Insight into the solute-solvent interactions by physicochemical and excess properties in binary systems of the ether- and allyl-based functionalized ionic liquids with acetonitrile

•The ether- and allyl-based functionalized ionic liquids [C1OC2pyrr][DCA], [C1OC2pyrr][NTf2] and [Amim][NTf2] were synthesized and characterized.•The excess properties αpE and VE values are all negative, which could be interpreted in terms of H-bonding interaction and structural effect, and ΔnD findings are also well supported by the results.•The molar refraction, Rm and the molar polarizability α, which suggest that the existent interactions between ILs and acetonitrile are ion-dipole interactions.