SCHEDULED MAINTENANCE
Recognition of silver cations by a cucurbit[8]uril-induced supramolecular crown ether†
Abstract
The host–guest interaction of cucurbit[8]uril (Q[8]) with a synthesized guest molecule, consisting of naphthalene and viologen moieties bridged by a carbon oxygen chain, was investigated by 1H NMR and UV-Vis spectroscopy. The results indicated the formation of an inclusion complex in a ratio of 1 : 1 with a moderate association constant of Ka = (1.1 ± 0.2) × 106 L mol−1. The formation of this special complex is driven by the markedly enhanced charge-transfer interaction between the electron-rich and electron-deficient guest molecule inside the hydrophobic cavity of Q[8], while the carbon oxygen chain stays outside of Q[8] to form a supramolecular crown ether. Screening of the metal cation substrate suggested that the inclusion complex recognizes Ag+ ions with high selectivity, as shown by UV-Vis spectroscopy.
![Graphical abstract: Recognition of silver cations by a cucurbit[8]uril-induced supramolecular crown ether](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C5OB02590G&imageInfo.ImageIdentifier.Year=2016)
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