Abstract
Herein, we have demonstrated the preparation of deep eutectic solvents (DESs) using ammonium iodides and iodine. Binary mixtures of 10 ammonium iodides with iodine were examined, and methylammonium iodide [MeNH3]I, diethylammonium iodide [Et2NH2]I, butylammonium iodide [BuNH3]I, and dibutylammonium iodide [Bu2NH2]I formed liquid DESs when mixed with iodine within specific concentration ranges. The DESs showed high electrical conductivities, which increased with the iodine concentration. Among the DESs studied here, [MeNH3]I/I2 with the molar ratio of 1:2.5 showed a very high electrical conductivity (approximately 100 mS cm−1 at 298 K). Overall, the viscosity of the DES series decreased with increasing iodine concentration. The Walden plot showed that most DESs studied here were good electrical conductors, whereas [Bu2NH2]I/I2 DESs with the molar ratios of 1:0.75 and 1:1.00 were almost ideal electrical conductors. Raman spectra of the DESs [Bu2NH2]I/I2 mixtures showed the presence of polyiodides; thus the high electrical conductivity of the DESs in this study was attributed to the Grotthuss mechanism.
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