The Viscosity B‑Coefficientsand the ExcessGibbs Energy of Activation for Viscous Flow of the Dilute Solutionsof [EtOheim][SCN] in Molecular Solvents

In this work, the hydroxyl-functionalized ionic liquid [EtOHEIm][SCN] was synthesized and characterized by ¹H NMR, ¹³C NMR, and IR. A scientific study of the viscosity of three dilute solutions (<i>m</i> = 0.0300–0.3000 mol·kg^–1) of 1-hydroxyethyl-3-ethyl imidazole thiocyanate [EtOHEIm][SCN] in water, acetonitrile, and ethanol was carried out in the temperature range from 293.15 to 318.15 K at 0.1 MPa. The viscosity deviation, Δη, relative viscosity, η_r, and excess Gibbs energy of activation for viscous flow of mixtures, Δ<i>G</i>^≠E proposed by our team, were obtained, and the related entropy and enthalpy were also discussed. The fitted coefficients of <i>A</i> and <i>B</i> from the Jones–Dole equation were applied to analyze and explore the interaction between [EtOHEIm][SCN] and solvents.