Ternary Complex Formation by Cucurbit[7]uril Leads to Large Shifts in the Reduction Potentials of Suitable Viologens

Yeting Zheng, Angel E. Kaifer

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

This work addresses the effects of supramolecular complexation by cucurbit[7]uril (CB[7]) on the cell potential of aqueous batteries based on ferrocene and 4,4′-bipyridinum (viologen) electroactive materials. It was previously known that the oxidation potential of cationic ferrocene derivatives is shifted to more positive values by the formation of highly stable 1 : 1 binary complexes with CB[7]. Here, we found that the formation of 1 : 2 ternary complexes between suitably designed viologens and CB[7] leads to a pronounced shift to more negative values in the first one-electron reduction potential of the viologen. Combining these two effects, we predict that the corresponding aqueous redox flow battery (RFB) -containing cationic ferrocene in the catholyte and viologen in the anolyte- will exhibit a potential of 1.04 V in the absence of CB[7] and 1.30 V in the presence of suitable concentrations of CB[7]. This substantial potential increase might be improved in future research, as the supramolecular complexation effect seems to be rather general.

Original languageEnglish (US)
Pages (from-to)5610-5616
Number of pages7
JournalChemElectroChem
Volume6
Issue number22
DOIs
StatePublished - Nov 18 2019

Keywords

  • complexation
  • cucurbit[7]uril
  • ferrocene
  • redox flow batteries
  • viologen

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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