Insights into the synthesis and properties of deep eutectic solvents based on cholinium chloride and carboxylic acids

C. Florindo, F. S. Oliveira, L. P N Rebelo, Ana M. Fernandes, I. M. Marrucho

Research output: Contribution to journalArticle

245 Citations (Scopus)

Abstract

Recently, many studies concerning the environmental impact of ionic liquids (ILs) have shown that despite their unique properties and clear advantages in an ever wide range of applications and processes, ILs are not intrinsically green. In a search for biodegradable and low toxicity, a new type of ILs has been developed, the deep eutectic solvents (DESs). In this context, the aim of this work is to provide accurate densities, viscosities, and refractive indices for DESs prepared using cholinium chloride as the hydrogen bond acceptor and several carboxylic acids (levulinic, glutaric, malonic, oxalic, and glycolic) as the hydrogen bond donors. The impact of two different synthetic methodologies, heating and grinding, in the thermophysical properties of the prepared DESs was assessed. The obtained DESs were analyzed using NMR spectroscopy, FTIR, and electrospray ionization mass spectrometry in order to check their structures and purities. Thermophysical properties, densities, viscosities, and refractive indices were rationalized in terms of the chemical structure of the prepared DESs. The effect of the presence of water in the thermophysical properties of the compounds was also evaluated. Finally, comparisons between the DESs and the corresponding ILs are presented.

Original languageEnglish
Pages (from-to)2416-2425
Number of pages10
JournalACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume2
Issue number10
DOIs
Publication statusPublished - 6 Oct 2014

Keywords

  • Carboxylic acids
  • Cholinium chloride
  • Deep eutectic solvents
  • Thermophysical properties

Fingerprint Dive into the research topics of 'Insights into the synthesis and properties of deep eutectic solvents based on cholinium chloride and carboxylic acids'. Together they form a unique fingerprint.

Cite this