Hydrogels formed from Fmoc amino acids

Emily R. Draper, Kyle L. Morris, Marc A. Little, Jaclyn Raeburn, Catherine Coulquhoun, Emily R. Cross, Tom O. McDonald, Louise C. Serpell, Dave J. Adams*

*Corresponding author for this work

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

A number of Fmoc amino acids can be effective low molecular weight hydrogelators. The type of gel formed depends on the amino acid used and, in the case of FmocF, the final pH of the system. The single crystal structure of two of the gelators (FmocF and FmocY) have been determined and the data compared to the fibre X-ray diffraction data. FmocF, which forms metastable gels, crystallises easily and the data for the fibre phase and crystal phase are relatively similar. For FmocF, the fibre axis in b is consistent with the hydrogen bonding repeat distances and the diffraction pattern calculated from the single crystal structure is a good match with the experimental fibre X-ray diffraction data. On the other hand, there are significant differences between the crystalline phase determined and the fibre phase for FmocY. The packing of FmocY within the crystal structure is created by interactions between the planar Fmoc groups, whilst it is clear that hydrogen bonding drives the self-assembly into fibrillar structures within the gels. This shows that understanding the packing in gel phase by analogy to isolated crystal structures has the potential to lead to erroneous conclusions.
Original languageEnglish
Pages (from-to)8047-8057
JournalCrystEngComm
Volume17
Issue number42
DOIs
Publication statusPublished - 11 Jun 2015
Externally publishedYes

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