Tashiro, K, Katayama, K, Tamaki, K, Pesce, L, Shimizu, N, Takagi, H, Haruki, R, Hollamby, MJ, Pavan, GM and Yagai, S (2021) Non-uniform Photoinduced Unfolding of Supramolecular Polymers Leading to Topological Block Nanofibers. Angewandte Chemie International Edition, 60 (52). pp. 26986-26993. ISSN 1433-7851

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Synthesis of one-dimensional nanofibers with distinct topological (higher-order structural) domains in the same main chain is one of the challenging topics in modern supramolecular polymer chemistry. Non-uniform structural transformation of supramolecular polymer chains by external stimuli may enable preparation of such nanofibers. To demonstrate feasibility of this post-polymerization strategy, we prepared a photoresponsive helically folded supramolecular polymers from a barbiturate monomer containing an azobenzene-embedded rigid pi-conjugated scaffold. In contrast to previous helically folded supramolecular polymers composed of a more flexible azobenzene monomer, UV-light induced unfolding of the newly prepared helically folded supramolecular polymers occurred nonuniformly, affording topological block copolymers consisting of folded and unfolded domains. The formation of such blocky copolymers indicates that the photoinduced unfolding of the helically folded structures initiates from relatively flexible parts such as termini or defects. Spontaneous refolding of the unfolded domains was observed after visible-light irradiation followed by aging to restore fully folded structures.

Item Type: Article
Additional Information: The final version of this article is available as Gold Open Access, and all relevant information related to is, including copyrights, can be found online at; https://onlinelibrary.wiley.com/doi/10.1002/anie.202110224
Uncontrolled Keywords: azobenzene; barbituric acid; co-polymer; supramolecular polymer; topological transition
Subjects: Q Science > Q Science (General)
Q Science > QE Geology
Divisions: Faculty of Natural Sciences > School of Geography, Geology and the Environment
Related URLs:
Depositing User: Symplectic
Date Deposited: 20 Oct 2021 08:16
Last Modified: 14 Feb 2022 14:55
URI: https://eprints.keele.ac.uk/id/eprint/10166

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