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Structure of ionic liquids with cationic silicon-substitutions

机译:带有阳离子硅取代基的离子液体的结构

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Significantly lower viscosities result when a single alkyl carbon is replaced by a silicon atom on the side chain of an ionic liquid cation. To further explore this effect, we compare liquid structure factors measured using high-energy X-ray scattering and calculated using molecular dynamics simulations. Four ionic liquids are studied that each has a common anion, bis(trifluoromethylsulfonyl) amide (NTf2-). The four cations for this series of NTf2--anion ionic liquids are 1-methyl-3-trimethylsilylmethylimidazolium (Si-mim(+)), 1-methyl-3-neopentylimidazolium (C-mim(+)), 1-methyl-3-pentamethyldisiloxymethylimidazolium (SiOSi-mim(+)), and 1-methyl-1-trimethylsilylmethylpyrrolidinium (Si-pyrr(+)). To achieve quantitative agreement between the structure factors measured using high-energy X-ray scattering and molecular dynamics simulations, new transferable parameters for silicon were calibrated and added to the existing force fields. Published by AIP Publishing.
机译:当单个烷基碳被离子液体阳离子侧链上的硅原子取代时,粘度会显着降低。为了进一步探讨这种影响,我们比较了使用高能X射线散射测量的液体结构因子和使用分子动力学模拟计算的液体结构因子。研究了四种离子液体,每种液体都有一个共同的阴离子双(三氟甲基磺酰基)酰胺(NTf2-)。该系列NTf2-阴离子离子液体的四个阳离子为1-甲基-3-三甲基甲硅烷基甲基咪唑鎓(Si-mim(+)),1-甲基-3-新戊酰咪唑鎓(C-mim(+)),1-甲基- 3-五甲基二甲硅烷氧基甲基咪唑鎓(SiOSi-mim(+))和1-甲基-1-三甲基甲硅烷基甲基吡咯烷鎓(Si-pyrr(+))。为了在使用高能X射线散射测量的结构因子与分子动力学模拟之间达到定量一致,对硅的新可转移参数进行了校准,并将其添加到现有的力场中。由AIP Publishing发布。

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