Salt effects on the apparent stability of the cucurbit[7]uril-methyl viologen inclusion complex |
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Authors: | Ong Winston Kaifer Angel E |
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Affiliation: | Center for Supramolecular Science and Department of Chemistry, University of Miami, Coral Gables, Florida 33124-0431, USA. |
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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 (MV(2+)) 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 Ca(2+) ions than for solutions containing monovalent Na(+) ions. The competing ion-dipole interactions between Ca(2+) or Na(+) and MV(2+) ions appear to be responsible for the remarkable modulation of the K values observed in this work. |
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