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. 2018 Feb 2;7(2):169–179. doi: 10.1002/open.201700181

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© 2018 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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a) The chemically driven contraction/extension of the rotaxane dimer 13H₂ ⁴⁺/13 ²⁺, characterized by a [c2]daisy‐chain topology.54 b, c) Cartoon representation of a main chain (b) and a branched (c) polymer incorporating daisy chain molecular muscle elements.51.