Refractive properties and internal pressures of binary mixtures of octan-1-ol with chloroform, 1,2-dichloroethane and 1,1,2,2-tetrachloroethane at 298.15 and 308.15 K

Abstract

Refractive indices ( n D) of binary mixtures of octan-1-ol with chloroform, 1,2-dichloroethane (DCE) and 1,1,2,2-tetrachloroethane (TCE) have been determined at 298.15 and 308.15 K and at atmospheric pressure for the whole composition range. Absolute synergies of refractive index (Δ n D), relative synergies of refractive index ( I n), reduced molar free volumes ( V m/ R m), Eykman's constants ( C m), molar refractions ( R m), internal pressures ( P int), molecular radii ( r m) and the deviations of reduced molar free volumes Δ( V m/ R m), Eykman's constants (Δ C m) and molecular radii (Δ r m) have been determined from the experimental refractive index and density data at 298.15 and 308.15 K. These quantities have been fitted to the Redlich–Kister polynomial equation and the results analyzed in terms of molecular interactions and structural effects. Refractive indices have been compared with those predicted by several mixing rules: Lorentz–Lorenz, Gladstone–Dale, Arago–Biot, Wiener, Heller, Laplace and Eykman. Finally, a linear relation between van der Waal's parameter ( b) and molar refraction ( R m) has been provided and the refractive indices have been predicted in terms of root mean square deviations.