Cucurbit[7]uril: A very effective host for viologens and their cation radicals

Winston Ong, Marielle Gómez-Kaifer, Angel E. Kaifer

Research output: Contribution to journalArticlepeer-review

279 Scopus citations


The host cucurbit[7]uril (CB7) forms very stable inclusion complexes with simple 4,4′-bipyridinium (viologen) dication guests in aqueous solution. The binding constants were measured by electronic absorption spectroscopy and found to be as high as 1 × 105 L/mol. One-electron reduction of the viologen guest results in a modest 2-fold decrease of the binding constant. The rate of the heterogeneous electron-transfer reaction between the complexed viologen dication and cation radical remained fast in the voltammetric time scale.

Original languageEnglish (US)
Pages (from-to)1791-1794
Number of pages4
JournalOrganic letters
Issue number10
StatePublished - May 16 2002

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry


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