bola-Type Ala–Ala Dipeptides: Odd–Even Effect in Molecular Packing Structures
Source abstract
Abstract
A series of bola-type Ala–Ala dipeptides with different alkylene bridges (n = 10–15) were synthesized. In methanol, the molecules with even-numbered carbon bridges self-assembled into twisted nanoribbons, while those with odd-numbered carbon bridges self-assembled into straight belts. The morphology displays a pronounced odd–even dependence upon the number of carbons (n) in the connecting alkylene bridge. The circular dichroism spectra of the self-assemblies showed that molecules with even- and odd-numbered carbon bridges stacked in different structures. FT-IR spectra indicated that the dipeptides with even-numbered carbon bridges formed hydrogen bonds between the amide group and carboxyl ester group, while those with odd-numbered carbon bridges formed hydrogen bonds only between the amide groups. X-ray diffraction patterns revealed that molecules with odd- and even-numbered carbon bridges stacked in monoclinic and triclinic structures, respectively.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Supramolecular Self-Assembly in Materials · Polydiacetylene-based materials and applications · Luminescence and Fluorescent Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
College of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, P. R. China
Funding
Government of Jiangsu Province · National Natural Science Foundation of China
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