Fig. 6 Conformation transformation of crown ether- and viologen-based pseudo[1]rotaxane upon
the addition of acid or base [18]
Fig. 7 Schematic illustration of the conformation stable [1]rotaxane and its optical properties
(increase of fluorescence) upon the addition of Li
+ [19]
Fig. 8 Conformation transformation of molecular motor based on crown ether upon the addition of
acid or base [20]
4 Mechanically Self-Locked Molecules
89