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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Solvation Structure of Imidazolium Cation in Mixtures of [C(4)mim][TFSA] Ionic Liquid and Diglyme by NMR Measurements and MD Simulations
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Solvation Structure of Imidazolium Cation in Mixtures of [C(4)mim][TFSA] Ionic Liquid and Diglyme by NMR Measurements and MD Simulations

机译:NMR测量和MD模拟[C(4)MIM] [TFSA]离子液体和DIGLYME混合物中咪唑鎓阳离子的溶剂化结构

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摘要

Interactions of 1-butyl-3-methylimidazolium cation ([C(4)mim]}) with bis(trifluoromethanesulfonyl)amide anion ([TFSA](-)). and diethyleneglycol dimethyl ether (diglyme) in mixtures of [C(4)mim] [TFSA] ionic liquid and diglyme have been investigated using H-1 and C-13 NMR spectroscopy and molecular dynamics (MD) simulations. The results of NMR chemical shift measurements and MD simulations showed that the diglyme oxygen atoms have contact with the imidazolium hydrogen atoms, of [C(4)mim](+) in the mixtures. The contact between the hydrogen atoms of imidazolium and the oxygen atoms of [TPSA](-) remains even when the diglyme mole fraction (x(diglyme)) increases up to 0.9. However, the coordination numbers of the hydrogen atoms of [C(4)mim](+) with oxygen atoms of diglyme increase with Xdieyme. The [TFSA](-) anions around [C(4)mim](+) are not completely replaced-by diglyme even at X-diglyme > 0.9. The MD simulations revealed:that the diglymes also have contact with the butyl group of [C(4)mim](+). The methyl groups of diglyme prefer to have contact with the terminal methyl group of the butyl group, whereas the, diglyme oxygen atoms prefer to have contact with the methylene group connected to the imidazolium ring of [C(4)mim](+).
机译:用双(三氟甲磺酰基)酰胺阴离子([TFSA]( - ))的1-丁基-3-甲基咪唑鎓阳离子([C(4)MIM])的相互作用。使用H-1和C-13 NMR光谱和分子动力学(MD)模拟研究了[C(4)MIM] [TFSA]离子液体和DIGLYME的混合物中的二乙二醇二甲醚(DIGLYME)。 NMR化学换档测量和MD模拟的结果表明,DIGLYME氧原子与混合物中的[C(4)MIM](+)的咪唑鎓氢原子接触。即使数字摩尔级分(x(diglyme))增加到0.9,咪唑鎓氢原子与[TPSA]( - )的氧原子之间的接触保持仍然保持在0.9。然而,[C(4)MIM](+)的氢原子与Xdieme的氧原子的配位数量增加。即使在X-DIGLYME> 0.9,围绕[C(4)MIM](+)周围的[TFSA]( - )阴离子并不完全取代DIGLYME。显示MD模拟:DIGLYMES还与[C(4)MIM](+)的丁基接触。 DiglyMe的甲基优选与丁基的末端甲基接触,而Diglyme氧原子优选与连接到[C(4)MIM](+)的咪唑鎓环的亚甲基接触。

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