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. 2014 Oct 22;4(1):18–21. doi: 10.1002/open.201402073

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© 2014 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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Room temperature EPR spectra of rotaxane 1 H⋅3 PF₆ (0.15 mm) before (A) and after sequential addition of 2 equiv iPr₂EtN (B) and CF₃COOH (C). Right inset: enlargement of spectrum B showing exchange lines. Left inset: co-conformations (%) showing spin-exchange as function of sequential acid–base additions.