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Ionic association and solvation in solutions of magnesium and nickel perchlorates in acetonitrile

  • Physical Chemistry of Solutions
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Abstract

The paper presents the conductometric data on solutions of Mg(ClO4)2 and Ni(ClO4)2 in acetonitrile over the temperature ranges 5–55°C for Mg(ClO4)2 and 25–75°C for Ni(ClO4)2. The extended Lee-Wheaton equation for unsymmetrical electrolytes was used to determine the limiting equivalent conductivities of the Mg2+, Ni2+, and ClO −4 ions and first-step ionic association constants with the formation of [KtClO4]+ ion pairs. Lower ionic association constants for Ni(ClO4)2 compared with Mg(ClO4)2 were a consequence of stronger non-Coulomb repulsion in the formation of [KtClO4]+ ion pairs because of the formation of a firmer solvation shell by the nickel compared with magnesium cation. The structure-dynamic parameter of ionic solvation was estimated. It was found that spatial-time correlations in the nearest environment of ions increased in the series ClO −4 > Mg2+ > Ni2+.

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Authors and Affiliations

  1. Karazin Kharkiv National University, Kharkiv, Ukraine

    O. N. Kalugin, V. N. Agieienko, N. A. Otroshko & V. V. Moroz

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  1. O. N. Kalugin
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  2. V. N. Agieienko
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  3. N. A. Otroshko
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  4. V. V. Moroz
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Correspondence to O. N. Kalugin.

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Original Russian Text © O.N. Kalugin, V.N. Agieienko, N.A. Otroshko, V.V. Moroz, 2009, published in Zhurnal Fizicheskoi Khimii, 2009, Vol. 83, No. 2, pp. 299–305.

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Kalugin, O.N., Agieienko, V.N., Otroshko, N.A. et al. Ionic association and solvation in solutions of magnesium and nickel perchlorates in acetonitrile. Russ. J. Phys. Chem. 83, 231–237 (2009). https://doi.org/10.1134/S0036024409020150

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  • DOI: https://doi.org/10.1134/S0036024409020150

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