Processive Rotaxane Systems. Studies on the Mechanism and Control of the Threading Process

The threading behavior of a zinc analogue of a previously reported processive manganese
porphyrin catalyst onto a series of polymers of different lengths is reported. It is demonstrated that the
speed of the threading process is determined by the opening of the cavity of the toroidal porphyrin host,
which can be tuned with the help of axial ligands that coordinate to the metal center in the porphyrin.