Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 124, Issue -, Pages 40-45Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2014.01.001
Keywords
Li+-molecule interaction; Lithium tetrafluoroborate; Propylene carbonate (PC); N,N-dimethylformamide (DMF); FTIR spectroscopy; Preferential solvation
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Funding
- National 863 Program [2013AA110100]
- Chinese Academy of Sciences
- key laboratory of salt lakes resources and chemistry (Chinese Academy of Sciences)
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FTIR (Fourier transformed infrared) spectra have been collected and analyzed for solutions of lithium tetrafluoroborate in propylene carbonate (PC), N,N-dimethylformamide (DMF), and PC + DMF mixtures. The band splitting and symmetric ring deformation for PC and O=C-N deformation for DMF suggest that there is a strong interaction between lithium cations and solvent molecules. The solvent molecules have been assigned to two types, the free and complexed molecules. By a comparison of the intensity for the corresponding bands, it has been concluded that Li+ cations are preferentially solvated by DMF molecules in the LiBF4/PC + DMF solutions. This has been explained by the difference in values of donor number (DN). (C) 2014 Elsevier B.V. All rights reserved.
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