Densities and conductivities of seven 1-allyl-3-methylimidazolium carboxylate ionic liquids

In the present work, seven 1-allyl-3-methylimizodalium carboxylate ionic liquids (ILs), including 1-allyl-3-methylimizodalium formate [Amim][HCOO], acetate [Amim][CH3COO], propionate [Amim][CH3CH2COO], butyrate [Amim][CH3(CH2)2COO], glycollate [Amim][HOCH2COO], lactate [Amim][CH3CHOHCOO]) and benzoate [Amim][C6H5COO], have been synthesized and characterized. Density (ρ) and conductivity (σ) have been determined experimentally for these ILs at 298.15 K and atmospheric pressure. Then molar volume (Vm), standard entropy (S°), lattice energy (UPOT) and molar conductivity (Λ) of the ILs have been derived from the density and conductivity data. Ionicity of the ILs has been estimated using the Walden plot. Meanwhile, how anionic structure of the ILs affects the volumetric and conductivity properties of 1-allyl-3-methylimidazolium carboxylate ILs has been discussed from the analysis of structure-property relationship.