Single crystals of mechanically entwined helical covalent polymers

Hu, Yiming; Teat, Simon J.; Gong, Wei; Zhou, Zhou; Jin, Yinghua; Chen, Hongxuan; Wu, Jingyi; Cui, Yong; Jiang, Tao; Cheng, Xinbin; Zhang, Wei

doi:10.1038/s41557-021-00686-2

Single crystals of mechanically entwined helical covalent polymers

Journal Article · Mon May 03 00:00:00 EDT 2021 · Nature Chemistry

DOI:https://doi.org/10.1038/s41557-021-00686-2· OSTI ID:1838432

^[1]; ^[2]; ^[3]; Zhou, Zhou ^[4]; Jin, Yinghua ^[1]; Chen, Hongxuan ^[1]; Wu, Jingyi ^[1]; ^[3]; ^[4]; Cheng, Xinbin ^[4]; ^[1]

Univ. of Colorado, Boulder, CO (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Shanghai Jiao Tong Univ. (China)
Tongji Univ., Shanghai (China)

Double helical conformation of polymer chains is widely observed in biomacromolecules and plays an essential role in exerting their biological functions, such as molecular recognition and information storage. It has remained challenging, however, to prepare synthetic helical polymers, and those that exist have mainly been limited to single-stranded polymers or short oligomeric double helices. In this work, we report the synthesis of covalent helical polymers, with a high molecular weight, from the achiral monomer hexahydroxytriphenylene through to spiroborate formation. Polymerization and crystallization occurred simultaneously under solvothermal conditions to form single crystals of the resulting helical covalent polymers. Characterization by single-crystal X-ray diffraction showed that each crystal consisted of pairs of mechanically entwined polymers. No strong non-covalent interactions were observed between the two helical polymers that formed a pair; instead, each strand interacted with neighbouring pairs through hydrogen bonding. Each individual crystal was made up of helical polymers of the same handedness, but the crystallization process produced a racemic conglomerate, with equal amounts of right-handed and left-handed crystals.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: China Postdoctoral Science Foundation; Key Project of Basic Research of Shanghai; National Natural Science Foundation of China (NSFC); National Science Foundation of China; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1838432

Journal Information:: Nature Chemistry, Journal Name: Nature Chemistry Journal Issue: 7 Vol. 13; ISSN 1755-4330

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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