Volumetric and compressibility properties of liquid water as a solute in glycolic, propylene carbonate, and tetramethylurea solutions at T=298.15K

Water as a solute in nitromethane: Effect of H2O–D2O isotope substitution on the solution volumetric properties between 278.15K and 318.15K

“…Such an unusual situation is characteristic also for water as a solute in propylene carbonate (PC, V 1 2 is found equal from 18.2 cm 3 Á mol À1 [7,64] [66] at T = 303.15 K) being, like NM, the predominantly electronaccepting solvents [24]. Qualitatively, this was explained in terms of either the specific H-bonding interaction with the oxygen of the solvent molecule [7,66] or the decrease in cohesive energy density, (D vap H°À RT)V À1 where D vap H°is the molar enthalpy of vaporization, accompanying the transfer of a water molecule from pure water to the solvent [65]. However, it is necessary to take into consideration that the specified positive volume effect was not found for H 2 O and D 2 O dissolved in acetonitrile (AN, V E;1 2 < 0 [4,12,67]) having the similar (with the above solvents) acceptor-donor nature [24].…”

“…0. Note also that the ''slope parameter" S V in equation (5), by analogy with aqueous solutions, can be source of certain information on the nature of both solute-solvent and solute-solute interactions [4,7].…”

“…Water dissolved in the aprotic dipolar solvent present a rare opportunity for studying both the state and specific features of solute molecules being hydrogen-non-bonded in the three-dimensional network characteristic of the ''pure" aqueous component and the nature of their effect on the structure and thermodynamic properties of the surrounding (solvating) medium [1][2][3][4][5][6][7]. Here, the point is that the aprotic dipolar solvent is such a dissolving medium, whose structural packing contains molecules that do not form strong hydrogen bonds (due to the absence of proton-donating centers) but allows sufficiently strong specific interactions (via H-bonding) with molecules of an electron-accepting protic solute, which in this case is water [3].…”

“…At the same time, although thermodynamics does not yield directly the structural aspects of the intermolecular interaction, one can derive meaningful inferences from thermodynamic properties such as partial volume and enthalpy function as well as their derivatives (partial expansibility, compressibility and heat capacity) indirectly [2][3][4]7,8]. From this viewpoint, approaches that cause ''minimal perturbation" of a solution structure seem to be most informative for the specified thermodynamic studies.…”

Phenomenon of “negative partial molar expansibility” of water in tetrahydrofuran: How plausible is it?

“…Here, b V has a meaning the ''slope parameter" that, by analogy with aqueous solutions, can be source of certain information on the nature of soluteÀsolvent and soluteÀsolute interactions [35,43]. From equation (2) follows that V/;w !…”