Anuradha Sinha

Studies of viscous antagonism, excess molar volume and isentropic compressibility in aqueous mixed solvent systems at different temperatures

Densities and viscosities for the ternary liquid mixtures of water + ethylene glycol +tetrahydrofuran, water + ethylene glycol + 1,4-dioxane, water + ethylene glycol + N,N-dimethylformamide and water + ethylene glycol + dimethyl sulphoxide have been measured as a function of the composition at 298.15, 308.15 and 318.15 K. From the experimental measurements, viscosity deviations (Δη), antagonic index (I A) and excess molar volumes (V E) have been evaluated. The speeds of sound have been also measured and excess isentropic compressibilities ( ) are calculated at 298.15 K. The results are discussed and interpreted in terms of molecular package and specific interaction predominated by hydrogen bonding.

Conductivity studies of sodium iodide in pure tetrahydrofuran and aqueous binary mixtures of tetrahydrofuran and 1,4-dioxane at 298.15 K

Electrical conductance measurements are reported for sodium iodide (NaI) in water + tetrahydrofuran (THF) and water + 1,4-dioxane binary mixtures at 298.15 K. The conductance data have been analyzed by the Fuoss conductance–concentration equation in terms of the limiting molar conductance (Λ 0), the association constant (K A) and the distance of closest approach of ions (R). Furthermore, the conductance data for pure THF have also been analyzed by the Fuoss–Kraus theory and the values of the ion-pair and triple-ion formation constants are calculated.

Ion-Solvent Interactions in Acrylonitrile Solutions of Some Tetraalkylammonium Halides Using FTIR Spectroscopy

The FTIR spectra of tetrapentylammonium bromide (Pe4NBr), tetrapentylammonium iodide (Pe4NI), tetrahexylammonium bromide (He4NBr), tetrahexylammonium iodide (He4NI), tetraheptylammonium bromide (Hp4NBr), and tetraheptylammonium iodide (Hp4NI) in pure acrylonitrile were observed at 0.1(M), 0.08(M), 0.05(M), and 0.02(M) concentrations. The region of immobilized solvent resulting from the structure-making effects of electrostriction increases with increase in charge-surface ratio of the ions. Cation-anion interactions are thus investigated by evaluating the frequency shifts of the solvent in the pure state upon complexation with the salt.