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Pure Appl. Chem., 2009, Vol. 81, No. 5, pp. 781-790

Published online 2009-03-20

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)

Kenneth N. Marsh1*, Joan F. Brennecke2, Robert D. Chirico3, Michael Frenkel3, Andreas Heintz4, Joseph W. Magee3, Cor J. Peters5, Luis Paulo N. Rebelo6 and Kenneth R. Seddon7

1 Department of Chemical and Process Engineering, University of Canterbury, Private bag 4800, Christchurch, 8140, New Zealand
2 Department of Chemical and Biochemical Engineering, University of Notre Dame, Notre Dame, IN 46556-5637, USA
3 Thermophysical Properties Division, National Institute of Standards and Technology, Boulder, CO 80305-3328, USA
4 Department of Chemistry, University of Rostock, 18055 Rostock, FRG
5 Faculty of Mechanical, Maritime, and Materials Engineering, Department of Process and Energy, Delft University of Technology, Leeghwaterstraat 44, 2628 CA, Delft, The Netherlands, and The Petroleum Institute, Chemical Engineering Department, Abu Dhabi, United Arab Emirates
6 Instituto de Tecnologica Química Biológica, Universidade Nova de Lisboa, 2780-901 Oeiras, Portugal
7 QUILL, School of Chemistry and Chemical Engineering, The Queen's University of Belfast, Belfast, BT9 5AG, UK

Abstract: This article summarizes the results of IUPAC Project 2002-005-1-100 (Thermodynamics of ionic liquids, ionic liquid mixtures, and the development of standardized systems). The methods used by the various contributors to measure the thermophysical and phase equilibrium properties of the reference sample of the ionic liquid 1-hexyl-3-methylimidazolium bis [(trifluoromethyl)sulfonyl]amide and its mixtures are summarized along with the uncertainties estimated by the contributors. Some results not previously published are presented. Properties of the pure ionic liquid included thermal properties (triple-point temperature, glass-transition temperature, enthalpy of fusion, heat capacities of condensed states), volumetric properties, speeds of sound, viscosities, electrolytic conductivities, and relative permittivities. Properties for mixtures included gas solubilities, solute activity coefficients at infinite dilution, liquid-liquid equilibrium temperatures, and excess volumes. The companion article (Part 2) provides a critical evaluation of the data and recommended values with estimated combined expanded uncertainties.