Vibrational Spectroscopic Study on Ion Solvation and Ion Association of Lithium Tetrafluor

Vibrational Spectroscopic Study on Ion Solvation and Ion Association of Lithium Tetrafluoroborate in

4-Ethoxymethyl-ethylene Carbonate

QIAO Hong-Wei;LUAN He-Lin;ZHOU Zhi-Ming;FANG Xiang-Peng;YAO Wen;WANG Xin;LI Ji-Mei

【期刊名称】《中国化学（英文版）》 【年(卷),期】2008(026)004

【摘要】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 BF4- 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 BF4- anion permits detailed assess of ion pairing. The spectroscopically free BF4- anion, contact ion pair and contact ion dimmers coexist in concentrated solutions. 【总页数】4页(689-692)

【关键词】vibrational spectroscopy;ion solvation and association;lithium