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• W1988059439 abstract "Abstract 7 Li-NMR spectroscopy was used to study the complexation of Li + ion with 12C4, 15C5, C222, C221, C211 in acetonitrile (AN) and its 50% (wt/wt) mixtures with two new room temperature ionic liquids, 1-ethyl-3-methylimidazolium hexafluorophosphate (EMim PF 6 ) and 1-ethyl-3-methylimidazolium tetrafluoroborate (EMim BF 4 ) at 298 K. Excluding the cases of Li + –C211 in all solvents and Li + –C221 in AN and 50% (wt/wt) AN–EMim PF 6 , in other cases, the exchange between free and 1:1 complexed Li + was fast on the NMR time scale and only a single population average 7 Li signal was observed. Formation constants of the resulting 1:1 complexes were evaluated by computer fitting of the chemical shift-mole ratio data and integration of two 7 Li signals. All complexes in EMim PF 6 were found to be more stable than those in EMim BF 4 . 7 Li-NMR line-shape analysis was used to determine the kinetic parameters and the mechanism for the chemical exchange of Li + between the free and 1:1 complex with C221 in 50% (wt/wt) AN–EMim PF 6 mixtures solution. By comparing our study with the previous one, it is derived that, increasing the percentage of ion liquid in acetonitrile, changes the mechanism and decrease the exchange rate constant of Li + ion between free and complex sites." @default.
• W1988059439 created "2016-06-24" @default.
• W1988059439 creator A5025255835 @default.
• W1988059439 creator A5061578858 @default.
• W1988059439 date "2012-01-01" @default.
• W1988059439 modified "2023-10-18" @default.
• W1988059439 title "7Li-NMR study of the stoichiometry, stability and exchange kinetics of Li+ ion with 12-Crown-4, 15-Crown-5 and cryptands C222, C221 and C211 in 50% ionic liquid–acetonitrile mixtures" @default.
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• W1988059439 doi "https://doi.org/10.1016/j.poly.2011.09.028" @default.
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