Abstract
An optically active acylhydrazine-functionalized biphenyl (AHB) bearing L-alanine-derived oligoamide side chains with tris(alkoxy)phenyl residues at the periphery supramolecularly coassembles with its achiral AHB to form a one-dimensional helical nanofiber, in which intermolecular hydrogen bonding between the chiral/achiral oligoamide pendant units result in modest chiral amplification (the sergeants-and-soldiers effect). The chiral and achiral AHBs copolymerize with 2,6-pyridinedicarboxaldehyde to form preferred-handed helical copolymers with amplification of the helical sense excess driven by intramolecular hydrogen bonds.
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Acknowledgements
This study was supported in part by JSPS KAKENHI (Grant-in-Aid for Specially Promoted Research, No. 18H05209 (EY and TI)). SK would like to acknowledge support from a JSPS Research Fellowship for Young Scientists (No. 19J12012).
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NO conceived the idea. TI directed the project and designed the experiments. EY directed the project and supervised the research. SK principally performed the experiments. SK and SO conducted the NMR and SEC experiments. TI, NO, and EY performed data analysis. TI and EY cowrote the manuscript. All authors discussed the results and edited the manuscript.
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Ikai, T., Kawabata, S., Okuda, S. et al. Chiral amplification of supramolecular coassemblies of chiral and achiral acylhydrazine-functionalized biphenyls and their copolymers. Polym J 53, 1475–1480 (2021). https://doi.org/10.1038/s41428-021-00550-7
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DOI: https://doi.org/10.1038/s41428-021-00550-7