Kaneko Yoshiro
Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima, 890-0065, Japan.
Chem Rec. 2023 Aug;23(8):e202200291. doi: 10.1002/tcr.202200291. Epub 2023 Jan 26.
This paper describes the author's recent work on the preparation and properties of thermally stable ionic liquids (ILs) containing siloxane frameworks. Quaternary ammonium and imidazolium salt-type ILs containing random oligosilsesquioxane frameworks were successfully prepared via the hydrolytic condensation of the corresponding organotrialkoxysilanes by using an aqueous superacid bis(trifluoromethanesulfonyl)imide (HNTf ) solution as a catalyst and solvent. Imidazolium salt-type ILs containing polyhedral oligomeric silsesquioxane (POSS) frameworks were also prepared through a reaction similar to that described above by using a water/methanol mixed solution of HNTf . In addition, amorphous POSSs with two types of ionic groups randomly distributed in the side chain were prepared. These POSSs were ILs exhibiting fluidity at relatively low temperatures. Furthermore, imidazolium and ammonium salt-type ILs containing cyclic oligosiloxane frameworks were prepared through a reaction similar to that of the corresponding organodialkoxysilanes. The thermal decomposition temperatures of the above ILs containing siloxane frameworks were higher than those of general ILs.
本文描述了作者近期关于含硅氧烷骨架的热稳定离子液体（ILs）的制备及其性质的研究工作。通过使用超酸双（三氟甲磺酰）亚胺（HNTf₂）水溶液作为催化剂和溶剂，使相应的有机三烷氧基硅烷发生水解缩合反应，成功制备出了含有无规低聚硅倍半氧烷骨架的季铵盐型和咪唑盐型离子液体。还通过与上述反应类似的过程，使用HNTf₂的水/甲醇混合溶液制备出了含有多面体低聚倍半硅氧烷（POSS）骨架的咪唑盐型离子液体。此外，制备出了在侧链中随机分布有两种离子基团的无定形POSS。这些POSS是在相对较低温度下表现出流动性的离子液体。此外，通过与相应的有机二烷氧基硅烷类似的反应，制备出了含有环状低聚硅氧烷骨架的咪唑盐型和铵盐型离子液体。上述含硅氧烷骨架的离子液体的热分解温度高于普通离子液体。
