Vibrational Spectroscopic Study on Ion Solvation and Ion Association of Lithium Tetrafluoroborate in 4-Ethoxymethyl-ethylene Carbonate
Autor: | Xiangpeng Fang, Zhiming Zhou, Xin Wang, Ji-Mei Li, Wen Yao, Helin Luan, Hongwei Qiao |
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Rok vydání: | 2008 |
Předmět: | |
Zdroj: | Chinese Journal of Chemistry. 26:689-692 |
ISSN: | 1614-7065 1001-604X |
Popis: | Solvation and association interactions in solutions of lithium tetrafluoroborate/4-ethoxymethyl-ethylene carbonate (EEC) have been studied as a function of concentration of lithium tetrafluoroborate by infrared and Raman spectroscopy. Strong interactions between Li(+) and solvent molecules or BF(4)(-) anions were observed. Splitting of the ring symmetric angle deformation band, the carbonyl stretching band and the skeletal ring vibrational band suggests that the interaction between Li(+) ions and EEC molecules take place via the oxygen atom on the carbonyl group. The apparent solvation numbers of Li(+), varying from 4.32 to 1.26 with increasing the solution concentrations, were deduced. Band-fitting to the B-F stretching band of BF(4)(-) anion permits detailed assess of ion pairing. The spectroscopically free BF(4)(-) anion, contact ion pair and contact ion dimmers coexist in concentrated solutions. |
Databáze: | OpenAIRE |
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