| Full text | |
| Author(s): |
Total Authors: 2
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| Affiliation: | [1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Lab Espectroscopia Mol, Av Prof Lineu Prestes, BR-74805508 Sao Paulo - Brazil
Total Affiliations: 1
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| Document type: | Journal article |
| Source: | JOURNAL OF MOLECULAR LIQUIDS; v. 278, p. 213-218, MAR 15 2019. |
| Web of Science Citations: | 1 |
| Abstract | |
The Raman band belonging to the totally symmetric stretching mode of the {[}BE4](-) anion, v(s)(BF4), in 1-alkyl-3-methylimidazolium ionic liquids, {[}C(n)C(1)im]{[}BF4], n = 4, 6, and 8, has been measured under high pressure using a diamond anvil cell. The pressure dependence of v(s)(BF4) frequency up to 2.0 GPa is converted to a function of density using high pressure extrapolations of equations of states as discussed in previous works. The density induced shift of the v(s)(BF4) frequency was calculated by a perturbed hard-sphere model by considering the probe oscillator as a pseudo-diatomic molecule. In contrast to previous findings for the stretching mode of {[}PF6](-) in {[}C(n)C(1)im]{[}PF6] ionic liquids, for which the calculation considered only the repulsive short-range forces, in the case of {[}C(n)C(1)im]{[}BF4] the calculation indicates the role played by the attractive forces on the v(s)(BF4) frequency shift. (C) 2019 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 12/13119-3 - Vibrational spectroscopy in condensed phases |
| Grantee: | Mauro Carlos Costa Ribeiro |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/07741-6 - Vibrational Spectroscopy and Thermodynamic Properties of Ionic Liquids under High Pressure |
| Grantee: | Tatiana Casselli Penna |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 16/21070-5 - Vibrational spectroscopy with spatial resolution |
| Grantee: | Mauro Carlos Costa Ribeiro |
| Support Opportunities: | Research Projects - Thematic Grants |