As a final example, we also investigate a degenerate bistable [2]Rotaxane. This consists of a dumbbell containing two naphthalene (NP) recognition sites and the tetracationic macrocycle cyclobis(paraquat-p-phenylene) (CBPQT 4+ ), the so-called "blue-box" (Fig. ). From now on, we will refer to this system as 4. In this architecture, the rigid spacer between the two recognition sites determines a simpler (more rigid-like) dynamics compared with more flexible systems. Nonetheless, a complete comprehension of the on/off mechanisms and of the internal dynamics in this system is non-trivial to attain.