Double helical conformation and extreme rigidity in a rodlike polyelectrolyte

Ying Wang, Yadong He, Zhou Yu, Jianwei Gao, Stephanie ten Brinck, Maruti Hegde, Robert B. Moore, Bernd Ensing, Theo J. Dingemans, More Authors

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)
93 Downloads (Pure)


The ubiquitous biomacromolecule DNA has an axial rigidity persistence length of ~50 nm, driven by its elegant double helical structure. While double and multiple helix structures appear widely in nature, only rarely are these found in synthetic non-chiral macromolecules. Here we report a double helical conformation in the densely charged aromatic polyamide poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide) or PBDT. This double helix macromolecule represents one of the most rigid simple molecular structures known, exhibiting an extremely high axial persistence length (~1 micrometer). We present X-ray diffraction, NMR spectroscopy, and molecular dynamics (MD) simulations that reveal and confirm the double helical conformation. The discovery of this extreme rigidity in combination with high charge density gives insight into the self-assembly of molecular ionic composites with high mechanical modulus (~ 1 GPa) yet with liquid-like ion motions inside, and provides fodder for formation of other 1D-reinforced composites.
Original languageEnglish
Article number801
Number of pages8
JournalNature Communications
Issue number1
Publication statusPublished - 2019


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