Electrochemistry in ionic liquids: Case study of a manganese corrole

Autor: Robert H. Grubbs, Carl M. Blumenfeld, Brendon J. McNicholas, Harry B. Gray, Jay R. Winkler, Wesley W. Kramer
Rok vydání: 2017
Předmět:
Zdroj: Russian Journal of Electrochemistry. 53:1189-1193
ISSN: 1608-3342
1023-1935
DOI: 10.1134/s1023193517100068
Popis: 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.
Databáze: OpenAIRE
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