Kinetics of Formation of the Host–Guest Complex of a Viologen with Cucurbit[7]uril
Abstract
Host–guest complexation between the dicationic viologen 1-tri(ethylene glycol)-1′-methyl-<i>m</i>-xylyl-4,4′-bipyridinium and cucurbit[7]uril (<b>CB7</b>) was studied at pH = 4.5 in water. The stability constants of the mono- and bis-<b>CB7</b> adducts were determined at 25 °C by UV–vis spectroscopy. Stopped-flow kinetic experiments were performed to measure the formation and dissociation rate constants of the monoadduct: <i>k</i><sub>1</sub> = (6.01 ± 0.03) × 10<sup>6</sup> M<sup>–1 </sup>s<sup>–1</sup> and <i>k</i><sub>–1</sub> = 52.7 ± 0.4 s<sup>–1</sup>, respectively. Possible mechanisms of complexation are discussed in view of the kinetic results- Text
- Journal contribution
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- Biochemistry
- Molecular Biology
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- Plant Biology
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- adduct
- experiment
- dissociation rate constants
- 0.4
- k 1
- Complex
- pH
- monoadduct
- Possible mechanisms
- 4.5
- 52.7
- Host
- Formation
- cucurbit
- Viologen
- glycol
- CB
- complexation
- formation
- viologen
- Kinetic
- tri
- dicationic
- UV
- Cucurbit
- spectroscopy
- stability constants
Similar works
This paper was published in FigShare.
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