Arijit Bhattacharjee

Apparent molar volume, viscosity B -coefficient, and adiabatic compressibility of tetrabutylammonium bromide in aqueous ascorbic acid solutions at T = 298.15, 308.15, and 318.15 K

Apparent molar volumes ϕν and viscosity B-coefficients for tetrabutyl ammonium bromide (TBAB) in (0.00, 0.05, 0.10, and 0.15) mol dm−3 aqueous ascorbic acid solutions have been determined from solution density and viscosity measurements at temperatures over the range 298.15 to 318.15 K as function of concentration of ascorbic acid solutions. In the investigated temperature range, the relation: ϕν0 = a0 + a1T + a2T2, have been used to describe the partial molar volume ϕν0. These results, in conjunction with the results obtained in pure water, have been used to calculate the standard volumes of transfer Δϕν0 and viscosity B-coefficients of transfer for TBAB from water to aqueous ascorbic acid solutions for rationalizing various interactions in the ternary solutions. The structure making or breaking ability of TBAB has been discussed in terms of the sign of (δ2ϕν0/δT2)P. An increase in the transfer volume of TBAB with increasing ascorbic acid concentration has been explained by Friedman-Krishnan co-sphere model. The activation parameters of viscous flow for the ternary solutions studied have also been calculated and explained by the application of transition state theory.

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.

Study on molecular interactions by antagonism, synergy and excess functions of ternary mixtures of tetrahydrofuran with dimethylsulphoxide and monoalkanols

The densities and viscosities of eight ternary mixtures of tetrahydrofuran, dimethylsulphoxide and monoalkanols: methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, amyl alcohol and i-amyl alcohol are determined over the entire range of composition at 298.15 K. From the experimental measurements, excess molar volumes (V E), viscosity deviation (Δη), antagonism and antagonic index (I A) are derived by the equations developed by Kalentunc-Gencer, Peleg and Howell, respectively. A power factor, Fη , has also been introduced here. Also, the speeds of sound of these ternary mixtures have been measured over the whole composition range at the same temperature and thus, the isentropic compressibility (K S) and excess isentropic compressibility ( ) have been evaluated from the experimental data. The results are discussed in terms of molecular packing, specific interactions and nature of liquid mixtures. The systems studied here exhibit very strong cross association through hydrogen bonding.