Influence of the pressure, temperature, cation and anion on the volumetric properties of ionic liquids: New experimental values for two salts.

Teresa Regueira Muñiz, Luis Lugo, Josefa Fernández

Research output: Contribution to journalJournal articleResearchpeer-review


Abstract: Experimental densities of two ionic liquids (ILs), 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([C4C1Pyrr][NTf2]) and 1-(2-methoxyethyl)-1-methyl-pyrrolidinium tris(pentafluoroethyl)trifluorophosphate ([C1OC2C1Pyrr][(C2F5)3PF3]), were measured over a broad temperature and pressure range, i.e. from (278.15 to 398.15)K and up to 120MPa, respectively. The isobaric thermal expansion coefficient of the two ILs was determined from these measurements finding a non-monotonous behaviour over the entire pressure range. The density values obtained were used to analyse the prediction ability of the methods proposed by Gardas and Coutinho and by Jacquemin et al. Furthermore, the influence of the cation and anion structure on the densities and the isothermal compressibilities was analyzed, also considering literature values.
Original languageEnglish
JournalJournal of Chemical Thermodynamics
Pages (from-to)440-448
Publication statusPublished - 2013
Externally publishedYes


  • IONIC liquids

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