Solvent-controlled formation of alkali and alkali-earth-secured cucurbituril/guest trimers

Abstract

Cucurbit[7]uril (CB[7]) encapsulates adamantyl and trimethylsilyl substituents of positively charged guests in dimethyl sulfoxide (DMSO). Unlike in water or deuterium oxide, addition of a selection of alkali and alkali-earth cations...

Dual catalytic activity of a cucurbit[7]uril-functionalized metal alloy nanocomposite for sustained hydrogen generation: hydrolysis of ammonia borane and electrocatalysts for the hydrogen evolution reaction

“…Cucurbiturils (CBs) are one of the prominent macrocyclic receptors having a hydrophobic cavity and two symmetric hydrophilic carbonyl portals (Scheme 1). 12,24–28 Cucurbit[7]uril (CB7), one of the homologues of the CB family, comprises seven glycoluril units and shows strong interaction towards cations/metal ions through ion–dipole interactions, moderate interaction towards organic guest molecules through hydrophobic interactions and the positively charged carbon centers on the equatorial region of CB show interactions towards polyanions. 12,24–33 By capitalizing on such subtle non-covalent interactions, in an earlier study, we achieved the separation of clinical grade radioactive technetium ( 99m Tc) for theranostic purposes.…”

“…12,24–28 Cucurbit[7]uril (CB7), one of the homologues of the CB family, comprises seven glycoluril units and shows strong interaction towards cations/metal ions through ion–dipole interactions, moderate interaction towards organic guest molecules through hydrophobic interactions and the positively charged carbon centers on the equatorial region of CB show interactions towards polyanions. 12,24–33 By capitalizing on such subtle non-covalent interactions, in an earlier study, we achieved the separation of clinical grade radioactive technetium ( 99m Tc) for theranostic purposes. 29 In a recent study on the metal-free catalytic hydrolysis of AB using CB hosts as catalysts at room temperature, we have established an enhanced hydrolysis reaction rate, lowering the activation energy and significant decrease in ammonia release.…”