Apparent molar volumes and isentropic compressions of benzylalkylammonium ionic liquids in dimethylsulfoxide from 293.15 K to 328.15 K

Densities, rho and speeds of sound, u of four benzylalkylammonium ionic liquids (ILs), namely, benzylmethylammonium propionate (BMAP), benzylmethylammonium hexanoate (BMAH), benzyldimethylammonium propionate (BDMAP) and benzyldimethylammonium hexanoate (BDMAH) with dimethylsulfoxide (DMSO) have been determined as a function of ILs concentration, ranging from (0.1 to 0.8) mol kg(-1), at temperatures from 293.15 K to 328.15 K with 5 K interval and at atmospheric pressure. The apparent molar volumes, V-m, apparent molar isentropic compression, K-s,K-m and limiting apparent molar expansion, E-m(infinity) of the ILs have been calculated from the experimental density and speed of sound data. The Redlich-Mayer type of equation was fitted to the apparent molar volume and apparent molar isentropic compression data, to evaluate apparent molar volume at infinite dilution V-m(infinity) and apparent molar isentropic compression, K-m(infinity) at infinite dilution. (C) 2014 Elsevier B.V. All rights reserved.