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Electrochemical properties of a verdazyl radical in room temperature ionic liquids

Lee, J, Caporale, C, McKinley, AJ, Fuller, RO ORCID: 0000-0003-3926-8680 and Silvester, DS 2020 , 'Electrochemical properties of a verdazyl radical in room temperature ionic liquids' , Australian Journal of Chemistry, vol. 73, no. 10 , pp. 1001-1009 , doi: 10.1071/CH19575.

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Abstract

Room temperature ionic liquids (RTILs) have been widely investigated as alternative electrochemical solvents for a range of dissolved species over the past two decades. However, the behaviour of neutral radicals dissolved in RTILs is relatively unexplored. In this work, the electrochemistry of a stable verdazyl radical – 1,5-dimethyl-3-phenyl-6-oxoverdazyl (MPV) – has been studied on a platinum thin-film electrode using cyclic voltammetry and chronoamperometry in 10 different RTILs. The organic solvent propylene carbonate is also employed as a comparison. The nature of the solvent system was found to have a large effect on the electrochemical behaviour, particularly on the reduction reaction of the verdazyl radical. Chronoamperometry on a microdisk electrode was used to calculate diffusion coefficients (D), and plots of D versus the inverse of viscosity were linear, suggesting typical hydrodynamic diffusional characteristics of the radical, in line with the behaviour of dissolved neutral and charged compounds (e.g. ferrocene and cobaltocenium) in RTILs. Overall, this study demonstrates that different RTILs have a significant influence on the electrochemistry of MPV, and therefore careful selection of the solvent system for electrochemical applications is advised.

Item Type: Article
Authors/Creators:Lee, J and Caporale, C and McKinley, AJ and Fuller, RO and Silvester, DS
Keywords: verdazyl, radical, ionic liquid, electrochemistry, electron spin resonance
Journal or Publication Title: Australian Journal of Chemistry
Publisher: CSIRO Publishing
ISSN: 0004-9425
DOI / ID Number: 10.1071/CH19575
Copyright Information:

Copyright 2020 CSIRO

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