Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 131, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3273206
Keywords
high-pressure effects; infrared spectra; liquid mixtures; liquid structure; organic compounds; solvation
Funding
- National Dong Hwa University
- National Science Council of Taiwan [NSC 98-2113-M-259-005-MY3]
- Ministry of Education, Culture, Sports, Science and Technology, Japan [18850017, 19003963, 19350033, 20350037]
- Grants-in-Aid for Scientific Research [20350037, 19350033, 18850017] Funding Source: KAKEN
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The microscopic features of binary mixtures formed by an ionic liquid (EMI(+)TFSA(-) or EMI(+)FSA(-)) and a molecular liquid (acetonitrile or methanol) have been investigated by high-pressure infrared spectroscopy. On the basis of its responses to changes in pressure and concentration, the imidazolium C-H appears to exist at least in two different forms, i.e., isolated and associated structures. The weak band at approximately 3102 cm(-1) should be assigned to the isolated structure. CD3CN can be added to change the structural organization of ionic liquids. The compression of an EMI(+)TFSA(-)/CD3CN mixture leads to the increase in the isolated C-H band intensity. Nevertheless, the loss in intensity of the isolated structures was observed for EMI(+)FSA(-)/CD3CN mixtures as the pressure was elevated. In other words, the associated configuration is favored with increasing pressure by debiting the isolated form for EMI(+)FSA(-)/CD3CN mixtures. The stronger C-H center dot F interactions in EMI(+)FSA(-) may be one of the reasons for the remarkable differences in the pressure-dependent results of EMI(+)TFSA(-) and EMI(+)FSA(-).
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