Published data on the thermophysical properties of ionic liquids are normally in disagreement if results from different laboratories, using different samples and different measurement protocols, are compared. This fact was recognized years ago at the level of the International Union of Pure and Applied Chemistry (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, establishing recommended values for the properties measured, and providing recommendations on measurement methods. The ionic liquid chosen was 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C₆mim][(CF₃SO₂)₂N], because of its stability, low viscosity compared with that of most common ionic liquids, low water solubility, ease of preparation and purification, and commercial availability. Due to its hydrophobicity, it is capable of being obtained very pure, with water amounts as small as 20 ppm. This paper reports new results obtained with the sample of [C₆mim][(CF₃SO₂)₂N] synthesized in the IUPAC project, namely on density, speed of sound, surface tension, and refractive index, as well as thermal conductivity of a commercial sample at P = 0.1 MPa, as a function of temperature, and proposes reference data and reference data correlations for the density, speed of sound, heat capacity, surface tension, viscosity, electrical conductivity, thermal conductivity, refractive index, ion self-diffusion coefficient, and melting temperature of this ionic liquid at 0.1 MPa, as a function of temperature, using these and other data reported up to July 2020. Rheological measurements demonstrated that this ionic liquid is Newtonian.

中文翻译：

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1-己基-3-甲基咪唑双（三氟甲基磺酰基）酰亚胺[C6mim] [（CF3SO2）2N]的热物理性质—新数据，参考数据和参考相关

如果将来自不同实验室，使用不同样品和不同测量规程的结果进行比较，则有关离子液体热物理性质的公开数据通常会存在分歧。多年前，国际纯粹与应用化学联合会（IUPAC）意识到了这一事实，该联合会建立了IUPAC项目2002-005-1-100（离子液体，离子液体混合物的热力学以及标准化系统的开发） ，主要目的是推荐参比离子液体，对纯离子液体及其混合物的选定热物理性质进行参考质量测量，为测量的性质建立推荐值，并提供测量方法的建议。₆ mim] [（CF ₃ SO ₂）₂ N]，因为其稳定性，与大多数常见离子液体相比粘度低，水溶性低，易于制备和纯化以及可商购获得。由于其疏水性，因此能够获得非常纯净的水（水分含量低至20 ppm）。本文报告了在IUPAC项目中合成的[C ₆ mim] [（CF ₃ SO ₂）₂ N]样品获得的新结果，即密度，声速，表面张力和折射率以及热性能。市售样品在P处的电导率 = 0.1 MPa，作为温度的函数，并针对密度，声速，热容量，表面张力，粘度，电导率，导热率，折射率，离子自扩散系数和使用截止到2020年7月的这些数据和其他数据，该离子液体的最高熔化温度为0.1 MPa，随温度的变化。流变学测量表明该离子液体为牛顿型。