3 research outputs found
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Cucurbit[7]uril: A Very Effective Host for Viologens and Their Cation Radicals
The host cucurbit[7]uril (CB7) forms very stable inclusion complexes with simple 4,4‘-bipyridinium (viologen) dication guests in aqueous solution. The binding constants were measured by electronic absorption spectroscopy and found to be as high as 1 × 105 L/mol. One-electron reduction of the viologen guest results in a modest 2-fold decrease of the binding constant. The rate of the heterogeneous electron-transfer reaction between the complexed viologen dication and cation radical remained fast in the voltammetric time scale
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Importance of intramolecular hydrogen bonding for preorganization and binding of molecular guests by water-soluble calix[6]arene hosts
The binding affinity of calix[6]arene hexasulfonate hosts for ferrocene or cobaltocenium guests is highly dependent on the extent of intramolecular hydrogen bonding in the lower rim of the calixarene