Densities,
ρ, speed of sound, c, and refractive
indices, n, were measured for the binary mixtures
of 1-butyl-3-methylimidazolium thiocyanate ([BMIM][SCN]) + 2-propanol,
2-butanol, 2-pentanol, and 2-hexanol over the whole range of compositions
at temperatures (288.15–338.15) K at intervals of 10 K and
ambient pressure (81.5 kPa). A number of mixing rules were evaluated
for the refractive index data.
Excess molar volume, V
m
E, temperature-averaged excess molar isobaric
expansion, A
E, isothermal pressure coefficient
of excess molar enthalpy, (∂H
m
E/∂P)
T,x
, and
excess molar isentropic compressibility, K
S
E, were derived
from the experimental data. The V
m
E and K
S
E data were found
to be negative for all binary mixtures. V
m
E and K
S
E were fitted
by the Redlich–Kister equation. The temperature dependence
of these excess quantities was also inspected and, where available,
compared to literature data of related binary systems. The results
were analyzed to discuss the nature and strength of intermolecular
interactions.