Salt Effects on the Apparent Stability of the Cucurbit[7]uril-Methyl Viologen Inclusion Complex

Winston Ong, Angel Kaifer

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Abstract

The effects of the medium ionic composition on the apparent equilibrium association constant (K) for the formation of a 1:1 inclusion complex between the guest methyl viologen (MV2+) and the host cucurbit[7]uril (CB7) were studied in aqueous solutions. The K values were found to decrease with increasing ionic strength, with more pronounced effects for solutions containing divalent Ca2+ ions than for solutions containing monovalent Na+ ions. The competing ion-dipole interactions between Ca2+ or Na+ and MV2+ ions appear to be responsible for the remarkable modulation of the K values observed in this work.

Original languageEnglish
Pages (from-to)1383-1385
Number of pages3
JournalJournal of Organic Chemistry
Volume69
Issue number4
DOIs
StatePublished - Feb 20 2004

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ASJC Scopus subject areas

  • Organic Chemistry

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