水分含量对异辛基乙二胺-CF_3SO_3型质子化离子液体物理化学性质的影响
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摘要
通过对合成的异辛基乙二胺-CF3SO3[简称HEtHex(TFS)]型质子化离子液体进行FT-IR红外谱图、13 C-NMR谱图测定及CHN元素分析,鉴定了其结构特征和纯度.在常压下相同的温度范围T=(303.15～353.15)K内,不同含水量(质量百分含量)(0.53%,4.78%,6.00%,6.92%,7.97%,10.05%,14.83%,25.54%及54.99%)的条件下,测定了HEtHex(TFS)的密度、黏度及电导率,并用Arrhenius方程分别拟合了HEtHex(TFS)的黏度和电导率与温度之间的关系.通过Walden规则描述了其摩尔电导率和流动性之间的关系,结果显示,温度和水分含量对于HEtHex(TFS)的密度、黏度及电导率有着较大的影响.HEtHex(TFS)在相同的温度范围内,不同含水量条件下,随着温度的升高,黏度呈现指数形式的下降趋势,电导率则呈现指数形式的升高趋势.
The purity of PIL composed of 2-ethylhexylethylenediaminium cation and CF3 SO3 anion [HEtHex(TFS)]was measured using FT-IR,13 C-NMR spectra and CHN elemental analysis.The effects of water at different mass concentration(0.53%,4.78%,6.00%,6.92%,7.97%,10.05%,14.83%,25.54%及54.99%)on the physicochemical properties such as density,viscosity and electrical conductivity of HEtHex(TFS)were studied in the temperature range of T=(303.15-353.15)K.Temperature dependence of viscosity and conductivity was discussed on the basis of the Arrhenius equation,respectively.The relationship between molar conductivity and fluidity was described by the Walden rule.The results show that the effects of temperature and water content on the density,dynamic viscosity and electrical conductivity of HEtHex(TFS)are significant.The viscosity decreases and the conductivity increases with increasing water contents and temperature.
The purity of PIL composed of 2-ethylhexylethylenediaminium cation and CF3 SO3 anion [HEtHex(TFS)]was measured using FT-IR,13 C-NMR spectra and CHN elemental analysis.The effects of water at different mass concentration(0.53%,4.78%,6.00%,6.92%,7.97%,10.05%,14.83%,25.54%及54.99%)on the physicochemical properties such as density,viscosity and electrical conductivity of HEtHex(TFS)were studied in the temperature range of T=(303.15-353.15)K.Temperature dependence of viscosity and conductivity was discussed on the basis of the Arrhenius equation,respectively.The relationship between molar conductivity and fluidity was described by the Walden rule.The results show that the effects of temperature and water content on the density,dynamic viscosity and electrical conductivity of HEtHex(TFS)are significant.The viscosity decreases and the conductivity increases with increasing water contents and temperature.
引文
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[2]Wilkes S.Ashorthistoryofionicliquids-frommoltensaltstoneotericsolvents[J].Green Chem,2002,4(2):73-80.
[3]Hua E,Xu Y,Zhao H.Properties of mono-protic ionic liquids composed of hexylammonium and hexylethylenediaminium cations with trifluoroacetate and bis(trifluoromethylsulfonyl)imideanions[J].Journal of Molecular Liquids,2019,276:379-384.
[4] Iwasaki K,Yoshii K,Tsuda T,et al.Physicochemical properties of phenyltrifluoroborate-based room temperature ionic liquids[J].Journal of Molecular Liquids,2017,246:236-243.
[5]邓友全.离子液体介质与材料研究进展[J].中国科学院院刊,2005,10(4):297-300.
[6]关淑霞,于海南,邰永娜.离子液体的应用进展[J].化学工业与工程技术,2011,6(32):32-36.
[7]Greaves T L,Drummond C J.Protic Ionic Liquids:Properties and Applications[J].Chemical Reviews,2008,108(1):206-237.
[8]Poole C F.Estimation of Physicochemical Properties by Chromatographic and Electrophoretic Techniques[J].Journal of Chromatography A,2004,1037(1/2):49-82.
[9]Evans D F,Yamauchi A,Roman R,et al.Micelle formation in ethylammonium nitrate,a low-melting fused salt[J].Colloid and Interface Science,1982,88(1):89-96.
[10] Shetty P H,Poole S K,Poole C F.Applications of ethylammonium and propylammonium nitrate solvents in liquid-liquid extraction and chromatography[J].Analytica Chimica Acta,1990,236:51-62.
[11] Nakayama C,Harada M,Lida M.Properties of protic ionic liquids comprised of N-alkyldiethylenetriamine and their complexation of copper(II)ions[J].Eurjic Journal of Investigator Chemistry,2017,2017(31):3744-3754.
[12] Seddon K R,Stark A,Torres M J.Influence of chloride,water,and organic solvents on the physical properties of ionic liquids[J].Pureand Applied Chemistry,2001,72(12):2275-2287.
[13] Widegren J A,Laesecke A,Magee J W.The effect of dissolved water on the viscosities of hydrophobic room-temperature ionic liquids[J].Chemical Communications,2005,51(12):1610-1612.
[14] Hua E,Wang H.Properties of protic ionic liquids composed of N-alkyl(=hexyl,octyl and 2-ethylhexyl)ethylenediaminum cations with trifluoromethanesulfonate and trifluoroacetate anion[J].Journal of Molecular Liquids,2016,220:649-656.
[15]田鹏.离子液体的物理化学性质[J].沈阳师范大学学报,2011,29(2):130-138.
[16] Song X D,Kanazaki R,Ishiguro S,et al.Physicochemical and Acid-base Properties of a Series of 2-Hydroxyethylammonium-based Protic Ionic Liquids[J].Analytical Science,2012,28(5):469-474.
[17] Stoimenovski J,Izgorodina E I,Macfarlane D R.Ionicity and Proton Transfer in Protic Ionic Liquids[J].Physical Chemistry Chemical Physics,2010,12(35):10341-10347.