Dielectric constants, refractive indexes and polarizations for 1‐Alcohol +Heptane mixtures at 298.15 and 308.15 K

Abstract

New experimental data on dielectric constants, refractive indexes for the binary mixtures of heptane + 1‐pentanol, + 1‐hexanol, + 1‐heptanol, + 1‐octanol, 1‐decanol and + 1‐dodecanol at 298.15 and 308.15 K are reported. The molar and orientation polarizations were calculated for the pure and mixture components. The excess dielectric functions were estimated. The variation of correlation factor and free energy of mixing has been examined over the whole range of 1‐alcohol mole fractions for all the binary mixtures. The results are interpreted in terms of molecular interactions.

Determination and Prediction for the Polarity of Ionic Liquids

“…The relative permittivity ε r is the crucial parameter in the molecular solvent system and it usually can be used to measure the polarity of molecular solvents. In this work, the values of refractive index, n D , molar volume, V m , and Δ l g H m o (298) were collected from the literature, − and according to eqs – δ μ of some molecular solvents were obtained. These are listed in Table , and the corresponding relative permittivity ε r for these molecular solvents were collected − and also listed in Table .…”

Thermodynamics of mixtures with strongly negative deviations from Raoult's law. XV. Permittivities and refractive indices for 1-alkanol + n -hexylamine systems at (293.15–303.15) K. Application of the Kirkwood-Fröhlich model

“…In the first case, the contribution to E r ε is positive, whereas in the second case it is negative. 1-Alkanol + heptane mixtures show rather large negative values of this quantity (Figure 4): E r ε = -1.075 (n = 3), -2.225 (n = 4), -2.525 (n = 5), -2.875 (n = 7), -1.775 (n = 10) [12,[38][39][40].…”

Application of a new theoretical procedure for calculating Kirkwood correlation factors in alkanol + hexane and alkanol + pentane mixtures

“…The procedure for calculating the summation terms is more complicated than in case of the simple linear model but the algebraic operations resemble the ones used for deriving eqn (20). The relationship between f 1 and F A modified by the extended assumptions mode in eqn (23) to give (see ref. 7)…”

“…3 There is a considerable number of authors and research groups who have dealt with the experimental determination of Kirkwood factors g K of alcohol + hydrocarbon and also alcohol + CCl 4 mixtures including pure alcohols. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Early attempts to develop a statistical theory of g K based on Wertheim's model of rigid dipoles have been made by Winkelmann and Quitzsch. 28 However, no consistent and successfully working molecular theory exists up to now for describing g K simultaneously with other physical properties of alcohol + inert solvent mixtures such as thermodynamic excess functions and spectroscopic data taking into account the chain-like association of alcohol molecules.…”