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

Winston Ong; Angel Kaifer

doi:10.1021/jo035030+

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

Winston Ong, Angel Kaifer

Chemistry

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181 Scopus citations

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
Pages (from-to)	1383-1385
Number of pages	3
Journal	Journal of Organic Chemistry
Volume	69
Issue number	4
DOIs	https://doi.org/10.1021/jo035030+
State	Published - Feb 20 2004

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ASJC Scopus subject areas

Organic Chemistry

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Ong, W., & Kaifer, A. (2004). Salt Effects on the Apparent Stability of the Cucurbit[7]uril-Methyl Viologen Inclusion Complex. Journal of Organic Chemistry, 69(4), 1383-1385. https://doi.org/10.1021/jo035030+

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AB - 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.

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10.1021/jo035030+