Volumetric and ultrasonic properties of ionic liquids (ILs), 1-butyl-3-methylimidazolium tetrafluoroborate [C(4)mim][BF4], 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide [C(4)mim][NTf2] and 1-butyl-3-methylimidazolium methylsulfate [C(4)mim][C1OSO3] with 1,2-propanediol (1,2-PD) have been investigated using density, rho speed of sound, u measurements over the entire composition range at T = (293.15, 298.15, 303.15, 308.15, 313.15, and 318.15) K. The density values were used to calculate excess molar volume, v(m)(E) whereas speed of sound results have been used to calculate deviation in isentropic compressibility, Delta kappa(S). Excess properties have been fitted to the Redlich-Kister polynomial equation to obtain the binary coefficients and the standard deviations. Spectroscopic technique like Fourier transform infrared (FT-IR) has been utilized for analyzing molecular level interaction prevailing between the binary mixtures. FT-IR technique has been used to scrutinize the -OH interactions between the binary mixtures and the influence on the structural variations in the ionic liquid. The excess properties and spectroscopic data have been analyzed in terms of the effect of temperature and the change of the anion of ionic liquid. (C) 2015 Elsevier B.V. All rights reserved.