Thermal and transport properties of ionic liquids based on benzyl-substituted phosphonium cations.
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.
Tsunashima
Katsuhiko
K
Department of Materials Science, Wakayama National College of Technology, 77 Noshima, Nada-cho, Gobo, Wakayama 644-0023, Japan. tsunashima@wakayama-nct.ac.jp
Niwa
Eiko
E
Kodama
Shun
S
Sugiya
Masashi
M
Ono
Yasushi
Y
D002412:Cations / Q000737:chemistry; D002627:Chemistry, Physical; D004553:Electric Conductivity; D052578:Ionic Liquids / Q000737:chemistry*; D009943:Organophosphorus Compounds / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
D002412:Cations; D052578:Ionic Liquids; D009943:Organophosphorus Compounds