Datta, S, Kato, Y, Higashiharaguchi, S, Aratsu, K, Isobe, A, Saito, T, Prabhu, DD, Kitamoto, Y, Hollamby, MJ ORCID: https://orcid.org/0000-0002-6775-3539, Smith, AJ, Dagleish, R, Mahmoudi, N, Pesce, L, Perego, C, Pavan, GM and Yagai, S (2020) Self-assembled poly-catenanes from supramolecular toroidal building blocks. Nature, 583 (7816). 400 - 405.

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Abstract

Mechanical interlocking of molecules (catenation) is a nontrivial challenge in modern synthetic chemistry and materials science1,2. One strategy to achieve catenation is the design of pre-annular molecules that are capable of both efficient cyclization and of pre-organizing another precursor to engage in subsequent interlocking3,4,5,6,7,8,9. This task is particularly difficult when the annular target is composed of a large ensemble of molecules, that is, when it is a supramolecular assembly. However, the construction of such unprecedented assemblies would enable the visualization of nontrivial nanotopologies through microscopy techniques, which would not only satisfy academic curiosity but also pave the way to the development of materials with nanotopology-derived properties. Here we report the synthesis of such a nanotopology using fibrous supramolecular assemblies with intrinsic curvature. Using a solvent-mixing strategy, we kinetically organized a molecule that can elongate into toroids with a radius of about 13 nanometres. Atomic force microscopy on the resulting nanoscale toroids revealed a high percentage of catenation, which is sufficient to yield ‘nanolympiadane’10, a nanoscale catenane composed of five interlocked toroids. Spectroscopic and theoretical studies suggested that this unusually high degree of catenation stems from the secondary nucleation of the precursor molecules around the toroids. By modifying the self-assembly protocol to promote ring closure and secondary nucleation, a maximum catenation number of 22 was confirmed by atomic force microscopy.

Item Type: Article
Additional Information: The final accepted version of this article can be found with all relevant information at the following link; https://www.nature.com/articles/s41586-020-2445-z
Uncontrolled Keywords: Interlocked molecules; Supramolecular polymers
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Q Science > QD Chemistry > QD415 Biochemistry
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 23 Jul 2020 10:30
Last Modified: 23 Jul 2020 10:30
URI: https://eprints.keele.ac.uk/id/eprint/8417

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