as macrocycle and a secondary ammonium salt as axle. Then they partially acetylated the secondary amine, thus resulting with the decomplexation of the crown
ether and secondary ammonium, along with a relative mechanical movement at
the axle making that the conformation of the whole polymer changed from line
to ring. Through this conventional simple protection-deprotection method, they
realized the adjustment between linear and cyclic transformation reversibly,
obtaining a new type of dynamic system that could pave the way for novel stimuli
responsive polymers. From another perspective, this new synthetic strategy for
Fig. 11 Cu
2+ modulated self-entangled and disentangled conformation transformation of a crown
ether-based pseudo[1]rotaxane [25]
Fig. 12 Conformation transformation of a [1]rotaxane structure based on crown ether and
secondary ammonium [26]
4 Mechanically Self-Locked Molecules
93
ether and secondary ammonium, along with a relative mechanical movement at
the axle making that the conformation of the whole polymer changed from line
to ring. Through this conventional simple protection-deprotection method, they
realized the adjustment between linear and cyclic transformation reversibly,
obtaining a new type of dynamic system that could pave the way for novel stimuli
responsive polymers. From another perspective, this new synthetic strategy for
Fig. 11 Cu
2+ modulated self-entangled and disentangled conformation transformation of a crown
ether-based pseudo[1]rotaxane [25]
Fig. 12 Conformation transformation of a [1]rotaxane structure based on crown ether and
secondary ammonium [26]
4 Mechanically Self-Locked Molecules
93