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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Exploring the phase diagram of the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesufonyl)imide

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Author(s):
Lima, Thamires A. [1] ; Faria, Luiz F. O. [1] ; Paschoal, Vitor H. [1] ; Ribeiro, Mauro C. C. [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Lab Espectroscopia Mol, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Molecular Structure; v. 1183, p. 149-156, MAY 5 2019.
Web of Science Citations: 1
Abstract

X-ray diffraction and Raman scattering measurements of the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesufonyl)imide, {[}Pyrr(1,4)]{[}NTf2], were performed in a wide range of temperature and pressure. Pressure dependence of glass transition T-g(p), cold-crystallization T-cc(p), and melting T-m(p) temperatures were obtained from atmospheric pressure up to ca. 2.0 GPa. The temperature dependence of Raman spectra within the T-cc < T < T-m range at atmospheric pressure unveils conformational dynamics of {[}Pyrr(1)(,4)](- )while {[}NTf2](-) remains in the transoid conformation characteristic of the crystal. The different pressure dependence of T-cc(p) and T-m(p) implies that these curves merge at ca. 330 K and 1.0 GPa. Upon the assumption that the T-g(p) curve belongs to isochronous states, T-g(p) is discussed in terms of thermodynamic scaling using low-temperature and high-pressure extrapolations of an empirical equation of state. The ratio between constant volume and constant pressure activation energies for viscous flow, E-v/E-p, increases only slightly in the pressure range investigated in this work. The results obtained under simultaneous variation of temperature and pressure highlight the complex interplay between glass transition and crystallization of {[}Pyrr(1)(,4)]{[}NTf2]. (C) 2019 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 16/21070-5 - Vibrational spectroscopy with spatial resolution
Grantee:Mauro Carlos Costa Ribeiro
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/05803-0 - Ionic liquid structure under high pressure
Grantee:Luiz Felipe de Oliveira Faria
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 15/07516-8 - Collective dynamics of ionic liquids
Grantee:Vitor Hugo Paschoal
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 14/15049-8 - A Raman spectroscopy study of the glass transition of ionic liquids under high pressure.
Grantee:Thamires Andrade Lima
Support type: Scholarships in Brazil - Post-Doctorate