Isotope effects on thermodynamic properties: mixtures of x(D2O or H2O) + (1 − x)CH3CN at 298.15 K

Molar heat capacities of the (water+acetonitrile) mixtures at T=(283.15, 298.15, 313.15, and 328.15)K

“…The excess molar heat capacities for mixtures at different temperatures are recorded in table 1. The C E p values obtained at T = 298.15 K are compared with the literature data [10][11][12] For other binary systems of (acetonitrile + amides) [1,2] and (acetonitrile + amines) [14], values of dC E p =dT are positive also.…”

“…The literature data about heat capacities of (water + acetonitrile) mixtures [10][11][12] are limited at T = 298.15 K.…”

“…FIGURE 1. Plot of excess molar heat capacity against mole fraction for {water (1) + acetonitrile (2)} at T = 298.15 K. j, from[12]; 4, from[11]; h, present work and N, from[10].…”

D2O–H2O solvent isotope effects on the volumetric properties of aqueous 1,3-dimethyl-2-imidazolidinone between (278.15 and 318.15)K

“…The dashed lines limit the halfwidth of the confidence interval (±f [50]) for quantities considered. 1 According to Ivanov, Hawrylak and co-workers [47][48][49], the quantity V E;1 2 ¼ V 1 2 ð V 1 /;2 Þ À V 2 has a meaning of the standard volumetric effect of solution, D sol V 1 2 ð D sol V 2 Þ, that characterizes the change in the volume for the isobaricisothermic process of replacement of the environment of a solute molecule composed of like molecules by infinitely large number of solvent molecules.…”

“…Usually, in going from one solvent to another, the changes of molecular shape and local liquid structure are so substantial that thermodynamic or other characteristics of the solute have to be considered virtually on an individual basis for each solvating medium compared. Some of the difficulties are avoided if thermodynamic properties of the solute or/and solution are examined in H 2 O and D 2 O, and solvent isotope effects in such properties then give useful information on both the structure-related differences between ordinary and heavy water and the interactions between the solute and H/D isotopically distinguishable solvents [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”