Document type
Conference papers
Document subtype
Abstract
Title
Thermophysical Properties Data for 1-Hexyl-3-Methylimidazolium Bis(Trifluorosulfonyl)Imide [C6mim][(CF3SO2)N] – A Path To Standardization
Participants in the publication
Xavier Paredes (Author)
Carla S.G.P. Queirós (Author)
Fernando J. V. Santos (Author)
Ângela F. Santos (Author)
Maria Soledade C.S. Santos (Author)
Maria José V. Lourenço (Author)
Carlos A. Nieto de Castro (Author)
CQE
Summary
It is well known that the published data on the thermophysical properties of ionic liquids are normally in disagreement if we compare results from different laboratories, using different samples and different measurement protocols [1]. This fact was recognized several years before, at the level of IUPAC, which established IUPAC Project 2002-005-1-100 (Thermodynamics of ionic liquids, ionic liquid mixtures, and the development of standardized systems), with the main objective of recommending a reference ionic liquid, making reference-quality measurements on selected thermophysical properties of both the pure ionic liquid and its mixtures, and establish recommended values for the properties measured and provide recommendations on measurement methods [2,3]. The ionic liquid chosen was 1-hexyl-3-methylimidazolium bis(trifluorosulfonyl)imide [C6mim][(CF3SO2)N], because it is stable, has a low viscosity compared with that of most common ionic liquids, has a low water solubility, and is easily prepared and purified. In addition, due to its hydrophobicity, is capable of being obtained very pure, with water amounts as small as 20 ppm.\nIt is the purpose of this paper to report results obtained with the sample of [C6mim][(CF3SO2)N] synthesised in the IUPAC project, namely on density, speed of sound, viscosity, surface tension and refractive index, and to reanalyse the validity of the recommended values for this properties, resolving problems then encountered in the work performed in the period 2002-2008. \nThis approach will facilitate to define standard reference data in the future for hydrophobic ionic liquids. \n\nReferences\n[1] C.A. Nieto de Castro, “Thermophysical properties of ionic liquids: Do we know how to measure them accurately?”, J. Molecular Liquids (2010) 156, 10–17\n[2] K.N. Marsh, J.F. Brennecke, R.D. Chirico, M. Frenkel, A. Heintz, J.W. Magee, C.J. Peters, L.P.N. Rebelo, K.R. Seddon, Thermodynamic and thermophysical properties of the reference ionic liquid: 1-hexyl-3-methylimidazolium bis(trifluoromethyl)sulfonyl amide (including mixtures) Part 1. Experimental methods and results (IUPAC Technical Report). Pure and Appl. Chem. 81 (2009) 781-790 \n[3] R.D. Chirico, V. Diky, J.W. Magee, M. Frenkel, K.N. Marsh, Thermodynamic and thermophysical properties of the reference ionic liquid: 1-hexyl-3-methylimidazolium bis (trifluoromethyl)sulfonyl amide (including mixtures). Part 2. Critical evaluation and recommended property values (IUPAC Technical Report). Pure and Appl. Chem. 81 (2009) 791-828
Date of Publication
2019-11-4
Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Event
ILMAT V, 5th International Conference on Ionic Liquid-based Materials, Paris, 4-8 November, 2019
Publication Identifiers
Address
Paris, France
Organizers
MIreille Turmine
Publisher
Sorbonne Université
Number of pages
1
Starting page
90
Keywords
ionic liquids
data standardization
[C6mim][(CF3SO2)N]