermanshah, Iran

    M. Shamsipur, F. Nasri & A. Taherpour

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  1. M. Shamsipur
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  2. F. Nasri
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Shamsipur, M., Nasri, F. & Taherpour, A. Conductometric and 1H NMR studies of thermodynamics of complexation of Zn2+, Cd2+ and Pb2+ ions with tetrathia-12-crown-4 in dimethylsulfoxide-nitrobenzene mixtures. J Incl Phenom Macrocycl Chem 78, 429–436 (2014). https://doi.org/10.1007/s10847-013-0314-1

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