Permanent Dye Encapsulation Inside Rotaxanes

Permanent encapsulation eliminates any ambiguity due to partial dissociation of the dye from the host. The most common strategy for trapping a dye inside a container molecule 

9 showed that the surrounding )3-CD completely prevented the photodimerization process, but it only slowed the rate of photooxidation by about an order of magnitude. Thus, the chanical protection provided by the surrounding CD is diminished when the reactant is sterically small like molecular oxygen. 

the structure of the surrounding macrocycle is a molecular design parameter that can be used to non-covalently fine-tune the photophysical properties of the encapsn-lated dye. 

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