Partial Molar Volumes of 15-Crown-5 Ether in Mixtures of N,N-Dimethylformamide with Water

Abstract

The density of 15-crown-5 ether (15C5) solutions in the mixtures of N,N-dimethylformamide (DMF) and water (H2O) was measured within the temperature range 293.15–308.15 K using an Anton Paar oscillatory U-tube densimeter. The results were used to calculate the apparent molar volumes (VΦ) of 15C5 in the mixtures of DMF + H2O over the whole concentration range. Using the apparent molar volumes and Redlich and Mayer equation, the standard partial molar volumes of 15-crown-5 were calculated at infinite dilution (). The limiting apparent molar expansibilities (α) were also calculated. The data are discussed from the point of view of the effect of concentration changes on interactions in solution.

Partial Molar Volumes and Partial Molar Isentropic Compressions of 15-Crown-5 and 18-Crown-6 Ethers at Infinite Dilution in Water at Temperatures T = (278 to 343) K and Atmospheric Pressure

“…Measured standard molar volumes are compared in Table with the values found in the literature. Information on standard molar volume of 15-crown-5 ether is rather scarce. − Our value at T = 298.15 K agree within the experimental uncertainties with standard molar volumes reported by Tyczyńska and Jóźwiak and Høiland . At other temperatures the deviations are greater than the experimental uncertainties being both negative ,− and positive .…”

“…Information on standard molar volume of 15-crown-5 ether is rather scarce. − Our value at T = 298.15 K agree within the experimental uncertainties with standard molar volumes reported by Tyczyńska and Jóźwiak and Høiland . At other temperatures the deviations are greater than the experimental uncertainties being both negative ,− and positive . Our experimental data for temperatures (288.15, 298.15, and 313.15) K were tentatively recalculated using molalities uncorrected with respect to the content of water in the sample of pure 15-crown-5 ether (see Table ) and standard molar volumes by 0.11 cm 3 ·mol –1 higher were obtained.…”

“…Thus, it seem likely that one of the reasons for observed negative deviations might be the presence of small amounts of water in solute samples despite that some authors mentioned drying. On the other hand, rather large positive deviations from data at temperatures other than 298.15 K are difficult to explain.…”

“…15 At other temperatures the deviations are greater than the experimental uncertainties being both negative 9,11−14 and positive. 10 Our experimental data for temperatures (288.15, 298.15, and 313.15) K were tentatively recalculated using molalities uncorrected with respect to the content of water in the sample of pure 15-crown-5 ether (see Table 1) and standard molar volumes by 0.11 cm 3 •mol −1 higher were obtained. The values were still lower than literature data 9,11−14 but more close being within the limits of experimental uncertainties.…”

Thermodynamic and Thermal Analyze of N,N-Dimethylformamide + 1-Butanol Mixture Properties Based on Density, Sound Velocity and Heat Capacity Data

“…Densities (ρ) and sound velocities (u) of BuOH and DMF at pressure p = 0.1002 ± 0.005 MPa a . [41] 1477.0 1499 [18] 809.5 [42] 1256 [42] 948.747 [43] 809.53 [44] 1256.33 [45] 948.737 [46] 809.54 [19] 1256.55 [47] 948.611 [48] 809.58 [45] 1256.57 [44] 948.546 [49] 809.64 [50] 1260.4 [18] 948.584 [51] 809.664 [47] 948.67 [19] 809.7 [52] 948.73 [52] 809.78 [15] 948.653 [53] 809.79 [54] 809.8 [40] 809.94 [55] 298. 15 805.74 805.54 [39] 1239.5 1239.28 [56] 943.92 943.976 [41] 1457.4 1469.5 [57] 805.6 [16] 1239.29 [45] 805.73 [19] 1240.09 [58] 943.981 [43] 1457.69 [59] 805.76 [60] 1240.2 [61] 943.971 [46] 1458.5 [62] 805.77 [50] 1240.37 [63] 944.290 [59] 1457.49 [64] 805.79 [45] 1240.52 [47] 943.869 …”