Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 33, Pages 8014-8024Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201700793
Keywords
additive molecules; NMR spectroscopy; self-assembly; STD NMR; supramolecular chemistry
Categories
Funding
- University of East Anglia
- Heriot-Watt University
- Royal Society of Edinburgh/Scottish Government Personal Research Fellowship Scheme
- EPSRC Directed Assembly Network [EP/K014382/1]
- EPRSC [EP/N033337/1]
- Engineering and Physical Sciences Research Council [EP/N033337/1] Funding Source: researchfish
- EPSRC [EP/N033337/1, EP/K014382/1] Funding Source: UKRI
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Supramolecular hydrogels are composed of self-assembled solid networks that restrict the flow of water. lPhenylalanine is the smallest molecule reported to date to form gel networks in water, and it is of particular interest due to its crystalline gel state. Single and multi-component hydrogels of l-phenylalanine are used herein as model materials to develop an NMR-based analytical approach to gain insight into the mechanisms of supramolecular gelation. Structure and composition of the gel fibres were probed using PXRD, solid-state NMR experiments and microscopic techniques. Solution-state NMR studies probed the properties of free gelator molecules in an equilibrium with bound molecules. The dynamics of exchange at the gel/solution interfaces was investigated further using high-resolution magic angle spinning (HR-MAS) and saturation transfer difference (STD) NMR experiments. This approach allowed the identification of which additive molecules contributed in modifying the material properties.
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