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Effect of Water–Ethanol Solvents on the Protonation Constants of Cryptand[2.2.2]

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Abstract

The protonation constants of cryptand[2.2.2] are determined potentiometrically at 298 K in water–ethanol solvents of variable composition. An increase in the concentration of a solution’s nonaqueous component reduces the equilibrium constants of the reactions of mono- and biprotonated cryptand[2.2.2] formation. The contribution from the resolvation of reagents to the change in the Gibbs energy of the studied reactions is estimated. The reduction in the protonation constants of cryptand[2.2.2] in water–ethanol solvents is mainly due to enhancement of the solvation of protons in water–ethanol mixtures.

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Authors and Affiliations

  1. Ivanovo State University of Chemistry and Technology, Ivanovo, 153000, Russia

    V. A. Isaeva & V. A. Sharnin

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  1. V. A. Isaeva
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  2. V. A. Sharnin
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Correspondence to V. A. Isaeva.

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Original Russian Text © V.A. Isaeva, V.A. Sharnin, 2018, published in Zhurnal Fizicheskoi Khimii, 2018, Vol. 92, No. 4, pp. 600–603.

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Isaeva, V.A., Sharnin, V.A. Effect of Water–Ethanol Solvents on the Protonation Constants of Cryptand[2.2.2]. Russ. J. Phys. Chem. 92, 710–713 (2018). https://doi.org/10.1134/S0036024418040088

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  • DOI: https://doi.org/10.1134/S0036024418040088

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