Conductivity studies on some alkali metal iodides in aqueous N,N-dimethylformamide solutions at 298.15K

Conductance studies of NaCl, KCl, NaBr, KBr, NaI, Bu4NI, and NaBPh4 in water + 2-propoxyethanol mixtures at 298.15 K

“…2b-f). It seems that such a way of explaining the conductivity properties of ions in aqueous-organic mixtures has been also partially confirmed by the results of our previous work on the conductivity measurements in the mixtures of water+ N,N-dimethylformamide [8][9][10][11][12], as well as by the results of conductivity measurements in water+HMPT mixtures [27]. However, the authors of the paper [27] do not analyze their results in a way presented by us.…”

“…Such character of changes Fig. 1 Walden product Λ o ·η· 10 −2 [S·cm 2 ·mol −1 ·mPa·s], of NaBr, NaI, KCl, NaBPh 4 , and NBu 4 I as function of the mole fraction, x 2 , in water (1)+2-propoxyethanol (2) mixtures at 298.15 K: empty diamonds NaCl, empty squares NaBr, empty triangles NaI, filled triangles KCl, filled squares NaBPh 4 , and filled diamonds NBu 4 I in the value of R was observed by us in all studied waterorganic solvent mixtures [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. This may be due to the incorporation of solvent molecules between the ions forming the ion pair, both in terms of number and size of these molecules.…”

“…1.Figure 1shows that in the case of electrolytes containing small ions, i.e., NaCl, NaBr, NaI, and KCl, dependencies Λ o η=f(x 2 ) are characterized by a distinct maximum for the content of about 0.10 mol fraction of propoxyethanol.In the case of electrolytes containing large ions BPh 4 − and Bu 4 N + , the values of Λ o η are much smaller and the impact of the content of propoxyethanol on the value of Walden's product is small. An almost similar character in the changes of value of Walden's product as a function of the composition in mixtures having a high water content has been observed for the mixtures of water + alcohol[1][2][3][4][5][6][7] and water + alkoxyethanol[13][14][15][16], and also partially for the mixtures of water+N,N-dimethylformamide[8][9][10][11][12]. The changes in Λ o η values depend on the changes in the effective ionic radii of the cation and anion.…”

“…This work is a continuation of our investigations of electrolyte solutions in mixed solvents (water-alcohol [1][2][3][4][5][6][7], water-amide [8][9][10][11][12] and water-alkoxyethanol [13][14][15][16]). …”

Complex formation of crown ethers with cations in the (water+organic solvent) mixtures. Part VI. Thermodynamic of interactions of Na+ ion with benzo-15-crown-5 ether in {(1−x)DMF+xH2O} at 298.15 K

“…The ion association of NaI of the Bjerrum type is negligible (K A ¼ 0 [28] and K A ¼ 6 [29,30]) because of the high enough dielectric permittivity of {ð1 À xÞ DMF + xH 2 O}, it change from 37.62 in pure DMF [31] to 78.3 in pure water as well as by the reason of solvation capabilities of DMF [32][33][34].…”