First syntheses of cocrystallites consisting of anti-formed metal octaethylporphyrins with fullerene C60

Abstract

The first examples of crystals that contain C₆₀ with anti-formed metal complexes of octaethylporphyrin (OEP) have been obtained. In the structures of Pd^II(OEP)·C₆₀·1.5C₆H₆ and Cu^II(OEP)·C₆₀·2C₆H₆, four ethyl groups of the metal octaethylporphyrin portions lie on one side and the other four on the opposite side of the porphyrin plane toward the C₆₀. The fullerene is peculiarly positioned in its closest approach to the metal atom, involving the 5∶6 ring junctions. There is the possibility of a strong interaction between the metal octaethylporphyrin and C₆₀. On the other hand, syn-formed metal octaethylporphyrins are observed in the cases of Ru^II(CO)(OEP)·C₆₀·2C₆H₅CH₃ and 2Zn^II(OEP)· C₆₀·2C₆H₆, suggesting that there is a face-to-face interaction between two adjacent octaethylporphyrins. The intermolecular interactions of the anti- and syn-formed metal octaethylporphyrins in the cocrystallites containing C₆₀ are also described.