Alignment of twisted nanoribbons formed by C17H35CO-Val-Ala sodium saltsElectronic supplementary information (ESI) available: Pictures of hydrogels, lipodipeptide gelation properties, partial enlarged CD spectra, FT-IR and 1H NMR spectra along with SAXRD and WAXRD patterns of (d,d)-14 and (l,l)-14. See DOI: 10.1039/c8sm00909k

C 17 H 35 CO- l -Val- l -Ala and C 17 H 35 CO- d -Val- d -Ala sodium salts can form physical gels in water, and self-assemble into right- and left-handed twisted nanoribbons, respectively. FT-IR and 1 H NMR spectra indicate that the H-bonding between the neighboring valine residues and electrostatic...

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Main Authors: Tong, Qiyun, Zhang, Lianglin, Li, Yi, Li, Baozong, Yang, Yonggang
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Summary:C 17 H 35 CO- l -Val- l -Ala and C 17 H 35 CO- d -Val- d -Ala sodium salts can form physical gels in water, and self-assemble into right- and left-handed twisted nanoribbons, respectively. FT-IR and 1 H NMR spectra indicate that the H-bonding between the neighboring valine residues and electrostatic interactions of carboxylate groups play important roles in the formation of helical nanoribbons. Circular dichroism characterization and theoretical chemical calculations indicate that the dipeptide segments pack in a helical manner. X-ray diffraction patterns and theoretical chemical simulations indicate an interdigitated bilayer structure. The hydrogels exhibit a thixotropic behavior. The twisted nanoribbons are able to align under directional force. Twisted nanoribbons formed by the lipodipeptide sodium salts can be aligned in a parallel fashion under directional force.
ISSN:1744-683X
1744-6848
DOI:10.1039/c8sm00909k