Abstract
A semi-molecular theory has been employed to predict temperature dependent Stokes shift dynamics of a dipolar probe in sodium 2,5,8,11-tetraoxatridecan-13-oate ([Na][TOTO]), and compared with imidazolium ionic liquids (ILs). Predicted dynamic Stokes shift for [Na][TOTO]is ∼60–70% of that calculated for imidazolium ILs. The calculated biphasic dynamics is, however, extremely slow because of large viscosity, average solvation time (〈τss〉) being in ∼1s–10ns range at 254⩽T/(K)⩽344. This is much slower than those in imidazolium ILs (0.1⩽〈τss〉/ns⩽6 at 278⩽T/(K)⩽338). Predicted temperature dependence of shift is very weak and suggests near-Arrhenius behavior for the dynamics.
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