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 language | English (US) |
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Pages (from-to) | 1383-1385 |
Number of pages | 3 |
Journal | Journal of Organic Chemistry |
Volume | 69 |
Issue number | 4 |
DOIs | |
State | Published - Feb 20 2004 |
ASJC Scopus subject areas
- Organic Chemistry