Refractive Index and Related Properties for the Binary Mixture (1,4-Dioxane + Chloroform) at T = (295.15, 298.15, 301.15, 304.15, 307.15, 310.15, and 313.15) K

For the binary mixture (1,4-dioxane (1) + chloroform (2)), the refractive index (nD) was measured at temperatures T = (295.15, 298.15, 301.15, 304.15, 307.15, 310.15, and 313.15) K and at atmospheric pressure over the whole composition range. The molar refraction (Rm), reduced molar free volumes (Vm/Rm), molecular radius (r), internal pressure(Pint), and their excess properties were calculated from experimental data. These values were then analyzed to determine the type and nature of specific intermolecular interactions among the components. The refractive indices of the binary mixture were calculated using nine different mixing rules (Gladstone–Dale, Arago–Biot, Weiner, Heller, Lorentz–Lorentz, Eykmen, Eyring–John, Oster, and Newton), and the results were compared with experimental measurements at each temperature. The nature of the molecular interactions was explored by analyzing the thermodynamic properties, specifically by fitting the excess parameters to the Redlich–Kister polynomial equation to derive the corresponding coefficients and standard errors.