Department of Materials Science, Wakayama National College of Technology, 77 Noshima, Nada-cho, Gobo, Wakayama 644-0023, Japan.
J Phys Chem B. 2009 Dec 3;113(48):15870-4. doi: 10.1021/jp908356c.
The physicochemical properties of two novel ionic liquids based on benzyltriethylphosphonium and benzyltributylphosphonium cations are described in this report. It was found that both benzyl-substituted phosphonium cations gave low-melting salts in combination with a bis(trifluoromethylsulfonyl)amide anion. The thermogravimetric analysis suggested that the benzyl-substituted phosphonium ionic liquids showed higher thermal stability than those of not only the alkyl-substituted phosphonium ILs but also the corresponding benzyl-substituted ammonium compounds. The benzyl-substituted phosphonium ionic liquids also exhibited relatively high conductivities when compared to those of the corresponding ammonium compounds. These results indicate an improving effect of introducing a benzyl group into the phosphonium cations on both the thermal stability and the conductivity.
本报告描述了两种基于苄基三乙基膦和苄基三丁基膦阳离子的新型离子液体的物理化学性质。结果发现，两种苄基取代的膦阳离子与双（三氟甲基磺酰）酰胺阴离子形成低熔点盐。热重分析表明，与烷基取代的膦 ILs 以及相应的苄基取代的铵化合物相比，苄基取代的膦离子液体具有更高的热稳定性。与相应的铵化合物相比，苄基取代的膦离子液体也表现出较高的电导率。这些结果表明，在膦阳离子中引入苄基基团对热稳定性和电导率都有改善作用。
