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A triptycene-derived macrotricyclic host containing two dibenzo-[30]-crown-10 moieties forms stable 1:2 host-guest complexes with paraquat derivatives in both solution and the solid state, in which anion-π interactions between PF(6)(-) and the bipyridinium rings play an important role. Moreover, it was found that binding and release of the guest molecules in the complexes could be easily controlled by the addition and removal of potassium ions., (© 2011 American Chemical Society)

On the basis of formation of a 1:2 complex between the triptycene-derived bis-macrotricyclic polyether and the paraquat derivative, two novel well-defined interwoven supramolecular cages were constructed by the [3 + 2] and [4 + 2] self-assembly of the polyether and trifurcated and cross paraquat-derived subunits under millimolar concentrations, respectively.

A novel two-station [3]rotaxane molecular machine based on triptycene-derived macrotricyclic host was conveniently synthesized by the click reaction and methylation of the subsequent 1,2,3-tiazole group. The shuttle process of the [3]rotaxane molecular machine can be reversibly achieved by acid-base control.