Physicochemical Properties of Tri-n-butylalkylphosphonium Cation-Based Room-Temperature Ionic Liquids

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• 作者：Kazuki Yoshii ; Keisuke Yamaji ; Tetsuya Tsuda ; Katsuhiko Tsunashima ; Hiroyuki Yoshida ; Masanori Ozaki ; Susumu Kuwabata
• 刊名：Journal of Physical Chemistry B
• 出版年：2013
• 出版时间：December 5, 2013
• 年：2013
• 卷：117
• 期：48
• 页码：15051-15059
• 全文大小：426K
• 年卷期：v.117,no.48(December 5, 2013)
• ISSN：1520-5207

文摘

The physicochemical properties of novel four tri-n-butylalkylphosphonium-based room-temperature ionic liquids (RTILs), tri-n-butylmethylphosphonium dimethylphosphate ([P_4,4,4,1][DMP]), tri-n-butyl(2-hydroxymethyl)phosphonium bis(trifluoromethylsulfonyl)amide ([P_4,4,4,2OH][Tf₂N]), tetra-n-butylphosphonium O,O鈥?diethylphosphorodithioate ([P_4,4,4,4][DEPDT]), and tri-n-butyldodecylphosphonium 3,5-bis(methoxycarbonyl)benzenesulfonate ([P_4,4,4,12][MCBS]), were examined in this study. All RTILs showed a favorable thermal decomposition temperature exceeding 560 K. Of these, [P_4,4,4,12][MCBS] exhibited a fairly high thermal stability compared with common phosphonium cation-based RTILs reported to date. Interestingly [P_4,4,4,1][DMP] formed an ionic plastic crystal phase within a range of 279鈥?90 K, but that was not the case with [P_4,4,4,4][DEPDT], which is similar in the cation and anion structures to the [P_4,4,4,1]⁺ and [DMP]^{鈭?/sup>. [P_4,4,4,2OH][Tf₂N] showed a relatively high conductivity of 0.48 mS cm鈥? at 303 K among the RTILs consisting of tri-n-butylalkylphosphonium cation and usual fluoroanion.}