Ionic liquids, also known as room temperature ionic liquids, room temperature molten salts, organic ionic liquids, etc., refer to salts that are liquid at room temperature or low temperature only composed of ions. With the deepening of the research and application of ionic liquids, the designability of ionic liquids has brought new opportunities for the application and development of various fields. Among many types of ionic liquids, most of the cations of ionic liquids have nitrogen atoms, phosphorus atoms and sulfur atoms as the central atoms. Among them, cation ionic liquids with sulfur atoms as the central atom are rarely studied. Sulfonium-based ionic liquids are mostly trialkylsulfoniums, which have the advantages of low viscosity, high conductivity, and strong stability, and have a wide range of applications in the electrochemical field.
Figure 1. Structure of sulfonium-based ionic liquids
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