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Electrochemistry in ionic liquids: Case study of a manganese corrole

  • Section 3. Electron Transfer Kinetics and Electrochemical Processes
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Abstract

Voltammetry of [5,10,15-tris(pentafluorophenylcorrole)]Mn(III) was investigated in four different ionic liquids (ILs): 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIm-TFSI); 1-ethyl-3-methylimidazolium ethylsulfate (EMIm-EtOSO3); 1-ethyl-3-methylimidazolium triflate (EMIm-OTf); and 1-ethyl-3-methylimidazolium tetracyanoborate (EMIm-TCB). We found that MnIV/III E 1/2 values depend on IL counter anion: OTf–< EtOSO3 − < TFSI− < TCB−. In EMIm-TCB and BMIm- TFSI, reversible, diffusion-controlled MnIV/III reactions occurred, as evidenced in each case by the ratio of anodic to cathodic diffusion coefficients over a range of scan rates. Axial coordination was evidenced by a cathodic to anodic diffusion coefficient ratio greater than one, an increasing cathodic to anodic peak current ratio with increasing scan rate, and a split Soret band in the UV-vis spectrum of the complex.

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Authors and Affiliations

  1. Beckman Institute, and Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Mail Code 139-74, Pasadena, California, 91125, USA

    Brendon J. McNicholas, Carl Blumenfeld, Wesley W. Kramer, Robert H. Grubbs, Jay R. Winkler & Harry B. Gray

Authors
  1. Brendon J. McNicholas
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  2. Carl Blumenfeld
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  3. Wesley W. Kramer
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  4. Robert H. Grubbs
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  5. Jay R. Winkler
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  6. Harry B. Gray
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Corresponding author

Correspondence to Jay R. Winkler.

Additional information

Published in Russian in Elektrokhimiya, 2017, Vol. 53, No. 10, pp. 1342–1347.

This paper is the authors’ contribution to the special issue of Russian Journal of Electrochemistry dedicated to the 100th anniversary of the birth of the outstanding Soviet electrochemist Veniamin G. Levich.

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McNicholas, B.J., Blumenfeld, C., Kramer, W.W. et al. Electrochemistry in ionic liquids: Case study of a manganese corrole. Russ J Electrochem 53, 1189–1193 (2017). https://doi.org/10.1134/S1023193517100068

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  • DOI: https://doi.org/10.1134/S1023193517100068

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