To
know the molecular interaction pattern between the IL 1-ethyl-3-methylimidazolium
bis(trifluoromethylsulfonyl)imide, [Emim][NTf2], and organic
solvent 2-propoxyethanol (2-PE), a detailed thermophysical study was
conducted at a temperature range of 298.15–318.15 K, over the
whole composition range of the mixture and atmospheric pressure. Further,
the excess parameters like excess molar volume (V
m
E), excess
isentropic compressibility (κs
E), excess isobaric thermal expansion coefficient
(αP
E),
deviation in refractive index (Δ⌀
n
D), and partial molar quantities are obtained from the
experimental values. To confirm the excess parameters obtained from
the experimental values, these were checked with Redlich–Kister
polynomial type equation. It was observed that in the binary system
of [Emim][NTf2] and [2-PE] there are strong attractive
forces at the IL-rich region. Finally, the microscopic interactions
were also confirmed with ATR-FTIR spectra and molecular dynamics simulation
studies.