Solvate Complex LiAlCl4·SO2: Synthesis and Physical-Chemical Properties

• Published in: The journal of physical chemistry. B 2024-12, Vol.128 (48), p.11955-11962
• Main Authors: Golubyatnikova, Ludmila G., Mishinkin, Vadim Yu, Garipov, Dmitrii R., Yusupova, Alfia R., Kolosnitsyn, Dmitrii.V., Kuzmina, Elena V., Kolosnitsyn, Vladimir S.
• Format: Article
• Language: English
• Subjects: B: Liquids; Chemical and Dynamical Processes in Solution
• ISSN: 1520-6106; 1520-5207; 1520-5207
• DOI: 10.1021/acs.jpcb.4c06011

This work describes the synthesis of the LiAlCl4·SO2 solvate complex and its properties. Its composition was determined using thermogravimetric analysis, Raman spectroscopy, and UV–vis spectroscopy. The specific ionic conductivity of LiAlCl4·SO2 is 4.7 × 10–2 S·cm–1. 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 LiAlCl4·SO2 were determined by simultaneous thermogravimetric analysis and differential scanning calorimetry. The structure of the solvate complex LiAlCl4·SO2 has been studied using a molecular dynamics method. A lithium cation is coordinated by one atom of Cl of the anion AlCl4 – and one oxygen atom of SO2. The coordination number of lithium ions of LiAlCl4·SO2 is 4. The lithium cation is coordinated by three anions of AlCl4 – and one molecule of SO2. Anion AlCl4 – acts as a bridging ligand and binds different lithium cations.