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1.D.172.  The Acyclic αγα-Tripeptide with Fluorinated-Furanoid Sugar Framework (ATFFF) Family 

Acyclic αγα-tripeptides derived from fluorinated-furanoid sugar amino acid frameworks act as reverse-turn inducers with a U-shaped conformation, whereas the corresponding nonfluorinated αγα-tripeptides show random peptide conformations (Roy et al. 2015). NMR studies showed the presence of bifurcated weak intramolecular hydrogen bonding (F···HN) and N+···Fδ- charge-dipole attraction compel the amide carbonyl groups to orient antiperiplanar to the C-F bond, thus, demonstrating the role of the fluorine substituent in stabilizing the U-shaped conformation. U-shaped tripeptide self-assembly is stabilized by the intermolecular hydrogen bonding between C═O···HN with antiparallel orientation. The morphological analysis by FE-SEM, on solid samples, showed arrangement of fibers into nanorods. The antiparallel self-assembled pore of the fluorinated tripeptides illustrates the selective ion-transport activity (Roy et al. 2015). These systems were reviewed by Malla et al. 2021.

References associated with 1.D.172 family:

Malla, J.A., M. Ahmad, and P. Talukdar. (2021). Molecular Self-Assembly as a Tool to Construct Transmembrane Supramolecular Ion Channels. Chem Rec. [Epub: Ahead of Print] 34766703
Roy, A., T. Saha, M.L. Gening, D.V. Titov, A.G. Gerbst, Y.E. Tsvetkov, N.E. Nifantiev, and P. Talukdar. (2015). Trimodal Control of Ion-Transport Activity on Cyclo-oligo-(1→6)-β-D-glucosamine-Based Artificial Ion-Transport Systems. Chemistry 21: 17445-17452. 26448281