Gelation by supramolecular dimerization of mono(urea)s†
Abstract
Mono-ureido salicylic acid derivatives form hydrogen bonded dimers that mimic the gelation behaviour of covalently linked bis(urea)s. The 5-ureido salicylic acid isomers are much more effective gelators because of the lowered conjugation and less planar geometry, resulting in stronger urea⋯urea α-tape hydrogen bonding interactions.
- This article is part of the themed collection: Host–guest chemistry