Physical and Electrochemical Properties of Room-Temperature Ionic Liquids Containing Allyl-Based Phosphonium Cations and Bis(fluorosulfonyl)amide Anion

摘要

The physical and electrochemical properties of room-temperature ionic liquids based on quaternary phosphonium cations containing an allyl group in combination with bis(fiuorosulfonyl)amide anion. It was found that the allyl-based phosphonium RTILs showed lower melting points, lower viscosities and higher conductivities than those of the unsubstituted phosphonium and the corresponding ammonium RTILs. The allyl-based phosphonium RTILs with bis(trifluoromethyl-sulfonyl)amide anion exhibited relatively high thermal stability when compared to the corresponding bis(fluorosulfonyl)amide anion based RTILs. The electrochemical stability tended to be more or less reduced by introducing the allyl group.