Refractive indices and static permittivities at temperatures of (283.15, 298.15, and 313.15) K and at pressure of 99.0 kPa were determined for the binary mixtures formed by n-hexane or n-heptane with isomeric chlorobutanes. Excess properties were obtained from the experimental values and correlated by means of a Redlich-Kister type equation. In addition, these results were used, together with available density values, to estimate at T = 298.15 K the Kirkwood correlation factors of the liquid mixtures. The behavior of this magnitude with composition was also discussed. (C) 2015 Elsevier Ltd. All rights reserved.