Fig. 2. (a) Structures of macrocycle TTFC8 and ammonium axle 3. (b) Schematic representation of the association between ammonium axle 3 and macrocycle TTFC8 and the axle expulsion induced by double oxidation of the macrocycle. Stacked partial 1H NMR spectra (400 MHz, 2 mM, CD2Cl2, 298 K) of (c) ammonium axle 3, (d) pseudo[2]rotaxane 3@TTFC8 and (e) after oxidation by two equiv. of Fe(ClO4)3 and addition of 5 equiv. tetrabutylammonium BArF24 as stabilising electrolyte.
