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Enthalpy Characteristics of N-Methylglycine Dissolution in Some Aqueous–Organic Mixtures at 298.15 K

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Abstract

The enthalpies of N-methylglycine dissolution in aqueous solutions of acetonitrile (AN), 1,4-dioxane (DO), acetone (AC), and dimethylsulfoxide (DMSO) at a mole fraction of an organic solvent x2 of 0‒0.25 and T = 298.15 K. The results of the experiment were used to calculate the standard values of the enthalpies of dissolution (\({{\Delta }_{{{\text{sol}}}}}H^\circ \)) and transfer (\({{\Delta }_{{{\text{tr}}}}}H^\circ \)) of N-methylglycine from water to the mixed solvent, as well as the enthalpy coefficients of pairwise interactions (hxy) of N-methylglycine with organic solvent molecules. The influence of the composition of an aqueous–organic mixture and the structure of organic solvents on the enthalpy characteristics of dissolution and transfer of N-methylglycine is considered. The effect of energetics of intermolecular interactions between the components of a mixed solvent on intermolecular interactions of N-methylglycine with co-solvent molecules is estimated. The main properties of the cosolvent that significantly affect the energetics of interaction with N-methylglycine molecules in an aqueous solution are determined—polarity/polarizability and the electron-donating ability of the cosolvent.

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Correspondence to V. I. Smirnov.

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Translated by A. Zeigarnik

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Smirnov, V.I., Badelin, V.G. Enthalpy Characteristics of N-Methylglycine Dissolution in Some Aqueous–Organic Mixtures at 298.15 K. Russ. J. Phys. Chem. 93, 1465–1470 (2019). https://doi.org/10.1134/S0036024419080296

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  • DOI: https://doi.org/10.1134/S0036024419080296

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