Descripción
In this study, measurements regarding the density and speed of
sound for binary liquid mixtures of the 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) ionic liquid (+ methanol, or + acetonitrile, or +
tetrahydrofuran, or + formamide, or + N,N-dimethylformamide, or + dimethylsulfoxide) were carried out as a function of the composition at temperatures
between 288.15 and 313.15 K and atmospheric pressure. Experimental results
allowed us to calculate the excess molar volume, Vm
E, and excess isentropic compressibility, κs
E
, which were fit to a Myers−Scott-type polynomial. The results for
the studied systems suggest that structural effects and chemical interactions must
predominate over other possible effects, except for the system containing
formamide in which physical effects may also be more important.
