Ionic
liquids (ILs) gained a lot of attention, from both academe
and industry, as alternative liquids for different types of applications.
Chemical and physical characteristics can be designed with the large
availability of cation and anions. Experimental measurement of all
these systems is not practically feasible, hence requiring the use
of a computational predictive model study. This work evaluates the
prediction of the activity coefficient (γ
s
∞) at infinite
dilution in several classes of ILs using the conductor-like screening
model for real solvents (COSMO-RS), a model based on unimolecular
quantum chemistry calculations. Comparison of the experimental γ
s
∞ value with COSMO-RS predicted data is carried out, and absolute
average relative deviation was determined to be 24.1%, indicating
that the COSMO-RS model presents a reliable prediction to determine
γ
s
∞ in a wide range of ILs. The observation also confirms
that polarizability of ILs plays a crucial role in their interaction
with thiophene. With respect to cation impact, it is more evident
to state that γ
s
∞ decreases with increasing the
cation size. The results shown here help in understanding of IL–thiophene
interactions. The effect of various structural features of ILs on
γ
s
∞ can be observed, which aids in the development of
various steps for the design of most suitable ILs with improved interaction
with thiophene.
The electrostatic – misfit energy arise from repulsive interaction of CH4 plays a dominant role in determining its solubility in ILs. Modelling using COSMO-RS shows that IL size and van der Walls forces only have marginal influences on CH4 solubility.
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