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Low-temperature heat capacities and the thermodynamic functions of ionic liquids 1-heptyl-3-methyl imidazolium perrhenate

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Abstract

Low-temperature heat capacities of the 1-heptyl-3-methyl imidazolium perrhenate ionic liquids have been measured by a high-precision automated adiabatic calorimeter over the temperature range from 78 to 400 K. In this report, the standard molar heat capacity was determined to be 679.438 J K−1 mol−1. The melting temperature at 207.873 ± 0.374 K has been discovered by the heat-capacity curve. The experimental values of molar heat capacities were fitted to two polynomial equations of heat capacities (Cp,m) by least square method. Meanwhile, the thermodynamic functions (HT − H298.15), (ST − S298.15), and (GT − G298.15) were also calculated in the temperature range from 298.15 to 400 K with the interval of 5 K.

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Acknowledgements

This project was financially supported by National Natural Science Foundation of China (NSFC) (Nos. 21673107, 21471073, 21373005) and L National Key Technology R&D Program 2015BAB02B03.

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Authors and Affiliations

  1. Key Laboratory of Rare and Scattered Elements Liaoning Province, College of Chemistry, Liaoning University, Shenyang, 110036, People’s Republic of China

    Da-wei Fang, Jian-tao Zuo, Mei-chen Xia, Jing Tong & Jun Li

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  1. Da-wei Fang
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  2. Jian-tao Zuo
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  3. Mei-chen Xia
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  4. Jing Tong
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  5. Jun Li
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Correspondence to Jun Li.

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Fang, Dw., Zuo, Jt., Xia, Mc. et al. Low-temperature heat capacities and the thermodynamic functions of ionic liquids 1-heptyl-3-methyl imidazolium perrhenate. J Therm Anal Calorim 132, 2003–2008 (2018). https://doi.org/10.1007/s10973-018-7129-7

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  • DOI: https://doi.org/10.1007/s10973-018-7129-7

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