Li(+)-molecule interactions of lithium tetrafluoroborate in propylene carbonate + N,N-dimethylformamide mixtures: an FTIR spectroscopic study

Binbin Zhang; Yuan Zhou; Xiang Li; Jingying Wang; Gang Li; Qiang Yun; Xiufang Wang

doi:10.1016/j.saa.2014.01.001

Li(+)-molecule interactions of lithium tetrafluoroborate in propylene carbonate + N,N-dimethylformamide mixtures: an FTIR spectroscopic study

Spectrochim Acta A Mol Biomol Spectrosc. 2014 Apr 24:124:40-5. doi: 10.1016/j.saa.2014.01.001. Epub 2014 Jan 10.

Authors

Binbin Zhang¹, Yuan Zhou², Xiang Li³, Jingying Wang⁴, Gang Li¹, Qiang Yun¹, Xiufang Wang⁵

Affiliations

¹ Key Laboratory of Salt Lake Resources and Chemistry of Chinese Academy of Sciences, Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
² Key Laboratory of Salt Lake Resources and Chemistry of Chinese Academy of Sciences, Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China. Electronic address: zhouy@isl.ac.cn.
³ Key Laboratory of Salt Lake Resources and Chemistry of Chinese Academy of Sciences, Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China. Electronic address: lixiang@isl.ac.cn.
⁴ School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
⁵ Key Laboratory of Salt Lake Resources and Chemistry of Chinese Academy of Sciences, Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China.

PMID: 24463238
DOI: 10.1016/j.saa.2014.01.001

Abstract

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).

Keywords: FTIR spectroscopy; Li(+)-molecule interaction; Lithium tetrafluoroborate; N,N-dimethylformamide (DMF); Preferential solvation; Propylene carbonate (PC).

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Borates / chemistry*
Dimethylformamide / chemistry*
Lithium / chemistry*
Propane / analogs & derivatives*
Propane / chemistry
Solutions
Solvents / chemistry
Spectroscopy, Fourier Transform Infrared

Substances

Borates
Solutions
Solvents
lithium tetrafluoroborate
Dimethylformamide
propylene carbonate
Lithium
Propane