Phosphate-Triggered Self-Assembly ofN-[(Uracil-5-yl)methyl]urea: A Minimalistic Urea-Derived Hydrogelator
摘要:
AbstractN‐[(Uracil‐5‐yl)methyl]urea is reported as a minimalistic low‐molecular‐weight hydrogelator (LMWHG). The unusual phosphate‐induced assembly of this compound has been thoroughly investigated by IR, UV/Vis, and NMR spectroscopy, electron microscopy, and rheological experiments. This rare example of an anion‐triggered urea‐based LMWHG is the first example of a pyrimidine‐ and urea‐containing molecule that can be forced into self‐assembly in aqueous solution without additional aromatic or lipophilic groups. The gelator/phosphate ratio within the hydrogel was successfully determined by 31P MAS NMR spectroscopy. The hydrogel exhibits a very fast and repeatable self‐healing property, and remarkable G′ values. The viscoelastic properties of the hydrogel can easily be tuned by variation of the phosphate ratio.
Phosphate-Triggered Self-Assembly of<i>N</i>-[(Uracil-5-yl)methyl]urea: A Minimalistic Urea-Derived Hydrogelator
作者:Alexander J. Kleinsmann、Nicole M. Weckenmann、Boris J. Nachtsheim
DOI:10.1002/chem.201402916
日期:2014.7.28
AbstractN‐[(Uracil‐5‐yl)methyl]urea is reported as a minimalistic low‐molecular‐weight hydrogelator (LMWHG). The unusual phosphate‐induced assembly of this compound has been thoroughly investigated by IR, UV/Vis, and NMR spectroscopy, electron microscopy, and rheological experiments. This rare example of an anion‐triggered urea‐based LMWHG is the first example of a pyrimidine‐ and urea‐containing molecule that can be forced into self‐assembly in aqueous solution without additional aromatic or lipophilic groups. The gelator/phosphate ratio within the hydrogel was successfully determined by 31P MAS NMR spectroscopy. The hydrogel exhibits a very fast and repeatable self‐healing property, and remarkable G′ values. The viscoelastic properties of the hydrogel can easily be tuned by variation of the phosphate ratio.