Excess molar volumes and refractive indices of binary mixtures of isopropylethanoate and symmetrical hydrocarbons at 308.15 K

Abstract

Densities and refractive indices of binary mixtures of isopropylethanoate with several symmetrical hydrocarbons viz cyclohexane, benzene, 1,4-dimethylbenzene and 1,3,5-trimethylbenzene at 308.15 K have been measured. The excess molar volumes (V E ) are evaluated from the measured density values for the four binary systems. Experimental refractive indices are used to evaluate deviation in refractive indices ( n) and molar refraction at experimental temperature. V E values are positive for the mixtures studied except binary mixtures between ester and 1,4-dimethylbenzene which have negative V E values. Standard deviations (V E ) and ( n) are also reported. Results are discussed in terms of molecular interactions between the components of the mixtures.Nous avons mesuré les densités et les indices de réfraction de mélanges binaires d'isopropyléthanoate avec plusieurs hydrocarbures symétriques, soit du cyclohexane, du benzène, du 1,4-diméthylbenzène et du 1,3,5-triméthylbenzèneà 308,15 K. Les volumes molaires excédentaires (V E ) ont etéévaluésà partir des densités mesurées pour les quatre systèmes binaires. Les indices expérimentaux de réfraction ont serviàévaluer l'écart des indices de réfraction ( n) ainsi que la réfraction molaireà la température expérimentale. Les valeurs des VEétaient positives pour les mélangeś etudiésà l'exception des mélanges binaires d'ester et de 1,4-diméthylbenzène qui présentaient des valeurs des VE négatives. Lesécarts type (V E ) et ( n) sontégalement indiqués. La discussion des résultats porte sur les interactions moléculaires entre les composants des mélanges.

Origin of Strong Synergism in Weakly Perturbed Binary Solvent System: A Case Study of Primary Alcohols and Chlorinated Methanes

“…Generally, solvent polarizability, H-bond donating ability (HBD) and H-bond accepting ability (HBA) or solvent basicity are three parameters which have been characterized to represent the variation of solute–solvent interactions. , All these parameters are solvatochromic parameter (represented like as π*, α, and β respectively, the Kamlet–Taft parameters) and provide information about the different mode of solvent interaction with the probe molecules in pure solvents and also in solvent mixtures. − Characterization of solvation behavior has been done employing various methods like conductance or transfer measurements, NMR chemical shifts, − vibrational spectroscopy, , UV–vis spectroscopy, − solvation dynamics, , etc. Refractive index measurements of binary solvent mixtures have also been to determine the quantitative information about the solvent–solvent interactions. , …”

Estimation of excess molar volumes and theoretical viscosities of binary mixtures of benzene + n-alkanes at 298.15 K

“…V E m values increase systematically (0.43031, 0.74732, 0.89911, 1.01524, 1.06634 and 1.19575 cm 3 mol -1 ) at benzene mole fraction (x 1 ) range (0.39880-0.43415) as chain length increases, indicating volume expansion upon mixing of higher n-alkanes with benzene. With increasing size of n-alkanes, volume expansion will be larger, indicating dispersion type of interactions between the component liquids [14].…”

“…The predicted values of viscosities of the binary mixtures, using Eqs. (13), (14), (16), (17), (18), (19) and (24), including standard deviation, at 298.15 K were compared with the experimentally measured values, and results are presented in terms of viscosity deviations (Dg) ( Table 5).…”

“…The interaction parameters of Eqs. (13), (14), (16), (17), (18), (19) and (24), along with APD and r values for all binary mixtures are presented in Table 6. A careful perusal of Table 6 The values of interaction parameters g 12 , H 12 , W/RT, G 12 and B 0 are presented in Table 6.…”

“…The order of interaction between benzene and n-alkanes follows the sequence: n-hexane\noctane \ n-decane \ n-dodecane \ n-tetradecane \ nhexadecane, i.e., the interaction increase with increasing chain length of the n-alkane. (14), (16), (17), (18), (19) and (24), APD values and standard deviations of binary mixture viscosities at 298. 15…”