Cyclic voltammetry of metallic acetylacetonate salts in quaternary ammonium and phosphonium based deep eutectic solvents

Mohammed Harun Chakrabarti*, Nigel P. Brandon, Farouq S. Mjalli, Laleh Bahadori, Inas M. Al Nashef, Mohd Ali Hashim, M. A. Hussain, Chee Tong John Low, Vladimir Yufit

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Seven commercially sourced acetylacetonate salts were investigated in deep eutectic solvents (DESs that were prepared from ethylene glycol and trifluoroacetamide hydrogen bond donors) by cyclic voltammetry, to identify electrolytes suitable for future applications in electrochemical energy storage devices. Although the solubilities are low and on the order of 0.02 mol·L-1 for the most soluble salts, some were found to display encouraging quasi-reversible electrochemical kinetics. For instance, the diffusion coefficients of copper(II) acetylacetonate and iron(III) acetylacetonate in the trifluoroacetamide based DES are 1.14 × 10 -8 and 5.12 × 10-9 cm2·s -1, which yields rate constants of 3.16 × 10-3 and 8.43 × 10-6 cm·s-1, respectively. These results are better than those obtained with the DESs prepared from ethylene glycol. The poor kinetics of the iron(III) acetylacetonate system was possibly due to the hygroscopic nature of the DESs that resulted in a continuous build-up of moisture in the system in spite of the maintenance of an inert atmosphere by means of a plastic glove bag. Further work is thus envisaged in an inert dry box that could lead to H-type glass cell charge/discharge experiments in the future.

Original languageEnglish
Pages (from-to)2329-2341
Number of pages13
JournalJournal of Solution Chemistry
Issue number12
Publication statusPublished - Dec 2013


  • Acetylacetonate
  • Deep eutectic solvents
  • Electrochemical energy storage
  • Solubility

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Physical and Theoretical Chemistry


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