A novel asymmetrical gemini ionic liquid, 1-(3-(trimethylammonio)prop-1-yl)-3-methylimidazolium bis (dicyanamide) ([N111C3MIM][N(CN)(2)](2)), was synthesized and characterized by H-1 NMR, C-13 NMR. Thermal stability of [N111C3MIM][N(CN)(2)](2) was investigated through thermogravimetric analysis under pure nitrogen atmosphere. Heat capacity of pure [N111C3MIM][N(CN)(2)](2) was measured using differential scanning calorimetry in the temperature range 298.15-423.15 K and enthalpy H-T-H-298.15K, and entropy S-T-S-298.15K were obtained. Densities and viscosities were measured for the binary system of [N111C3MIM][N(CN)(2)](2) and isopropanol (IPA) over the entire range of mole fractions at various temperatures from 283.15 to 333.15 K under the pressure of 0.101 MPa. Moreover, the excess molar volumes (V-m(E)) and the viscosity deviations (Delta eta) for the binary mixtures were determined and well fitted to the Redlich-Kister polynomials. The negative values of V-m(E) and Delta eta result from strong self-association and weak hydrogen bonding interaction between the molecules of [N111C3MIM][N(CN)(2)](2) and IPA. Excess Gibbs energy of activation (Delta G*(E) ) of viscous flow for the present binary mixtures were also calculated. Results have been discussed in terms of molecular interactions and structures. (C) 2019 Elsevier Ltd.