Figure 4.

Caterpillar track motion in c-P8⋅(T6)₂, as revealed by ¹H NMR EXSY experiments. a) Detailed molecular structure. b) Mechanism leading to a concerted 60° rotation of both template units, transforming environments a and c into b/m and d/l. The time constant for this 60° rotation is 7.7 s. According to this mechanism, both template units must rotate in the same direction, but the direction of rotation is arbitrary, and subsequent 60° rotation steps could occur in either direction with equal probability.