Ethylammonium alkanoate-based ionic liquid + water mixtures: A calorimetric and volumetric study at 298.15 K

Marianna Usula, Natalia V. Plechkova, Alessandra Piras, Silvia Porcedda*

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A systematic study of a series of room-temperature ionic liquids, belonging to the ethylammonium alkanoate family (EAX), was carried out at 298.15 K and 0.1 MPa with the aim of investigating the effect of the anionic chain length on some thermophysical properties and their behaviour in water (W), over the whole mole fraction range. The determination of Gutmann acceptor numbers for the pure EAX by using 31P NMR spectroscopy allowed us to obtain a quantitative measure of Lewis acidity. Experimental densities, ρ, were used to calculate molar volumes, V m, and excess molar volumes, V E. Complementary information was obtained by isothermal titration calorimetry that provided the values of the heat of mixing, H E, and the excess partial molar enthalpies of each component, H1E and H ¯ 2 E. The density values of pure EAX samples decrease as the alkyl chain length of the anion increases. Moderate negative V E and H E values were found for each EAX + W system, indicating the presence of attracting interactions between the constituents.

Original languageEnglish
Pages (from-to)1129-1137
Number of pages9
JournalJournal of Thermal Analysis and Calorimetry
Volume121
Issue number3
Early online date04 Jun 2015
DOIs
Publication statusPublished - Sep 2015

Keywords

  • Butanoate
  • Enthalpy
  • Ethylammonium
  • Excess molar volume
  • Methanoate
  • Propanoate

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics

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