Molar excess enthalpies of ethanol, 1-propanol, 2-propanol and 1-butanol + 1-butyl-3-methyl-imidazolium hexafluorophosphate, [bmim]PF6 at highly diluted region of organic solvents were determined using isothermal titration calorimeter (ITC) at 288.15, 298.15, 308.15 and 318.15 K. The experimental data were fitted with a Redlich-Kister equation. The partial molar excess enthalpies at infinite dilution, h(i)(E,infinity) were calculated using the parameters of the Redlich-Kister equation. (c) 2007 Elsevier B.V. All rights reserved.