Abstract
In the present study, we demonstrate the facile preparation of deep eutectic solvents (DESs) composed of various imidazolium iodides and iodine. The electrical conductivity of the DESs was high and was controllable by changing the composition of the mixtures and the imidazolium cation species. In particular, the DES composed of 1-ethyl-3-methylimidazolium iodide and iodine in a 1:4 molar ratio showed an electrical conductivity as high as 70 mS cm−1, which was higher than that of ionic liquid (1-butyl-3-methylimidazolium iodide and 1-hexyl-3-methylimidazolium iodide) mixtures with iodine. The electrical conductivity of DESs based on 1-alkyl-3-methylimidazolium iodides increased with increasing iodine content. The high electrical conductivity of DESs was attributed to the Grotthuss mechanism in polyiodide based on the viscosity results, Raman spectrum measurements, and quantum chemistry calculations.
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