Vibrational frequency shift of 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids under high pressure

Autor(es)

Penna, Tatiana C. ^[1] ; Ribeiro, Mauro C. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Lab Espectroscopia Mol, Av Prof Lineu Prestes, BR-74805508 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MOLECULAR LIQUIDS; v. 278, p. 213-218, MAR 15 2019.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 13/07741-6 - Espectroscopia Vibracional e Propriedades Termodinâmicas de Líquidos Iônicos em Alta Pressão
• Beneficiário: Tatiana Casselli Penna
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/21070-5 - Espectroscopia vibracional com resolução espacial
• Beneficiário: Mauro Carlos Costa Ribeiro
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 12/13119-3 - Espectroscopia vibracional em fases condensadas
• Beneficiário: Mauro Carlos Costa Ribeiro
• Linha de fomento: Auxílio à Pesquisa - Temático