This work describes the synthesis of the LiAlCl·SO solvate complex and its properties. Its composition was determined using thermogravimetric analysis, Raman spectroscopy, and UV-vis spectroscopy. The specific ionic conductivity of LiAlCl·SO is 4.7 × 10 S·cm. The dynamic viscosity is 19 cP at 25 °C, and the lithium transference number is 0.78. The melting point (+2.5 °C) and decomposition temperature (+60 °C) of LiAlCl·SO were determined by simultaneous thermogravimetric analysis and differential scanning calorimetry. The structure of the solvate complex LiAlCl·SO has been studied using a molecular dynamics method. A lithium cation is coordinated by one atom of Cl of the anion AlCl and one oxygen atom of SO. The coordination number of lithium ions of LiAlCl·SO is 4. The lithium cation is coordinated by three anions of AlCl and one molecule of SO. Anion AlCl acts as a bridging ligand and binds different lithium cations.
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