Density and viscosity behaviour of EBPBF4, TBPBF4 and HBPBF4 in acetonitrile solutions at different temperatures at T = (293.15–323.15) K

•Densities and viscosities of EBPBF4, TBPBF4 and HBPBF4 in AN were measured at different temperatures.•Some thermodynamic parameters obtained to analyze the interaction between solutes and solvents.•The change of dB/dT indicates the decreasing hydrodynamic volume of ions with increasing temperature.•The larger values of Eη and Δμ20≠-Δμ10≠ indicates that the movement of long chain salts is more difficult in AN solutions.•To understand ion and solvent interactions in new electrolyte systems is helpful to promote their commercial application.