Electrochemistry in ionic liquids: Case study of a manganese corrole
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-EtOSO_3); 1-ethyl-3-methylimidazolium triflate (EMIm-OTf); and 1-ethyl-3-methylimidazolium tetracyanoborate (EMIm-TCB). We found that Mn^(IV/III) E_(1/2) values depend on IL counter anion: OTf–< EtOSO_3− < 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.
Additional Information
© 2017 Pleiades Publishing, Ltd. Received January 6, 2017; in final form, February 3, 2017. First Online: 21 October 2017. 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. The article is published in the original. The authors thank Shabnam Hematian for helpful discussions. This work was supported by the NSF CCI Solar Fuels Program (CHE-1305124) (H.B.G. and J. R. W.). Additional support was provided by King Fahd University of Petroleum and Minerals (R.H.G.). The authors declare no competing financial interestAdditional details
- Eprint ID
- 82541
- DOI
- 10.1134/S1023193517100068
- Resolver ID
- CaltechAUTHORS:20171020-140056026
- CHE-1305124
- NSF
- King Fahd University of Petroleum and Minerals (KFUPM)
- Created
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2017-10-20Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field
- Caltech groups
- CCI Solar Fuels