D2O−H2O solvent isotope effects on the enthalpies of bicaret hydration and dilution of its aqueous solutions at different temperatures

D2O−H2O solvent isotope effects on the enthalpies of bicaret hydration and dilution of its aqueous solutions at different temperatures Full article

Journal

Thermochimica Acta
ISSN: 1872-762X , E-ISSN: 0040-6031

Output data

Year: 2014, Volume: 590, Pages: 145-150 Pages count : 6 DOI: 10.1016/j.tca.2014.05.011

Authors

Ivanov Evgeniy V. ¹ , Batov Dmitriy V. ^2,3 , Gazieva Galina A. ⁴ , Kravchenko Angelina N. ⁴ , Abrosimov Vladimir K. ¹

Affiliations

1	Laboratory of Thermodynamics of Solutions of Non-Electrolytes and Biologically Active Substances, G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, 1 Akademicheskaya Str., 153045 Ivanovo, Russian Federation
2	Incorporated Physicochemical Center of Solution Researches, G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, 1 Akademicheskaya Str., 153045, Ivanovo, Russian Federation
3	Ivanovo's State University of Chemistry and Technology, 7 Sheremetevsky Ave, 153000 Ivanovo, Russian Federation
4	Laboratory of Nitrogen-containing Compounds, N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Ave., 199119 Moscow, Russian Federation

The molar enthalpies of solution of bicaret or 2,4,6,8-tetraethyl-2,4,6,8-tatraazabicyclo[3.3.0]octane-3,7-dione in ordinary (H2O) and heavy (D2O) water at (278.15, 288.15, 298.15, 308.15, and 318.15) K as well as the enthalpies for dilution of its H/D isotopically distinguishable aqueous solutions at 298.15 K were measured calorimetrically. The standard (at infinite dilution) molar enthalpies and heat capacities of solution, and the enthalpic coefficients for pair (h22) and triplet (h222) interactions between hydrated solute molecules, along with D2O–H2O solvent isotope effects (IEs) on the studied quantities were computed. The enthalpic effects of bicaret dissolution and corresponding IEs were found to be negative and decreasing in magnitude with increasing temperature. On the contrary, the h22 and h222 values as well as IEs on them were found to be positive. These facts indicate that the bicaret hydration being predominantly hydrophobic is enhanced in the D2O medium. The hydration behavior of the solute considered was discussed in comparison with that for mebicar or 2,4,6,8-tetramethyl-2,4,6,8-tatraazabicyclo[3.3.0]octane-3,7-dione using the previously obtained data.

Ivanov E.V. , Batov D.V. , Gazieva G.A. , Kravchenko A.N. , Abrosimov V.K.
D2O−H2O solvent isotope effects on the enthalpies of bicaret hydration and dilution of its aqueous solutions at different temperatures
Thermochimica Acta. 2014. V.590. P.145-150. DOI: 10.1016/j.tca.2014.05.011 WOS Scopus OpenAlex

≡ Web of science:	WOS:000340853100015
≡ Scopus:	2-s2.0-84903958190
≡ OpenAlex:	W2055893133