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Treatment of an open-cage fullerene, designated as MMK-9, with (Ph 3 P) 4 Pt in toluene solution at room temperature allows a (PPh 3 ) 2 Pt unit to be incorporated into the rim of the cage so that it becomes an integral part of the carbon cage skeleton. The structure of the adduct has been determined by single crystal X-ray diffraction and reveals that the platinum atom has planar PtC 2 P 2 coordination, rather than the usual η 2 -bonding to an intact C–C double bond of the fullerene. 

Cocrystallization of Ni II (OEP) (where OEP is the dianion of octaethylporphyrin) with C 70 in p -xylene produces black plates of 12Ni II (OEP)·12C 70 ·18 p -xylene ( 1 ). Single crystal X-ray diffraction at 90 K reveals that the crystal contains 42 individual, well-ordered molecules in the asymmetric unit with distinctive interactions between each Ni II (OEP)/C 70 pair and each pair of neighboring C 70 molecules. Warming the crystal to 186 K produces a phase change so that only four Ni II (OEP)/C 70 sites and six p -xylene molecules are present. Under the same conditions Cu II (OEP) cocrystallizes with C 70 to form Cu II (OEP)·C 70 ·1.5 p -xylene ( 2 ) with a much simpler structure consisting of one molecule of the porphyrin and the fullerene along with 1.5 molecules of p -xylene in the asymmetric unit. Crystallization of C 70 from toluene in the presence of Ni II (etioporphyrin-I) produces the black solvate 6C 70 ·6toluene ( 3 ). It seems that C 70 has a tendency to crystallize so that several orientations of the oblong molecule are present in the solid.