Enthalpic characteristics of solvation of 1-AZA-18-Crown-6 in aqueous-ethanol and aqueous dimethylsulfoxide solvents

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Abstract

The heat effects of dissolution of 1-aza-18-crown-6 in mixed water-ethanol and water-dimethylsulfoxide solvents at 298.15 K are determined by the calorimetric method. Dissolution of 1-aza-18-crown-6 is found to be exothermic in water and in water-organic solvents with initial co-solvent additions. For co-solvent contents greater than 0.2 mole fraction, dissolution of 1-aza-18-crown-6 is accompanied by an endo effect, which increases with the increasing content of both ethanol and dimethyl sulfoxide. The enthalpies of transfer of 1-aza-18-crown-6 from water to aqueous solutions of ethanol and dimethyl sulfoxide are calculated. The enthalpic characteristics of solvation of crown ethers in aqueous-organic solvents are compared.

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T. R. Usacheva

Ivanovo State University of Chemistry and Technology

Author for correspondence.
Email: oxt@isuct.ru
Russian Federation, Ivanovo

O. N. Krutova

Ivanovo State University of Chemistry and Technology

Email: oxt@isuct.ru
Russian Federation, Ivanovo

N. N. Kuranova

Ivanovo State University of Chemistry and Technology

Email: oxt@isuct.ru
Russian Federation, Ivanovo

R. A. Kushnir

Ivanovo State University of Chemistry and Technology

Email: oxt@isuct.ru
Russian Federation, Ivanovo

O. V. Kashina

Ivanovo State University of Chemistry and Technology

Email: oxt@isuct.ru
Russian Federation, Ivanovo

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Supplementary files

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2. Fig. 1. Structural formula of 1-aza-18-crown-6.

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3. Fig. 2. Change in the enthalpies of transfer of crown ethers benzo-15K5 (1) [17], 15K5 (2) [17] in mixtures of water with 2-PrOH; 18K6 (3) [13], 1-aza-18K6 (4) in mixtures of water with EtOH.

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4. Fig. 3. Change in the enthalpies of transfer of crown ethers 12C4 (1) [18], benzo-15C5 [20] (2), 15C5 [19] (3), 18C6 (4) [13], 1-aza-18C6 (6) in aqueous DMSO.

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