Fig. 9: Effect of the supramolecular confinement of CB[8] on the ligand conformations after photodimerization.

The confinement effect of CB[8] in U-CB[8]-MPyVB restrain the photodimerization-induced structural changes of photodimerization product, so the distance between methylpyridine and benzoic acid moiety at two ends of bisMPyVB is smaller than that in the traditional photodimerization product.