Supramolecular Interactions between C₆₀ and a Zirconium Bisporphyrinate Double-decker Complex

Supramolecular interactions between C60 and a zirconium bisporphyrinate double-decker complex were investigated in their co-crystal and solution. In the co-crystal, concave-convex interaction between C60 and the complex plays the role for their association, while another type of C60/porphyrin interaction together with C60/C60 interaction coexists. 13C NMR spectroscopy on mixtures of C60 with the zirconium double-decker complex or the porphyrin ligand of that complex suggests that the affinity of the double-decker complex toward C60 is higher than that of the corresponding ligand.