Molecular interaction studies of binary mixture formed by 2-methoxyethanol and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide-based ionic liquid

ABSTRACT

Physicochemical properties such as density (ρ), speed of sound (u) and refractive index (n_D) for binary mixture of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide with 2-methoxyethanol (2-ME), have been investigated over the whole composition range at different temperatures (298.15–318.15) K and ambient pressure. Additionally the excess properties such as excess molar volume ($V_m^E$), excess molar isentropic compressibility (${\kappa }_{S,m}^E$), excess isobaric thermal expansion coefficient (${\alpha }_P^E$), deviation in refractive index (${\mathrm{\Delta }}_{\varphi }{n}_D$) and partial molar quantities, have been also evaluated, simultaneously these are fitted with Redlich-Kister type equation for acquiring the binary coefficients and standard deviations. The calculated data has been interpreted in terms of various interactions and structural property between organic and ionic liquid molecules upon mixing. ATR-FTIR studies also carried out to know the microscopic interactions. The experimentally obtained excess molar volumes are further analysed with the help of Prigogine-Flory-Patterson (PFP) theory.

KEYWORDS:

• [Emim][NTf₂]
• 2-methoxyethanol
• excess thermodynamic parameters
• ATR-FTIR
• PFP theory

Disclosure statement

No potential conflict of interest was reported by the authors.